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    CBSE Class 12 Chemistry Question Paper 2019 with Solutions

    Edited By Sumit Saini | Updated on Aug 22, 2023 03:59 PM IST | #CBSE Class 12th

    Class 12 exams hold great importance in a student’s life since it is a transition phase of their life from school to college and thereafter their professional career. Scoring well in CBSE class 12 board exam chemistry paper becomes inevitable for a student to get into a good college and thereafter get better career opportunities. One of the important aspects to score well in chemistry paper class 12 is to analyze previous year papers since CBSE asks questions on the same pattern in subsequent years. Therefore in this regard to holistically understand the crux and analyze the CBSE 12th chemistry previous year question papers with solutions for students, we have provided the analysis of chemistry papers here. Along with this, stepwise solutions of each set are given. While going through question papers, students will be able to understand which topics are repeatedly asked and which are not, hence helping them to study exam-oriented by focusing more on important topics that are repeatedly being asked in the exam. Also, check CBSE Class 12 previous year questions for all subjects.

    CBSE Class 12 Chemistry 2019 Question Paper Set-wise

    Solutions of unique questions of 15 sets of Chemistry board paper 2019 class 12 CBSE PDF solved are quite helpful. For example, solutions to all the questions in the set 56-1-1 are given and only the unique questions of set 56-1-2 and 56-1-3 are given. Practicing the Previous Year CBSE Class 12 Chemistry Question Paper 2019 not only strengthens the concepts but also helps in completing the paper on time ultimately maximizing marks in their examination. Also, check CBSE board exam papers for all available classes and subjects. For enhanced preparation, students can also utilize CBSE Class 12 chemistry sample papers.

    CBSE 12 Class 2019 Paper: 56-1-1 Chemistry


    Question 1)

    Out of NaCl and AgCl, which one shows Frenkel defect and why?










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    Question 2)

    Arrange the following in increasing order of boiling points :

    (CH_3)_3N, C_2H_5OH, C_2H_5NH_2


















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    Question 3)

    Why are medicines more effective in colloidal state?










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    Question 4)

    What is difference between an emulsion and a gel?










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    Question 5)

    Define ambidient nucleophile with an example.










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    Question 6)

    What is the basic structural difference between glucose and fructose?










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    Question 7)

    Write the products obtained after hydrolysis of lactose.










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    Question 8)

    Write balanced chemical equations for the following processes :

    1. XeF2 undergoes hydrolysis.
    2. MnO2 is heated with conc. HCl.










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    Question 9)

    Arrange the following in order of property indicated for each set :

    1. H2O, H2S, H2Se, H2Te – increasing acidic character
    2. HF, HCl, HBr, HI – decreasing bond enthalpy










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    Question 10)

    State Raoult’s law for a solution containing volatile components. Write two characteristics of the solution which obeys Raoult’s law at all concentrations.










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    Question 11)

    For a reaction

    2H_2O_2 \xrightarrow [\textup{alkaline medium}] {I^-} 2H_2O + O_2

    the proposed mechanism is as given below :

    1. H_2O_2 + I^- \rightarrow H_2O + I^-O \ (slow)
    2. H_2O_2 + I^O- \rightarrow H_2O + I^ + O_2 \ (fast)

    (i) Write rate law for the reaction

    (ii) Write the overall order of reaction.

    (iii) Out of steps a and 2, which one rate determining step?










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    Question 12)

    (i) What is the role of activated charcoal in gas mask?

    (ii) A colloidal sol is prepared by the given method in the figure.What is the charge on hydrated ferric oxide collodial particles formed in the test tube? How is the sol represented?

    (iii) How does chemisorption vary with temperature?










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    Question 13)

    An element crystallizes in fcc lattice with cell edge of 300 pm. The density of element is 10.8gcm^{-3}. Calculate the number of atoms in 108g of the element.










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    Question 14)

    (a) Name the method of refining which is

    (i) used to obtain semiconductor of high purity

    (ii) used to obtain low boiling point

    (b) Write chemical reactions taking place in the extraction of copper from Cu_{2}S.










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    Question 15)

    Give reasons for the following:

    (i) Transition elements and their compounds act as catalysts.

    (ii) E^{\circ} value for \left ( Mn^{2+}/Mn \right ) is negative whereas for \left ( Cu^{2+}/Cu \right ) is positive.

    (iii) Actinoids shows irregularities in their electronic confriguration.










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    Question 16)

    Write the structures of monomers used for getting the following polymers:

    (i) Nylon - 6,6

    (ii) Glyptal

    (iii) Buna - S










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    Question 17)

    (i) Is a homopolymer or copolymer?Give reasons.

    (ii) Write monomers of the following polymers:

    (iii) What is the role of Sulphur in vulcanization of rubber?










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    Question 18)

    (i) What type of drug is used in sleeping pills?

    (ii) What type of detergents are used in toothpaste?

    (iii) Why the use of alitame as artificial sweetner is not recommended?










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    Question 19)

    Define the following terms with a suitable example in each:

    (i) Broad - spectrum antibiotics

    (ii) Disinfectants

    (iii) Cationic detergents










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    Question 20)

    (i) Out of (CH_{3})_{3}C-Br and (CH_{3})_{3}C-I, which one is more reactive towards S_{N}1 and why?

    (ii) Write the product formed when p-nitrochlorobenzene is heated with aqueous NaOH at 443K followed by acidification?

    (iii) Why dextro and laevo - rotatory isomers of butan - 2-ol are difficult to seprate by fractional distillation?










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    Question 21)

    An aromatic compound 'A' on heating with Br_{2} and KOH forms compound 'B' of molecular formula C_{6}H_{7}N which on reacting with CHCl_{3} and alcoholic KOH produces a foul smelling compound 'C'. Write the structures and IUPAC names of compound A,B and C.










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    Question 22)

    (i) \overset{NaCN/HCl}{\rightarrow}

    (ii) \left ( C_{6}H_{5}CH_{2} \right )_{2}Cd+2CH_{3}COCl\rightarrow

    (iii) \xrightarrow[(ii)H_{2}O]{(i) Br_{2}/Red P_{4}}










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    Question 23)

    Write chemical equations for the following reactions:

    (i) Propane is treated with dilute Ba(OH)_{2}.

    (ii) Acetophenone is treated with Zn(Hg)/Conc. HCl.

    (iii) Benzoyl chloride is hydrogenated in presence of Pd/BaSO_{4}.










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    Question 24)

    Differentiate between the following:

    (i) Amylose and Amylopectin

    (ii) Peptide linkage and Glycosidic linkage

    (iii) Fibrous proteins and Globular proteins










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    Question 25)

    Write chemical reactions to show that open structure D-glucose contains the following:

    (i) Straight chain

    (ii) Five alcohol groups

    (iii) Aldehyde as carbonyl group










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    Question 26)

    E^{\circ}_{cell} for the given redox reaction is 2.71 V.

    Mg(s)+Cu^{2+}_{\left (0.01M \right )}\rightarrow Mg^{2+}_{\left ( 0.001M \right )}+Cu(s)

    Calculate E_{cell} for the reaction. Write the direction of flow of current when external opposite potential is applied us:

    (i) less than 2.71V

    (ii) greater than 2.71V










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    Question 27)

    (a) Steady current of 2 amperes was passed through two electrolytic cells X and Y connected in series containing electrolytes FeSO_{4} and ZnSO_{4} untill 2.8g of Fe deposited at the cathode of cell X. How long did the current flow? Calculate the mass Zn deposited at the cathode of cell Y.

    (molar mass : Fe = 56 g mol-1, Zn = 65.3 g mol-1, 1F = 96500C mol-1)

    (b) In the plot of molar conductivity(\wedge _{m}) vs square root concentration (c^{\frac{1}{2}}), following curves are obtained for two electrolytes A and B:

    Answer the following:

    (i) Predict the nature of electrolyte A and B.

    (ii) What happens on extrapolation of \wedge _{m} to concentration approaching zero for electrolytes A and B?










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    Question 28)

    (a) How do you convert the following:

    (i) Phenol to anisole

    (ii)Ethanol to Propan-2-ol

    (b)write the mechanism of the following reacion:

    C_{2}H_{2}OH\xrightarrow[443K]{H_{2}SO_{4}}CH_{2}=CH_{2}+H_{2}O

    (c)Why phenol undergoes electrophilic substitution reaction more easly than benzene?










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    Question 29)

    (a) Account for the following:

    (i) o-nitophenol is more steam volatile than p-nitrophenol.

    (ii) t-butyl chloride on heating eith sodium methoxide gives 2-methylpropene instead of t-butylmethylether.

    (b) Write the reaction involved in the following:

    (i) Reimer - Tiemann Reaction

    (ii) Friedal - Crafts Alkylation Of Phenol

    (c) Give simple test to distinguish between Ethanol and Phenol.










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    Question 30)

    (a) Given reasons for the following:

    (i) Sulphur in vapour state shows paramagnetic behaviour.

    (ii) N-N bond is weaker than P-P bond.

    (iii) Ozone iss thermodynamically less stable than oxygen.

    (b) Write the names of gas relased when CU is added to

    (i) dilute HNO3 and

    (ii) conc. HNO3










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    Question 31)

    When MnO2 is fused with KOH in the presence of KNO3 as an oxidizing agent, it gives a dark green compound (A). Compound (A) disproportionates in an acidic solution to give a purple compound (B). An alkaline solution of compound (B) oxidizes KI to compound (C) whereas an acidified solution of compound (B) oxidizes KI to (D). Identify (A), (B), (C), and (D).










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    Question 32)

    Write the IUPAC name of the complex [Pt(en)_2Cl_2]. Draw structures of geometrical isomers for this complex.










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    Question 33)

    Using IUPAC norms write the formulae for the following :

    1. Hexaamminecobalt(III) sulphate
    2. Potassium trioxalatochromate(III)










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    Question 34)

    Out of [CoF_6]^{3-} and [Co(en)_3]^{3+}, which one complex is

    1. paramagnetic
    2. more stable
    3. inner orbital complex and
    4. high spin complex

    (Atomic no. of Co = 27)










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    Question 35)

    (a) (i) Write the disproportionation reaction of H_{3}PO_{3}.

    (ii) Draw the structure of XeF_{4}

    (b) Account for the following:

    (i) Although Fluorine has less negative electtron gain enthalpy yet F2 is styrong oxidizing agent.

    (ii) Acidic character decreases from N2O3 to Bi2O3 in group 15.

    (c) Write a chemical reaction to test sulphur dioxide gas. Write chemical eqaution involved.











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    Question 36)

    Write structures of compounds A and B in each of the following reactions :


















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    Question 37)

    The decomposition of NH 3 on a platinum surface is zero order reaction. If rate constant (k) is 4\times 10^{-3}Ms^{-1}, how long will it take to reduce the initial concentration of NH 3 from 0.1 M to 0.064 M.










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    Question 38)

    A 4% solution (w/w) of sucrose (M = 342 g mol-1) in water has freezing point of 271.15K. Calculate the freezing point of 5% glucose (M = 180 g mol^{-1}) in water.

    (Given: Frezzing point of water = 273.15K)










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    CBSE 12 Class 2019 Paper: 56-1-2 Chemistry

    Question 1)

    Why conductivity of silicon increases on doping with phosphorus ?










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    Question 2)

    Write IUPAC name of the given compound :










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    Question 3)

    Write two differences between an ideal solution and a non-ideal solution.










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    Question 4)

    Write IUPAC name of the complex \left [ Cr(NH_{3})_{4}Cl_{2} \right ]^{+}. Draw structures of geometrical isomers for this complex.










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    Question 5)

    Using IUPAC norms write the formulae for the following :

    (i) Pentaamminenitrito-O-cobalt (III) chloride

    (ii) Potassium tetracyanidonickelate (II)










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    Question 6)

    (i) Write the role of 'CO' in the purification of nickel.

    (ii) What is the role of silica in the extraction of copper ?

    (iii) What type of metals are generally extracted by electrolytic method ?










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    Question 7)

    Give reasons for the following :

    (i) Transition metals form alloys.

    (ii) Mn_{2}O_{3} is basic whereas Mn_{2}O_{7} is acidic.

    (iii) Eu^{2+} is a strong reducing agent.










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    Question 8)

    (i) Why bithional is added in soap ?

    (ii) Why magnesium hydroxide is a better antacid than sodium bicarbonate ?

    (iii) Why soaps are biodegradable whereas detergents are non-biodegradable ?










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    Question 9)

    Define the following terms with a suitable example in each :

    (i) Antibiotics

    (ii) Artificial sweeteners

    (iii) Analgesics










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    Question 10)

    Write the structures of main products when benzene diazonium chloride reacts with the following reagents :

    (i) CuCN

    (ii) CH_{3}CH_{2}OH

    (iii) KI










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    CBSE 12 Class 2019 Paper: 56-1-3 Chemistry

    Question 1)

    What type of stoichiometric defect is shown by ZnS and why?










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    Question 2)

    Write one stereochemical difference between S_{N}1 and S_{N}2 reactions.










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    Question 3)

    State Henry's law and write its two application










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    Question 4)

    Write the hybridization and magnetic character of the following complexes:

    (i) \left [ Fe\left ( H_{2}O \right )_{6} \right ]^{2+}

    (ii) \left [ Fe\left (CO \right )_{5} \right ]

    (Atomic number of Fe = 26)










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    Question 5)

    Write the structures of main componds A and B in each of the following reactions:

    (i)

    (ii)


















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    Question 6)

    How will you convert the following:

    (i) Impure Nickel to pure Nickel

    (ii) Zinc blende to Zinc metal

    (iii) \left [Ag(CN)_{2} \right ]^{-} to Ag










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    Question 7)

    Given reasons for the following:

    (i) The transition metals generally form coloured compounds.

    (ii) E^{\circ} value for \left ( Mn^{3+}/Mn^{2+} \right ) is highly positive than that for \left ( Cr^{3+}/Cr^{2+} \right ) couple.

    (iii) The chemistry of actinoids elements is not so smooth as that of the lanthanoids.










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    Question 8)

    Write equations to the following reactions:

    (i) Acetylation of aniline

    (ii) Coupling reaction

    (iii) Carbyl amine reaction










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    Question 9)

    Define the following with a suitable examole in each:

    (i) Oligosaccharides

    (ii) Denaturation of protein

    (iii) Vitamins










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    Question 10)

    Write the reaction involved when D-glucose is treated with the following reagents:

    (i) Br_{2} water

    (ii) H_{2}N-OH

    (iii) (CH_{3}CO)_{2}O










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    CBSE 12 Class 2019 Paper: 56-2-1 Chemistry

    Question 1)

    Out of KCl and AgCl, which one shows Schottky defect and why?

    OR

    Why does ZnO apear yellow on heating?










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    Question 2)

    Arrange the following in decreasing order of basic character :

    C_6H_5NH_2,\: \left ( CH_3 \right )_3N,\: \: \: C_2H_5NH_2










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    Question 3)

    What type of colloid is formed when a solid is dispersed in a liquid? Give an example.










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    Question 4)

    Out of Chlorobenzene and Cyclohexyl chloride, which one is more reactive towards nucleophilic substitution reaction and why?










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    Question 5)

    What is the basic structural difference between starch and cellulose?

    OR

    Write the products obtained after hydrolysis of DNA.











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    Question 6)

    Write balanced chemical equations for the following processes :

    (a) Cl_2 is passed throug slaked lime.

    (b) SO_2 gas is passed through an aqueous solution of Fe(III) salt.











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    Question 7)

    Give reasons :

    (a) Cooking is faster in pressure cooker than in cooking pan.

    (b) Red Blood Cells (RBC) shrink when placed in saline water but swell in distilled water.











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    Question 8)

    Define order of reaction. Predict the order of reaction in the given grahs :

    (a)


    (b)


    where [R]_o is the initial concentration of reactant and t_{1/2} is half-life.










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    Question 9)

    (a) Write two poisonous gases prepared from chlorine gas.

    (b) Why does Cu^{2+} solution give blue colour on reaction with ammonia ?










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    Question 10)

    When FeCr_2O_4 is fused with Na_2CO_3 in the presence of air it gives a yellow solution of compound(A). Compound (A) on acidification gives comound (B). Compound (B) on reaction with KCl forms an orange coloured compound (C). An acidified solution of comound (C) oxidises Na_2SO_3 to (D). Identify (A), (B), (C) and (D).











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    Question 11)

    Write IUPAC name of the complex \left [ Co(en)_2(NO_2)Cl \right ]^+. What type of structural isomerism is shownby this complex?











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    Question 12)

    Using IUPAC norms, write the formulae for the following complexes:

    (a) Hexaaquachromium(III)chloride

    (b) Sodium trioxalatoferrate(III)










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    Question 13)

    (a) Although both \left [ NiCl_4 \right ]^{2-}\: and\: \left [ Ni\left ( CO \right )_4 \right ] have sp^{3} hybridisation yet \left [ NiCl_4 \right ]^{2-} is paramagnetic and \left [ Ni \right (CO)_4] is diamagnetic. Give reason. (Atomic no. of Ni = 28)


    (b) Write the electronic configuration of d^{5} on the basis of crystal field theory when

    (i) \Delta _{0}<P\: \: \: and

    (ii) \Delta _{0}>P










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    Question 14)

    Write structures of main compounds A and B in each of the following reactions:

    (a)\: C_6H_5COOH\overset{PCl_5}{\rightarrow}A\overset{H_2/Pd-BaSO_4}{\rightarrow}B

    (b)\: CH_3CN\xrightarrow[(ii)H_3O^+]{(i)CH_3MgBr}A\overset{Zn(Hg)/conc. HCl}{\rightarrow}B











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    Question 15)

    The following data were obtained for the reaction :

    A+2B\rightarrow C

    Experiment[A]/M[B]/MInitial rate of formation of C/M min-1
    10.20.34.2\times 10^{-2}
    20.10.16.0\times 10^{-3}
    30.40.31.68\times 10^{-1}
    40.10.42.40\times 10^{-2}

    (a) Find the order of reaction with respect to A and B.

    (b) Write the rate law and overall order of reaction.

    (c) Calculate the rate constant (k).











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    Question 16)

    (a) Write the dispersed phase and dispersion medium of dust.

    (b) Why is physisortion reversible whereas chemisorption is irreversible?

    (c) A colloidal sol is prepared by the method given in the figure. What is the charge on AgI colloidal particles in the test tube? How is this sol represented?










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    Question 17)

    An element X with an atomic mass of 81u has density 10.2gcm^{-3}. If the volume of unit cell is 2.7\times10^{-23}cm^3, identify the type of cubic unit cell.

    \left ( Given:N_A=6.022\times10^{23}mol^{-1} \right )










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    Question 18)

    A solution containing 1.9g\: \: per\: \: 100mL\: \: of\: \: KCl\left ( M=74.5gmol^{-1} \right ) is isotonic with a solution containing 3g\: per\: 100mL\: \: of\: \: urea\left ( M=60gmol^{-1} \right ). Calculate the degree of dissociation of KCl solution. Assume that both the solutions have same temperature.











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    Question 19)

    Write the name and principle of the method used for refining of (a) Zinc, (b) Germanium, (c) Titanium.










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    Question 20)

    Give reasons for the following :

    (a) Transition metals form complex compounds.

    (b) E^0 values for \left ( Zn^{2+}/Zn \right )\: \: and\: \: \left ( Mn^{2+}/Mn \right ) are more negative than expected.

    (c) Actinoids show wide range of oxidation states.











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    Question 21)

    Write the structures of monomers used for getting the following polymers :

    (a) Nylon-6

    (b) Terylene

    (c) Buna-N










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    Question 22)

    (a) Is a homopolymer or copolymer? Give reason.

    (b) Write the monomers of the following polymer:

    (c) Write the role of benzoyl peroxide in polymerisation of ethene.











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    Question 23)

    (a) Pick out the odd one from the following on the basis of their medicinal properties:

    Equanil, Seconal , Bithional, Luminal

    (b) What type of detergents are used in dishwashing liquids?

    (c) Why is the use of aspartame limited to cold foods?











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    Question 24)

    Define the following terms with a suitable example of each:

    (a) Antibiotics

    (b) Antiseptics

    (c) Anionic detergents.











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    Question 25)

    Among all the isomers of molecular formula C_4H_9Br, identify

    (a) the one isomer which is optically active.

    (b) the one isomer which is highly reactive towards S_N2.

    (c) the two isomers which give same product on dehydrohalogenation with alcoholic KOH.










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    Question 26)

    Complete the following reactions :

    (a) \xrightarrow[]{H_2/Ni}



    (b) \xrightarrow[]{H_3PO_2+H_2O}



    (c) +CHCl_3 \xrightarrow[]{Ethanolic\: KOH}










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    Question 27)

    How do you convert the following :

    (a) N-phenylethanamide to p-bromoaniline

    (b) Benzene diazonium chloride to nitrobenzene

    (c) Benzoic acid to aniline










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    Question 28)

    (a) Give reasons :

    (i) Benzoic zcid is a stronger acid than acetic acid.

    (ii) Methanal is more reactive towards nucleophilic addition reaction than ethanal.

    (b) Give a simple chemical test to distinguish between propanal and propanone.











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    Question 29)

    (a) What are the products of hydrolysis of maltose?

    (b) What type of bonding provides stability to \alpha -helix structure of protein?

    (c) Name the vitamin whose deficiency causes pernicious anaemia.











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    Question 30)

    Define the following terms :

    (a) Invert sugar

    (b) Native protein

    (c) Nucleotide











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    Question 31)

    (a) The conductivity of 0.001molL^{-1} acetic acid is 4.95\times 10^{-5}Scm^{-1}. Calculate the dissociation constant if \wedge _{m}^{o} for acetic acid is 390.5Scm^2mol^{-1}.

    (b) Write Nernst equation for the reaction at 25^{\circ}C:

    2Al(s)+3Cu^{2+}(aq)\rightarrow \rightarrow 2Al^{3+}(aq)+3Cu(s)

    (c) What are secondary batteries? Give an example.











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    Question 32)

    (a) Represent the cell in which the following reaction takes place :

    2Al(s)+3Ni^{2+}(0.1M)\rightarrow 2Al^{3+}(0.01M)+3Ni(s)

    Calculate its emf if E_{cell}^{o}=1.41V.

    (b) How does molar conductivity vary with increase in concentration for strong electrolyte and weak electrolyte? How can you obtain limiting molar conductivity \wedge _{m}^{o} for weak electrolyte?










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    Question 33)

    (a) Give equations of the following reactions:

    (i) Phenol is treated with conc.HNO_3.

    (ii) Propene is treated with B_2H_6 followed by H_2O_2/OH^-.

    (iii) Sodium t-butoxide is treated with CH_3Cl.

    (b) How will you distinguish between butan-1-ol and butan-2-ol ?

    (c) Arrange the following in increasing order of acidity :

    Phenol, ethanol, water










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    Question 34)

    (a) How can you obtain Phenol from (i) Cumene, (ii) Benzene sulphonic acid, (iii) Benzene diazonium chloride?

    (b) Write the structure of the major product obtained from dinitration of 3-methylphenol.

    (c) Write the reaction involved in Kolbe's reaction.











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    Question 35)

    (a) Give one example to show the anomalous reaction of fluorine.

    (b) What is the structural difference between white phosphorus and red phosphorus?

    (c) What happens when XeF_6 reacts with NaF?

    (d) Why is H_2S a better reducing agent than H_2O ?

    (e) Arrange the following acids in the increasing order of their acidic character :

    HF,HCl,HBr and HI










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    Question 36)

    (a) Account for the following :

    (i) Tendency to show -3 oxidation state decreases from N to Bi in group 15.

    (ii) Acidic character increases from H_2O to H_2Te.

    (iii) F_2 is more reactive than CIF_3, whereas CIF_3, is more reactive than Cl_2.

    (b) Draw the structure of (i) XeF_2,(ii)H_4P_2O_7.












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    CBSE 12 Class 2019 Paper: 56-2-2 Chemistry

    Question 1)

    Arrange the following in increasing order of pKb values :

    C_6H_5CH_2NH_2, \ C_6H_5NHCH_3, \ C_6H_5NH_2










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    Question 2)

    What type of colloid is formed when a liquid is dispersed in a solid ? Give an example.










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    Question 3)

    Give reasons :

    1. A decrease in temperature is observed on mixing ethanol and acetone.
    2. Potassium chloride solution freezes at a lower temperature than water.










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    Question 4)

    Define the following terms with a suitable example of each :
    (a) Chelate complex
    (b) Ambidentate ligand










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    Question 5)

    Using IUPAC norms, write the formulae for the following complexes :
    (a) Tetraamminediaquacobalt(III) chloride
    (b) Dibromidobis(ethane-1,2-diamine)platinum(IV) nitrate










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    Question 6)

    (a) Using valence bond theory, write the hybridisation and magnetic character of the complex[Fe(CN)_6]^{4-}. Atomic Number of Fe = 26)

    (b) Write the electronic configuration of d 6 on the basis of crystal field theory when

    1. \Delta_0<P and
    2. \Delta_0>P










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    Question 7)

    (a) Write the dispersed phase and dispersion medium of milk.
    (b) Why is adsorption exothermic in nature?
    (c) Write Freundlich adsorption isotherm for gases at high pressure.










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    Question 8)

    Write the name and principle of the method used for refining of (a) Tin, (b) Copper, (c) Nickel.










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    Question 9)

    Give reasons for the following :

    (a) Transition metals show variable oxidation states.
    (b) Eo value for (Zn2+/Zn) is negative while that of (Cu2+/Cu) is positive.
    (c) Higher oxidation state of Mn with fluorine is +4 whereas with oxygen is +7.










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    Question 10)


    (a) Write one example each of

    (i) Thermoplastic polymer
    (ii) Elastomers

    (b) Arrange the following polymers in the increasing order of their intermolecular forces :
    Polythene, Nylon-6,6, Buna-S

    (c) Which factor provides crystalline nature to a polymer like Nylon?










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    Question 11)

    Write the structures of monomers used for getting the following polymers :

    (a) Nylon-6,6
    (b) Bakelite
    (c) Buna-S










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    CBSE 12 Class 2019 Paper: 56-2-3 Chemistry

    Question 1)

    Arrange the following in decreasing order of solubility in water :

    \left ( C_{2}H_{5} \right )_{2}NH, C_{2}H_{5}NH_{2}, C_{6}H_{5}NH_{2}










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    Question 2)

    What type of colloid is formed when a solid is dispersed in a gas? Give an example.










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    Question 3)

    What is the difference between amylose and amylopectin ?










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    Question 4)

    Give reasons :

    (a) An increase in temperature is observed on mixing chloroform and acetone.

    (b) Aquatic animals are more comfortable in cold water than in warm water.











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    Question 5)

    Define the following terms with a suitable example of each:

    (a) Polydentate ligand

    (b) Homoleptic complex










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    Question 6)

    Write structures of main compounds A and B in each of the following reactions :

    (a)

    (b) C_{6}H_{5}COCH_{3}\overset{NaOI}{\rightarrow}A+B











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    Question 7)

    (a) Write the dispersed phase and dispersion medium of butter.

    (b) Why does physisorption decrease with increase in temperature ?

    (c) A colloidal sol is prepared by the method given in the figure. What is the charge on Agl colloidal particles formed in the test tube?How is this sol represented ?










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    Question 8)

    Write the principle of the following :

    (a) Hydraulic washing

    (b) Chromatography

    (c) Froth-floatation process










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    Question 9)

    Give reasons for the following :

    (a) Transition metals have high enthalpies of atomization.

    (b) Manganese has lower melting point even though it has a higher number of unpaired electrons for bonding.

    (c) Ce^{4+} is a strong oxidising agent.










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    Question 10)

    Write the structure of monomers used for getting the following polymers:

    (a) Novolac

    (b) Neoprene

    (c) Buna-S











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    Question 11)

    (a) Write the product when D-glucose reacts with Br_{2}(aq).

    (b)What type of bonding provides stability to \alpha -helix structure of protein.

    (c) Name the vitamin whose deficiency causes pernicious anaemia.










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    Question 12)

    (a) Write one example each of

    (i) Cross-linked polymer

    (ii) Natural polymer

    (b) Arrange the following in the increasing order of their intermolecular forces:

    Terylene, Buna-N, Polystyrene

    (c) Define biodegradable polymers with an example.










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    Question 13)

    Define the following terms:

    (a) Invert sugar

    (b) Native protein

    (c) Nucleotide










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    Question 14)

    Using IUPAC norms, write the formulae for the following complexes :

    (a) Potassium tri(oxalato) chromate(III)

    (b) Hexaaquamanganese (II) sulphate










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    CBSE 12 Class 2019 Paper: 56-3-1 Chemistry

    Question 1)

    Write the IUPAC name of the following compound :










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    Question 2)

    Arrange the following in increasing order of their acidic character :

    Benzoic acid, Phenol, Cresol


















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    Question 3)

    Write IUPAC name of the complex

    \left [ Co(en)_{2}(H_{2}O)(CN) \right ]^{2+}










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    Question 4)

    Using IUPAC norms, write the formula of Ammonium tetrafluoridocobaltate (II).










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    Question 5)

    What is the difference between a glycosidic linkage and a peptide linkage ?










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    Question 6)

    What is the difference between Nucleotide and Nucleoside ?










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    Question 7)

    What happens when AgCl is doped with CdCl_{2} ? What is the name of this defect ?










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    Question 8)

    What type of defect is shown by NaCl in

    (a) stoichiometric defects, and

    (b) non-stoichiometric defects ?










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    Question 9)

    (a) Out of 0.1 molal aqueous solution of glucose and 0.1 molal aqueous solution of KCl, which one will have higher boiling point and why ?

    (b) Predict whether van’t Hoff factor,(i) is less than one or greater than one in the following :

    (i) CH_{3}COOH dissolved in water

    (ii) CH_{3}COOH dissolved in benzene










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    Question 10)

    Complete and balance the following equations :

    (a) C+H_{2}SO_{4}(Conc.)\rightarrow

    (b) XeF_{2}+PF_{5}\rightarrow










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    Question 11)

    Write balanced chemical equations involved in the following reactions :

    (a) Fluorine gas reacts with water.

    (b) Phosphine gas is absorbed in copper sulphate solution.










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    Question 12)

    Draw structures of the following :

    (a) H_{2}S_{2}O_{7}

    (b) HClO_{3}










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    Question 13)

    Write anode and cathode reactions that occur in dry cell. How does a dry cell differ from a mercury cell ?










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    Question 14)

    Account for the following :

    (a) Gabriel phthalimide synthesis is not preferred for preparing aromatic primary amines.

    (b) On reaction with benzene sulphonyl chloride, primary amine yields product soluble in alkali whereas secondary amine yields product insoluble in alkali.










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    Question 15)

    Write structures of compounds A and B in each of the following reactions :










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    Question 16)

    (a) Following reaction takes place in the cell :

    Zn(s)+Ag_{2}O(s)+H_{2}O(l)\rightarrow Zn^{2+}(aq)+2Ag(s)+2OH^{-}(aq)

    Calculate \Delta _{r}G^{\circ} of the reaction .

    [Given : E^{0}_{(Zn^{2+}/Zn)}=-0.76\; V,

    E^{0}_{(Ag^{+}/Ag)}=0.80\; V,\; 1\; F=96,500\; C\; mol^{-1}]

    (b) How can you determine limiting molar conductivity, \left (\wedge ^{\circ} _{m}\right ) for strong electrolyte and weak electrolyte ?










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    Question 17)

    Define the following with a suitable example, of each :

    (a) Coagulation

    (b) Multimolecular colloid

    (c) Gel










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    Question 18)

    (a) Out of starch and ferric hydroxide sol, which one can easily be coagulated and why?

    (b) What is observed when an emulsion is centrifuged?

    (c) What is the role of promoters and poisons in catalysis?










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    Question 19)

    (a) An element crystallizes in bcc lattice with a cell edge of 3\times 10^{-8}cm. The density of the element is 6.89\; g\; cm^{-3}. Calculate the molar mass of the element. (NA=6.022\times 10^{23}mol^{-1})

    (b) What type of semiconductor is obtained when

    (i) Ge is doped with In?

    (ii) Si is doped with P?










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    Question 20)

    A solution 0·1 M of Na_{2}SO_{4} is dissolved to the extent of 95\; ^{o}/_{o}. What would be its osmotic pressure at 27^{\circ}C ? (R=0.821\; L\; atm\; K^{-1}mol^{-1})










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    Question 21)

    Write down the reactions taking place in blast furnace related to the metallurgy of iron in the temperature range 500 K – 800 K. What is the role of limestone in the metallurgy of iron ?










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    Question 22)

    What happens when

    (a) Silver is leached with NaCN in the presence of air?

    (b) Copper matte is charged into silica lined converter and hot air blast is blown?

    (c) NaCN is added in an ore containing PbS and ZnS during concentration by froth floatation method?










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    Question 23)

    Give reasons for the following :

    (a) Dioxygen is a gas but sulphur a solid.

    (b) NO (g) released by jet airplanes is slowly depleting the ozone layer.

    (c) Interhalogens are more reactive than pure halogens










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    Question 24)

    Write the structures of monomers used to obtain the following polymers :

    (a) Neoprene

    (b) PHBV

    (c) Bakelite










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    Question 25)

    (a) Arrange the following polymers in decreasing order of their intermolecular forces: Bakelite, Polythene, Buna-S, Nylon-6,6

    (b) Write the monomers of the following polymer :

    (c) What is the structural difference between high-density polythene (HDP) and low-density polythene (LDP)?










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    Question 26)

    (a) Why are metal hydroxides better alternatives than sodium hydrogen carbonate in antacids?

    (b) Why is aspirin used in the prevention of heart-attacks?

    (c) Why antihistamines do not affect the secretion of acid in the stomach ?










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    Question 27)

    Define the following terms with a suitable example of each :

    (a) Tranquilizers

    (b) Antibiotics

    (c) Non-ionic detergents










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    Question 28)

    (a) Out of which one is more reactive towards SN2 reaction and why?

    (b) Out of which one is more reactive towards nucleophilic substitution reaction and why?

    (c) Out of which one is optically active and why?










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    Question 29)

    What happens when

    (a) Salicylic acid is treated with (CH_{3}CO)_{2}O/H^{+} ?

    (b) Phenol is oxidized with Na_{2}Cr_{2}O_{7}/H^{+} ?

    (c) Anisole is treated withCH_{3}Cl/anhydrous AlCl_{3} ?

    Write the chemical equation in support of your answer.










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    Question 30)

    (a) Give one chemical test as an evidence to show that

    \left [ CO(NH_{3})_{5}Cl \right ]SO_{4} and \left [ CO(NH_{3})_{5}(SO)_{4} \right ]Cl are ionization isomers.

    (b) \left [ NiCl_{4} \right ]^{2-} is paramagnetic while \left [ Ni(CO)_{4} \right ] is diamagnetic though both are tetrahedral. Why ? (Atomic no. ofNi=28)

    (c) Write the electronic configuration of Fe(III) on the basis of crystal field theory when it forms an octahedral complex in the presence of

    (i) strong field ligand, and

    (ii) weak field ligand. (Atomic no. of Fe=26)










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    Question 31)

    Define the following terms with a suitable example of each :

    (a) Anomers

    (b) Essential amino acids

    (c) Denaturation of protein










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    Question 32)

    (a) Define order of reaction. How does order of a reaction differ from molecularity for a complex reaction?

    (b) A first-order reaction is 50\; ^{o}/_{o} complete in 25 minutes. Calculate the time for 80\; ^{o}/_{o} completion of the reaction.










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    Question 33)

    (a) The decomposition of a hydrocarbon has value of rate constant as 2.5\times 10^{4}s^{-1} at 27^{\circ}C. At what temperature would rate constant be 7.5\times 10^{4}s^{-1} if energy of activation is 19.147\times 10^{3}\; J\; mol^{-1}?

    (b) Write a condition under which a bimolecular reaction is kinetically first order. Give an example of such a reaction.

    \left ( Given : log\; 2=0.3010,log\; 3=0.4771,log\; 5=0.6990 \right )










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    Question 34)

    (a) Predict the main product of the following reactions :

    (b) Give a simple chemical test to distinguish between

    (c) Why is alpha (\alpha ) hydrogen of carbonyl compounds acidic in nature?










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    Question 35)

    (a) Write the main product formed when propanal reacts with the following reagents :

    (i) 2 moles of CH_{3}OH in presence of dry HCl

    (ii) Dilute NaOH

    (iii) H_{2}N-NH_{2} followed by heating with KOH in ethylene glycol

    (b) Arrange the following compounds in increasing order of their property as indicated :

    (i) F-CH_{2}COOH,O_{2}N-CH_{2}COOH,CH_{3}COOH,HCOOH- — acid character

    (ii) Acetone, Acetaldehyde, Benzaldehyde, Acetophenone — reactivity towards the addition of HCN.










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    Question 36)

    (a) Account for the following :

    (i) Manganese shows maximum number of oxidation states in 3d series.

    (ii) E^{\circ} value for Mn^{3+}/Mn^{2+} couple is much more positive than that for

    Cr^{3+}/Cr^{2+} .

    (iii) Ti^{4+} is colourless whereas V^{4+} is coloured in an aqueous solution.

    (b) Write the chemical equations for the preparation of KMnO_{4} from MnO_{2}. Why does purple colour of acidified permanganate solution decolourise when it oxidises Fe^{2+} to Fe^{3+} ?










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    Question 37)

    (a) Write one difference between transition elements and p-block elements with reference to variability of oxidation states.

    (b) Why do transition metals exhibit higher enthalpies of atomization?

    (c) Name an element of lanthanoid series which is well known to shown +4 oxidation state. Is it a strong oxidising agent or reducing agent ?

    (d) What is lanthanoid contraction? Write its one consequence.

    (e) Write the ionic equation showing the oxidation of Fe(III) salt by acidified dichromate solution.










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    CBSE 12 Class 2019 Paper: 56-3-2 Chemistry

    Question 1)

    Using IUPAC norms write the formula of Hexaamminecobalt(III) sulphate.










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    Question 2)

    Why is CH_2=CH-CH_2-Cl more easily hydrolysed than CH_3-CH_2-CH_2-Cl ?










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    Question 3)

    Write the IUPAC name of the following compound:










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    Question 4)

    Arrange the following in increasing order of their boiling point:

    CH_3CH_2OH,CH_3CHO,CH_3-O-CH_3


















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    Question 5)

    Complete and balance the following equations:

    (a) S+H_2SO_4(conc.)\rightarrow

    (b) PCl_3+H_2O\rightarrow










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    Question 6)

    Write balanced chemical equations involved in the following reactions:

    (a) Chlorine gas reacts with cold and dilute NaOH.

    (b) Calcium phosphide is dissolved in water.










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    Question 7)

    Draw structures of the following:

    a) XeF_4

    b) S_2O_8^{2-}










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    Question 8)

    (a) Write the reaction that occurs at anode on electrolysis of concentrated H_2SO_4 using platinum electrodes.

    (b) What is the effect of temperature on ionic conductance?










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    Question 9)

    Write structures of compounds A and B in each of the following reactions:










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    Question 10)

    Write the structures of monomers used to obtain the following polymers:

    (a) Buna-S

    (b) Glyptal

    (c) Nylon-6










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    Question 11)

    (a) Arrange the following polymers in increasing order of their intermolecular forces:

    Polyvinylchloride, Neoprene, Terylene

    (b) Write one example each of

    (i) Natural Polymer

    (ii) Thermosetting polymer

    (c) What is the significance of numbers 6,6 in the polymer Nylon-6,6?










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    Question 12)

    (a) Which one of the following is disinfectant?

    0.2% solution of phenol or 1% solution of phenol.

    (b) What is the difference between agonists and antagonists?

    (c) Write one example each of

    (i) Artificial sweetener

    (ii) Antacids










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    Question 13)

    Define the following terms with a suitable example of each:

    (a) Antiseptics

    (b) Bactericidal antibiotics

    (c) Cationic detergents










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    CBSE 12 Class 2019 Paper: 56-3-3 Chemistry

    Question 1)

    Write the IUPAC name of the following compound:










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    Question 2)

    Write IUPAC name of the complex [Co(en)_2Cl_2]^{+}










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    Question 3)

    Arrange the following in increasing order of their acidic character:

    Ethanol, Phenol, Water










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    Question 4)

    Complete and balance the following equations :

    a)NH_3 (excess) + Cl_2\rightarrow


    b)XeF_6 + 2H_2O\rightarrow












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    Question 5)

    Write balanced chemical equations involved in the following reactions :

    1. XeF_4 reacts with SbF_5.
    2. Ag is heated with PCl_5.










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    Question 6)

    Write any two oxoacids of sulphur and draw their structures.










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    Question 7)

    Write the name of two fuels other than hydrogen used in fuel cell. Write two advantages of fuel cell over an ordinary cell.










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    Question 8)

    Give reasons for the following :

    1. Acidic character decreases from N_2O_3 to Bi_2O_3
    2. All the P – Cl bonds in PCl_5 are not equivalent.
    3. HF is a weaker acid than HCl in an aqueous solution.










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    Question 9)

    Write the structures of monomers used to obtain the following polymers :

    1. Natural rubber
    2. PVC
    3. Nylon-6,6










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    Question 10)

    Write the mechanism of free radical polymerisation of ethene.










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    Question 11)

    What happens when

    1. Sodium phenoxide is treated with CH_3Cl ?
    2. CH_2 = CH- CH_2- OH is oxidised by PCC ?
    3. Phenol is treated with CH_3COCl/anhydrous AlCl_3 ? Write chemical equations in support of your answer.











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    Question 12)

    Define the following terms with a suitable example of each :

    1. Tertiary structure of protein
    2. Essential amino acids
    3. Disaccharides











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    CBSE 12 Class 2019 Paper: 56-4-1 Chemistry

    Question 1)

    Name the defect in the following crystal :

    X^{+}\: Y^{-}\: X^{+}\; Y^{-}

    Y^{-}\: \square \: Y^{-}\; X^{+}

    X^{+}\: \square \: X^{+}\; Y^{-}

    Y^{-}\: X^{+} \: Y^{-}\; X^{+}










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    Question 2)

    When a coordination compound CrCl_{3}.6H_{2}O is mixed with AgNO_{3}, two moles of AgCl are precipitated per mole of the compound. What is the structural formula of the coordination compound ?










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    Question 3)

    What is the difference between a complex and a double salt ?










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    Question 4)

    Define associated colloid with an example.










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    Question 5)

    Why is t-butyl bromide more reactive towards S_{N}1 reaction as compared to n-butyl bromide ?










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    Question 6)

    Write the reaction involved in the Hoffmann bromamide degradation reaction.










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    Question 7)

    Propanamine and N,N-dimethylmethanamine contain the same number of carbon atoms, even though Propanamine has higher boiling point than N,N-dimethylmethanamine. Why ?










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    Question 8)

    Give reasons for the following :

    (a) Aquatic species are more comfortable in cold water than warm water.

    (b) At higher altitudes people suffer from anoxia resulting in inability to think.










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    Question 9)

    What type of azeotropic mixture will be formed by a solution of acetone and chloroform ? Justify on the basis of strength of intermolecular interactions that develop in the solution.










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    Question 10)

    Explain with a graph, the variation of molar conductivity of a strong electrolyte with dilution.










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    Question 11)

    When dilute ferrous sulphate solution is added to an aqueous solution containing nitrate ion followed by careful addition of concentrated sulphuric acid along the sides of test tube, a brown ring is formed at the interface between the solution and sulphuric acid layers. Which anion is confirmed by the appearance of brown ring ? What is the composition of the brown ring ?










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    Question 12)

    How can you prepare Cl_{2} from HCl and HCl from Cl_{2} ? Write reactions only.










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    Question 13)

    Use the data to answer the following and also justify giving reason :

    Cr \; \; \; \;\; \; Mn\; \; \; \; \; \; \; Fe\; \; \; \; \; \; Co

    E^{0}_{M^{2+}/M}\; \; \; -0.91\; \; \; -1.18\; \; \;\; -0.44\; \; \; -0.28

    E^{0}_{M^{3+}/M}\; \; \; -0.41\; \; \; +1.57\; \; \;\; +0.77\; \; \; +1.97

    (a) Which is a stronger reducing agent in aqueous medium,Cr^{2+} or Fe^{2+}and why ?

    (b) Which is the most stable ion in+2 oxidation and why ?










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    Question 14)

    Define with equation :

    (a) Riemer-Tiemann Reaction

    (b) Williamson’s Synthesis










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    Question 15)

    Give the structures of monomers of the following polymers :

    (a) Nylon-6,6

    (b) Buna-S










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    Question 16)

    Classify the following as addition and condensation polymers giving reason :

    (a) Teflon

    (b) PHBV










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    Question 17)

    Chromium crystallises in bcc structure. If its edge length is 300\; pm, find its density. Atomic mass of chromium is 52 \; u.\left [ N_{A}=6.022\times 10^{23}\; mol^{-1} \right ]










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    Question 18)

    At 300 K, 30 g of glucose present in a litre of its solution has an osmotic pressure of 4·98 bar. If the osmotic pressure of a glucose solution is 1·52 bar at the same temperature, what would be its concentration ?










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    Question 19)

    Calculate \Delta _{r}G^{\circ} and log\; K_{c} for the following reaction :

    Cd^{+2}(aq)+Zn(s)\rightarrow Zn^{2+}(aq)+Cd(s)

    Given : E^{0}_{Cd^{2+}/Cd}=-0.403\; V

    E^{0}_{Zn^{2+}/Zn}=-0.763\; V











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    Question 20)

    Chromium metal is electroplated using an acidic solution containing CrO_{3} according to the following equation :

    CrO_{3}(aq)+6H^{+}+6e^{-}\rightarrow Cr(s)+3H_{2}O

    Calculate how many grams of chromium will be electroplated by 24,000 coulombs. How long will it take to electroplate 1·5 g chromium using 12·5 A current ?

    [Atomic mass of Cr=52\; g\; mol^{-1},\; 1\; F=96500\; C\; mol^{-1} ]











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    Question 21)

    Give reasons for the following :

    (a) Leather gets hardened after tanning.

    (b) FeCl_{3} is preferred over KCl in case of a cut leading to bleeding.

    (c) Freundlich isotherm becomes independent of pressure at high pressure for a gas absorbed on a solid.










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    Question 22)

    What is the role of

    (a) Depressants in froth floatation ?

    (b) Carbon monoxide in Mond’s process ?

    (c) Concentrated sodium hydroxide in leaching of alumina from bauxite ?










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    Question 23)

    Write chemical reactions taking place in the extraction of Aluminium from Bauxite ore.










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    Question 24)

    Explain the method of preparation of sodium dichromate from chromite ore. Give the equation representing oxidation of ferrous salts by dichromate ion.










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    Question 25)

    Complete the following reactions :

    MnO_{2}+KOH+O_{2}\; \rightarrow

    I^{-}+MnO^{-}_{4}+H^{+}\; \rightarrow

    Cr_{2}O_{7}^{2-}+Sn^{2+}+H^{+}\; \rightarrow










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    Question 26)

    Write the hybridization and magnetic character of the following complexes :

    (i) \left [ Fe(H_{2}O)_{6} \right ]^{2+}

    (ii) \left [ Ni(CN)_{4} \right ]^{2-}

    [Atomic number : Fe=26,Ni=28]










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    Question 27)

    Give reasons for the following :

    (a) The presence of -NO_{2} group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution
    reactions.

    (b) p-dicholorobenzene has higher melting point than that of ortho or meta isomer.

    (c) Thionyl chloride method is preferred for preparing alkyl chloride from alcohols.










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    Question 28)

    (a) Write equation for preparation of 1-iodobutane from 1-chlorobutane

    (b) Out of 1-bromopentane, 2-bromo-2-methylbutane and 1-bromopentane, which compound is most reactive towards elimination reaction and why ?

    (c) Give IUPAC name of :










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    Question 29)

    (a) How will you synthesise the following alcohol from appropriate alkene :

    (b) Write the mechanism of the following reaction :

    CH_{3}CH_{2}OH\xrightarrow[443\; K]{H^{+}}CH_{2}=CH_{2}+H_{2}0










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    Question 30)

    (a) Give one chemical test to distinguish between the compounds of the following pairs :

    (i) CH_{3}NH_{2} and (CH_{3})_{2}NH

    (ii) Aniline and Ethanamine

    (b) Why aniline does not undergo Friedel-Crafts reaction ?










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    Question 31)

    (a) Give any one property of glucose that cannot be explained by the open chain structure.

    (b) Compare amylase with amylopectin in terms of constituting structure.

    (c) Why do amino acids show amphoteric behaviour ?










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    Question 32)

    Define the following with suitable example of each :

    (a) Antiseptics

    (b) Non-narcotic analgesics

    (c) Cationic detergents










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    Question 33)

    (a) Consider the reaction R\rightarrow P for which the change in concentration of R with time is shown by the following graph :

    (i) Predict the order of reaction.

    (ii) What does the slope of the curve indicate ?

    (b) The rate of reaction quadruples when temperature changes from 293\; K to 313\; K. Calculate E_{a} assuming that it does not change with time. \left [ R=8.314\; JK^{-1\; mol^{-1}} \right ]











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    Question 34)

    (a) Draw the plot of ln\; k vs 1/T for a chemical reaction. What does the intercept represent ? What is the relation between slope and E_{a}?

    (b) A first order reaction takes 30 minutes for 20\; ^{o}/_{o} decomposition. Calculate t_{\frac{1}{2}}. \left [ log\; 2=0.3010 \right ]










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    Question 35)

    (a) Draw the structure of the following :

    (i) HClO_{3}

    (ii) H_{2}S_{2}O_{8}

    (b) Give reasons for the following :

    (i) Above 1000\; K sulphur shows paramagnetism.

    (ii) Although electron gain enthalpy of fluorine is less negative than that of chlorine, yet flourine is a better oxidising agent than chlorine.

    (iii) In solid state PCl_{5} exists as an ionic compound.










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    Question 36)

    (a) Complete the following reactions :

    (i) PbS(s)+O_{3}\rightarrow

    (ii) XeF_{6}+NaF\rightarrow

    (b) Arrange the following in increasing order of property indicated, giving reason :

    (i) Hydrides of group 15 – boiling points

    (ii) Hydrides of group 17 – acidic strength

    (iii) Hydrides of group 16 – reducing character










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    Question 37)

    (a) Carry out the following conversions :

    (i)P-nitrotoluene to 2-bromobenzoic\; acid

    (ii) Propanoic acid to acetic acid

    (b) An alkene with molecular formulaC_{5}H_{10} on ozonolysis gives a mixture of two compounds, B and C. Compound B gives positive
    Fehling test and also reacts with iodine and NaOH solution. Compound C does not give Fehling solution test but forms
    iodoform. Identify the compounds A, B and C.










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    Question 38)

    (a) Carry out the following conversions :

    (i) Benzoic acid to aniline

    (ii) Bromomethane to ethanol

    (b) Write the structure of major product(s) in the following :










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    CBSE 12 Class 2019 Paper: 56-4-2 Chemistry

    Question 1)

    What is the coordination number of atoms in a (i) bcc structure, and (ii) fcc structure ?










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    Question 2)

    Which alkyl halide from the following pair would you expect to react more rapidly by an SN_2 mechanism ?










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    Question 3)

    Why are powdered substances more effective adsorbents than their crystalline forms ?










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    Question 4)

    Write the equations involved in the following reactions :

    (a) Kolbe’s reaction

    (b) Friedel-Crafts alkylation of anisole










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    Question 5)

    Write the structures of monomers of the following polymers :

    (a) Terylene

    (b) Buna-N










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    Question 6)

    Give reasons for the following :

    (a) Brownian movement provides stability to the colloidal solution.

    (b) True solution does not show Tyndall effect.

    (c) Addition of alum purifies the water.










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    Question 7)

    (a) Show how you will synthesise the following alcohol prepared by the reaction of a suitable Grignard reagent on methanal ?

    (b) Write the mechanism of the following reaction :











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    Question 8)

    What happens when D-Glucose is treated with the following reagents :

    (a) Br_2 water

    (b) HCN

    (c) (CH_3CO)_2O










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    Question 9)

    Define the following terms with a suitable example of each :

    (a) Antacids

    (b) Artificial sweeteners

    (c) Anionic detergents










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    CBSE 12 Class 2019 Paper: 56-4-3 Chemistry

    Question 1)

    Write the IUPAC name of










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    Question 2)

    Write the name of monomers and their structures for the following polymers :

    (a) Neoprene

    (b) Nylon-6










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    Question 3)

    What happens when

    (a) Phenol reacts with Conc. H\!N\!O_3 ?

    (b) Ethyl chloride reacts with N\!aOC_2H_5 ?

    Write the chemical equations involved in the above reactions.










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    Question 4)

    Define the following terms with a suitable example of each :

    (a) Sol

    (b) Aerosol

    (c) Hydrosol










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    Question 5)

    (a) What are antidepressant drugs ? Give an example.

    (b) Name the sweetening agent used in preparation of sweets for a diabetic patient.

    (c) Why are detergents non-biodegradable ?










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    Question 6)

    (a) What is the difference between native protein and denatured protein ?

    (b) Which one of the following is a disaccharide : Glucose, Lactose, Amylose, Fructose

    (c) Write the name of the vitamin responsible for the coagulation of blood.










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    Question 7)

    (a) Butan-1-ol has a higher boiling point than diethyl ether. Why ?

    (b) Write the mechanism of the following reaction :

    2CH_3CH_2OH\xrightarrow[413K]{H^+}CH_3CH_2-O-CH_2-CH_3










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    CBSE 12 Class 2019 Paper: 56-5-1 Chemistry

    Question 1)

    A cube solid is made up of two elements A and B. Element A forms ccp while atoms of element B occupy one - third of the tetrahedral voids. What is the formula of the soild?










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    Question 2)

    How will you prepare arsenic sulphide sol in the lab?










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    Question 3)

    Give an example of heterogenous catalysis.










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    Question 4)

    CH_{3}CHO is more reactive than CH_{3}COCH_{3} towards reaction with HCN. Why?










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    Question 5)

    What are the products of exhaustive ammonolysis of an alkyl halide?










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    Question 6)

    What are type of isomerism is shown by complex \left [ Co\left ( NH_{3} \right )_{5}Cl \right ]SO_{4} ?










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    Question 7)

    Arrange the following in increasing order of crystal field splitting energy:

    \left [ Cr\left ( CN \right )_{6} \right ]^{3-}, \left [ Cr(NH_{3})_{6} \right ]^{3+}, \left [ CrCl_{6} \right ]^{3-}










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    Question 8)

    Following reactions may occur at carhode and anode during electrolysis of aqueous sodium chloride. What products will be held at anode and cathode? Use given E^{\circ} values to justify your answer.

    Cathode : Na^{+}(aq)+e^{-}\rightarrow Na (s), E^{\circ}= -2.71V

    H^{+}(aq)+e^{-}\rightarrow \frac{1}{2}H_{2} (g), E^{\circ}=0.00V

    Anode : Cl^{-}(aq)\rightarrow \frac{1}{2}Cl_{2} (g)+e^{-}, E^{\circ}=+1.36V

    2H_{2}O(aq)\rightarrow O_{2} (g)+4H^{+}+4e^{-}, E^{\circ}=+1.23V










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    Question 9)

    Show that for a first order reaction, time required for completion of 99% of reaction is twice the time required for complrtion of 90% of reaction.










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    Question 10)

    Arrange the hydrides of group 16 in order of increasing boiling points, giving reason. Name the hydride which is most stable thermodynamically.










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    Question 11)

    How is KMnO_{4} prepared from pyrolusite? Give steps involved with equations.










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    Question 12)

    An aromatic compound 'A' on treatment with CHCl_{3} and KOH gives two compounds, both of which gives same product 'B' when distilled with zinc dust. Oxidation of 'B' gives 'C' with molecular formula C_{7}H_{6}O_{2}. Sodium salt of 'C' on heating with soda lime gives 'D' which may also be obtained by distilling 'A' with Zinc dust. Identify 'A', 'B', 'C' and 'D'.










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    Question 13)

    How to convert the following:

    (a) Phenol to Toluene

    (b) Ethanol to Ethanal










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    Question 14)

    What happens when D- glucose is treated with the following? Give equations to support your answer.

    (a) HI

    (b) HNO_{3}










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    Question 15)

    Give any two points of difference between globular and fibrous proteins.










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    Question 16)

    Write two differences between DNA and RNA.










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    Question 17)

    (a) Following is the alignment of magnetic moments of a substance when placed in a magnetic field. Identify the type of magnetism exhibited by the substance.

    (b) Analysis shows that nickel oxide has formula Ni_{0.98}O_{1.00}. What frctions of nickel exist as Ni^{2+} and Ni^{3+} ions?










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    Question 18)

    Calculate the emf of the following cell at 25^{\circ}C :

    Al(s)\left | Al^{3+}(0.001M) \right |\left | \right |0.1 Ni^{2+}\left | Ni(s) \right |

    Given: E^{\circ}_{\left ( Ni^{2+}/Ni \right )}= -0.25V

    E^{\circ}_{\left ( Al^{3+}/Al \right )}= -1.66V

    (log 2 = 0.3010, log 3 = 0.4771)










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    Question 19)

    The reaction between A and B is first order with respect to A and zero order with respect to B. For this reaction, fill in the blanks in the following table.

    Experiment[A] mol/L[B] mol/LInitial rate mol/L/min
    I0.10.12.0\times 10^{-2}
    II-0.24.0\times 10^{-2}
    III0.40.4-
    IV-0.22.0\times 10^{-2}











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    Question 20)

    (a) A colloidal solution of AgI is prepared by adding AgNO3 solution drop - by - drop to excess of KI solution. What will be the charge on sol so formed? What is the cause of the charge?

    (b) Which of the following adsorption isobars reperesnts physiorption? Justify the answer.

    (x/m - extent of adsorption, t- temperature.)

    (c) Two gases A and B have critical temperature 430K and 190K respectively. Which gas will be readily adsorbed and why?











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    Question 21)

    State the principle involved in the following metallurgical processes:

    (a) Froth floation

    (b) Zone refining

    (c) Vapour phase refining










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    Question 22)

    Give one point difference between the following:

    (a) Cast Iron and Pig Iron

    (b) Hydraluic washing and Liquation

    (c) Leaching and Roasting










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    Question 23)

    Giv reason for the following:

    (a) The only oxidation state shown by Scandium is +3.

    (b) \left [ Ti(H_{2}O)_{6} \right ]^{+4} is colourless.

    (c) MnO is basic while Mn_{2}O_{7} is acidic.










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    Question 24)

    Answer the following:

    (a) What is the general electronic configuration of lanthanoids?

    (b) What are the common oxidation states of Cerium (At.no. 58)?

    (c) Why do actinoids show a wide range of osidation states?










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    Question 25)

    Using valence bond theory, predict the hybridization and magnetic charater of the following:

    (a) [Co(NH_{3})_{6}]^{3+}

    (b) [Ni(CO)_{4}]

    [ At.no: Co = 27, Ni = 28]











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    Question 26)

    (a) Define the following terms:

    (i) Enantiomers

    (ii) Racemic mixture

    (b) Why is chlorobenzene resistant to nucleophilic substitution reaction?










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    Question 27)

    Give one chemical test to distinguish between the following:

    (a) Phenol and 1-Propanol

    (b) Ethanol amd dimethyl ether

    (c) 1-propanol and 2-Methyl - 2- propanol










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    Question 28)

    Write the products of the following reactions:

    (a) CH_{3}-CH_{2}-O-CH_{3}+HI\rightarrow

    (b) +Br_{2}\overset{CS_{2}}{\rightarrow}

    (c) +CH_{3}COCl\overset{ahyd. AlCl_{3}}{\rightarrow}










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    Question 29)

    Account for the following, supporting your naswer with diagrams or equations wherever possible.

    (a) Diazomium salts of aromatic amines are more stable than those of alihatic amines.

    (b) Methylamine in water reacts with ferric chloride to precipipate hydrated ferric oxide.











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    Question 30)

    Arrange the following in decreasing order of pk_{b} gving reason:

    (a) Aniline, p-nitroanilline and p-toluidine

    (b) C_{2}H_{5}NH_{2}, (C_{2}H_{5})_{2}NH, (C_{2}H_{5})_{3}N in gaseous state.










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    Question 31)

    Answer the following with reasons:

    (a) Is (NH-CHR-CO)_{n}, a homopolymer or copolymer?

    (b) Is PVC a condensation or addition polymer?

    (c) Is Bakelite a thermoplastic or thermosetting plastic?










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    Question 32)

    Answer the following:

    (a) What is the tincture of iodine? What is the use?

    (b) What are the main constituents of dettol?

    (c) Label the hydrophilic and hydrophobic parts of the given compound:

    CH_{3}(CH_{2})_{16}COO(CH_{2}CH_{}O)_{n}CH_{2}CH_{2}OH










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    Question 33)

    (a) Draw the graph between vapour pressure and temperature and explain the elevation in boiling point of a solvent in solution.

    (b) Determine the osmotic pressure of a solution prepared by dissolving 25mg of K_{2}SO_{4} in 2 litres of water at 25^{\circ}C assuming it to be completely dissiciated.(Atomic masses K = 39u, S = 32u, O= 16u)










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    Question 34)

    (a) Write two characteristics of non-ideal solution.

    (b) 2g of benzoic acid (C_{6}H_{5}COOH) dissolved in 25g of benzene shows a dpression in freezing point equal to -1.62K. Molal depression constant for benzene is 4.9 K kg mol-1. What is the percentage association of acid if it forms dimer in solution?










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    Question 35)

    Give reasons for the following

    (a) NO_{2} dimerises readily.

    (b) Chlorine acts as bleaching agent.

    (c) In spite of small size, electron gain enthaply of oxygen is less negative as compared to sulphur.

    (d) Unlike chlorine, fluorine forms only one oxaacid, HOF.

    (e) Noble gas has very low boiling points.











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    Question 36)

    (a) Draw structure and name the shape of the following:

    (i) SF_{4}

    (ii) ICl_{3}

    (b) What happens when (support your answer with equation)

    (i) Chlorine gas is passed through hot and concentrated sodium hydroxide solution?

    (ii) Xenon hexafluoride is subjected to complete hydrolysis?

    (iii) Concentrated sulphuric acid is poured over cane sugar?










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    Question 37)

    (a) Give IUPAC name of CH_{3}-CH =CH-CHO.

    (b) How can you distinguish between ethanol and ethanal?

    (c) How will you convert the following:

    (i) Toulene to benzoic acid

    (ii) Ethanol to propan-2-ol

    (iii) Propanal to 2- hydroxypropanic acid










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    Question 38)

    (a) Give IUPAC name of Salicylic acid.

    (b) Chloroacetic acid is more acidic than acetic acid. Why?

    (c) Write the products formed when (CH_{3})_{3}C-CHO reacts with the following:

    (i) Zinc amalgam and dilute hydrolic acid

    (ii) Concentrated sodium hydroxide solution

    (iii) Semicarbazide and weak acid










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    CBSE 12 Class 2019 Paper: 56-5-2 Chemistry

    Question 1)

    A cube soild is made up of two elements A and B. Element A forms hcp while atoms of element B occupy two-third of the octahedral voids. What is the formula of the soild?










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    Question 2)

    Oxidation of CH_{3}-CHO is easier than CH_{3}-COCH_{3}. Why?










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    Question 3)

    Write the IUPAC name of the following compound:










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    Question 4)

    What happens when

    (a) XeF_{2} is hydrolysed?

    (b) SO_{2} is passed into aqueous solution of Fe^{3+} salt?










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    Question 5)

    Complete and balance the following equations:

    (a) MnO_{4}^{-}+I^{-}+H^{+}\rightarrow

    (b) Na_{2}Cr_{2}O_{7}+KCl\rightarrow










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    Question 6)

    Define the following terms:

    (a) Polysacchrides

    (b) Nucleotides










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    Question 7)

    (a) What type of stiochiometric defect is shown by NaCl and why?

    (b) Calculate its efficency of packing in case of metal crystal for face centred cubic unit cell.










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    Question 8)

    Write the difference between physisorption and chemisorption.










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    Question 9)

    Differentiate between the following:

    (a) Antispetic and Disinfecants

    (b) Antacids and Antihistamines

    (c) Soaps and Detergents










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    Question 10)

    Using valence bond theroy predict the hybridization and magnetic character of the following:

    (a) [CoF_{6}]^{3-}

    (b) [Ni(CN)_{4}]^{2-}










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    CBSE 12 Class 2019 Paper: 56-5-3 Chemistry

    Question 1)

    Write the IUPAC name of .











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    Question 2)

    p-Nitrobenzoic acid has lower pk_{a} value than benzoic acid. Why?










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    Question 3)

    A compound is formed by two elements X and Y. Atoms of the element Y (as anoins) make ccp and those of the elements X (as cations) occupy all octahedral voids. What is the formula of the compound?










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    Question 4)

    Differntiate between:

    (a) Nucleotide and Nucleoside

    (b) Amylose and Amylopectin










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    Question 5)

    What happens when:

    (a) PCl_{5} is heated?

    (b) XeF_{2} reacts with PF_{5}?










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    Question 6)

    Write the preparation of sodium dichromate from Chromite ore.










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    Question 7)

    (a) What type of stoichiometric defect is shown by AgCl and why?

    (b) Calculate the efficiency of packing in case of a metal ceystal for simple cubic unit cell.










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    Question 8)

    Define the following terms:

    (a) Coagulation

    (b) Associated colloids

    (c) Brownian movement










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    Question 9)

    Using valence bond theory, predict the hybidization and magnetic character of the following:

    (a) [NiCl_{4}]^{2-}

    (b) [Co(C_{2}O_{4})_{3}]^{3-}

    [At. no : Co=27, Ni=28]










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    Question 10)

    (a) Which one of the following drugs is an antibiotic:

    Equanil, Ofloxacin, Aspirin, Luminal

    (b) Why is use of aspartame limited to cold food and drinks?

    (c) Why do we require artifical sweeting agents?










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    CBSE 12 Class Compartment 2019 Paper: 56-1-1 Chemistry

    Question 1)

    What is tincture of iodine ? What is its use ?










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    Question 2)

    Predict the number of unpaired electrons in the square planar [Pt(CN)_4]^{2-} ion.










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    Question 3)

    Amongst [Fe(C_2O_4)_2]^{3-} and [Fe(NH_3)_6]^{3+} which is more stable and why ?










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    Question 4)

    Draw the structure of semicarbazone of cyclopentanone.










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    Question 5)

    Draw the structure of product formed when propanal is treated with zinc amalgam and concentrated hydrochloric acid.










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    Question 6)

    Name a carbohydrate present in liver, muscles and brain.










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    Question 7)

    Draw structure for the polymer used for manufacture of non-stick utensils.










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    Question 8)

    Define conductivity and molar conductivity for the solution of an electrolyte. Why does the conductivity of solution decrease with dilution ?










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    Question 9)

    For a reaction, \mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{g})+\mathrm{H}_{2}(\mathrm{g}) \rightarrow \mathrm{C}_{2} \mathrm{H}_{6}(\mathrm{g}), \text { rate }=5 \cdot 5 \times 10^{-14}\left[\mathrm{C}_{2} \mathrm{H}_{4}\right].

    (a) Write the unit of rate constant.

    (b) Calculate its half-life \left ( t_\frac{1}{2} \right ).










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    Question 10)

    (a) Draw the structure of an oxide of nitrogen where the oxidation state of nitrogen is +5.

    (b) With the help of a balanced chemical equation, suggest what happens when white phosphorus reacts with NaOH solution in an inert atmosphere.










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    Question 11)

    (a) Actinoid contraction is greater than lanthanoid contraction. Give reason.

    (b) Out of Fe and Cu, which has higher melting point and why ?










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    Question 12)

    Predict the major product obtained when t-butyl bromide reacts with sodium methoxide. Also, give its IUPAC name.










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    Question 13)

    (a) Show the chemical reaction with bond movements and arrows for the nucleophilic attack of water on carbocation in acid catalysed hydration of alkenes.

    (b) Give IUPAC name for the following :










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    Question 14)

    Aluminium crystallises in a fcc structure. Atomic radius of the metal is 125 pm. What is the length of the side of unit cell of the metal ?










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    Question 15)

    The compound CuCl has fcc structure like ZnS. Its density is 3.04\, g\, cm^{-3} . What is the volume of unit cell ?

    Given : Atomic mass of Cu = 63·5 u; Cl = 35·5 u

    N_A=6.02\times 10^{23}\, mol^{-1}










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    Question 16)

    Answer the following :

    (a) What is the formula of a compound in which element Y forms ccp lattice and atoms X occupy \frac{1}{3}^{rd} of tetrahedral voids ?

    (b) What type of non-stoichiometric point defect leads to colour in alkali metal halides ?










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    Question 17)

    Zinc rod is dipped in 0·01 M solution of zinc sulphate when temperature is 298 K. Calculate the electrode potential of zinc. (Given :

    \mathrm{E}_{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{0}=-0.76 \mathrm{V} ; \log 10=1 )










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    Question 18)

    The rate constant of a first order reaction increases from 2\times 10^{-2} to 6\times 10^{-2} when the temperature changes from 300 K to 320 K. Calculate the energy of activation. (Given : log 2 = 0·3010, log 3 = 0·4771, log 4 = 0·6021)










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    Question 19)

    Answer the following :

    (a) Why is ester hydrolysis slow in the beginning and then becomes faster after some time ?

    (b) In a solution of methylene blue, animal charcoal is added, the solution is then well shaken. What will be observed and why ?

    (c) Give an example of oil in water emulsion.










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    Question 20)

    Define the following :

    (a) Associated colloids

    (b) Electrophoresis

    (c) Zeta potential










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    Question 21)

    (a) What is the difference between calamine and malachite ?

    (b) Why is zinc used instead of Cu for recovery of Ag from [Ag(CN)_2]^- ?

    (c) What is the role of cryolite in metallurgy of Al ?










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    Question 22)

    (a) Give two points of differences between pig iron and cast iron.

    (b) Outline the principle of zone refining.










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    Question 23)

    (a) Complete the following chemical reactions :

    (i) $\quad \mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{KCl} \rightarrow$

    (ii) $\quad 2 \mathrm{MnO}_{4}^{-}+5 \mathrm{SO}_{3}^{2-}+6 \mathrm{H}^{+} \rightarrow$

    (b) How does the colour of Cr_2O_7^{2-} change when treated with an alkali ?










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    Question 24)

    (a) Draw the structures of geometrical isomers of [Fe(NH_3)_2(CN)_4]^- .

    (b) [NiCl_4]^2^- is paramagnetic while [Ni(CO)_4] is diamagnetic though both are tetrahedral. Why ? [Atomic number of Ni = 28]










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    Question 25)

    Define the following :

    (a) Ambidentate ligands

    (b) Spectro chemical series

    (c) Heteroleptic complexes










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    Question 26)

    (a) Write the product formed when

    (i) 2-chloropropane is treated with alc. KOH.

    (ii) Aniline reacts with conc. H_2SO_4 at 453 – 473 K.

    (b) When aniline is heated with CHCl_3 and alc. KOH, a foul smelling compound is formed. What is this compound ?










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    Question 27)

    (a) How will you convert the following :

    (i) Phenol to benzoquinone

    (ii) Propanone to 2-methyl propan-2-ol

    (b) Why does propanol have higher boiling point than that of butane ?










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    Question 28)

    (a) Identify X and Y in the following :

    (b) Amino group is o, p-directing for aromatic electrophilic substitution reactions. Why does aniline on nitration give m-nitroaniline ?










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    Question 29)

    (a) What happens when D-glucose is treated with the following reagents :

    (i) HI

    (ii) conc. H\!N\!O_3

    (b) What is the basic structural difference between starch and cellulose ?










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    Question 30)

    (a) Write the names of monomers of following polymer :

    (b) What does part 6,6 mean in the polymer Nylon-6,6 ?

    (c) Give an example of Biodegradable polymer.










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    Question 31)

    (a) Differentiate between antiseptic and disinfectant. Give one example of each.

    (b) Why do we require artificial sweetening agents ?










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    Question 32)

    Define the following terms :

    (a) Tranquilizers

    (b) Ant-acids

    (c) Analgesics










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    Question 33)

    (a) A 5% solution (by mass) of cane sugar in water has a freezing point of 271 K. Calculate the freezing point of 5% solution (by mass) of glucose in water. The freezing point of pure water is 273·15 K.

    (b) Why is osmotic pressure of 1 M KCl higher than 1 M urea solution ?

    (c) What type of liquids form ideal solutions ?










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    Question 34)

    (a) 1·0 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0·40 K. The freezing point depression constant of benzene is 5.12\: K\: kg\: mol^{-1} . Find the molar mass of the solute.

    (b) What is the significance of Henry’s law constant, K_H ?

    (c) What leads to anoxia ?










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    Question 35)

    A crystalline solid ‘A’ burns in air to form a gas ‘B’ which turns lime water milky. The gas is also produced as a by-product during roasting of sulphide ore. This gas decolourises acidified K\!MnO_4 (aq.) solution and reduces Fe^{3+} to Fe^{2+}. Identify ‘A’ and ‘B’ and write the reactions involved.










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    Question 36)

    Answer the following :

    (a) Arrange the following hydrides of Group 16 elements in the decreasing order of their acidic strength :

    H_2O,H_2S,H_2Se,H_2Te

    (b) Which one of PCl_4^+ and PCl_4^- is not likely to exist and why ?

    (c) Which allotrope of sulphur is thermally stable at room temperature ?

    (d) Write the formula of a compound of phosphorus which is obtained when conc. H\!N\!O_3 oxidises P_4.

    (e) Why does PCl_3 fume in moisture ?










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    Question 37)

    (a) An organic compound with the molecular formula C_7H_6O forms 2,4-DNP derivative, reduces Tollen’s reagent and undergoes Cannizzaro reaction. On oxidation, it gives benzoic acid. Identify the compound and state the reactions involved.

    (b) Give chemical tests to distinguish between the following pair of compounds :

    (i) Phenol and propanol

    (ii) Benzoic acid and benzene










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    Question 38)

    (a) Predict the products of the following:

    (b) Arrange the following in increasing order of acidic character :

    HCOOH,CF_3COOH,ClCH_2COOH,CCl_3COOH










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    CBSE 12 Class Compartment 2019 Paper: 56-1-2 Chemistry

    Question 1)

    What are food preservatives ? Give an example.










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    Question 2)

    Is a homopolymer or copolymer?










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    Question 3)

    What are the hydrolysis products of sucrose?










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    Question 4)

    (a) Draw the structure of \textup{H}_2\textup{SO}_7.
    (b) What happens when carbon reacts with conc. \textup{H}_2\textup{SO}_4? Write a balanced chemical equation.










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    Question 5)

    Give reasons:

    (a) Of the \textup{d}^4 species, \textup{Cr}^{2+} is strongly reducing while \textup{Mn}^{3+} is strongly oxidizing.

    (b) The \textup{d}^1configuration is very unstable in ions.










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    Question 6)

    (a) Atoms of element B form hcp lattice and those of the element A occupy \frac{2}{3}^{\textup{rd}} of octahedral voids. What is the formula of the compound formed by the elements A and B?

    (b) What type of stoichiometric defect is shown by ZnS and why?










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    Question 7)

    (a) Complete the following chemical reactions:

    (i) 2\textup{MnO}_4^- + 5\textup{NO}_2^- + 6\textup{H}^+ \rightarrow

    (ii) 3\textup{MnO}_4^{2-} + 4\textup{H}^+ \rightarrow

    (b) Name a member of the lanthanoid series which shows +4 oxidation state.










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    Question 8)

    (a) How will you convert the following :
    (i) Phenol to benzene
    (ii) Propene to propanol
    (b) Why is ortho-nitrophenol more acidic than ortho-methoxyphenol?










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    Question 9)

    (a) Identify ‘A’ and ‘B’ in the following reaction:

    \xrightarrow {\textup{Sn} + \textup{HCl}} A\xrightarrow {\textup{Br}_2/\textup{H}_2\textup{O}} B

    (b) Why is ethylamine soluble in water whereas aniline is not?










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    Question 10)

    Write the names and structures of the monomers of the following polymers :
    (a) Neoprene
    (b) Bakelite
    (c) PVC










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    CBSE 12 Class Compartment 2019 Paper: 56-1-3 Chemistry

    Question 1)

    Identify the monomers of the following polymer :










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    Question 2)

    What are the hydrolysis products of lactose ?










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    Question 3)

    Name a substance which can be used as an antiseptic as well as a disinfectant.










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    Question 4)

    (a) Atoms of element Q form ccp lattice and those of the element P \frac{2}{3} \mathrm{rd} of tetrahedral voids. What is the formula of the compound formed by the elements P and Q?

    (b) What type of stoichiometric defect is shown by KCl and why?










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    Question 5)

    (a) Draw the structure of \text{XeF}_4.

    (b) What happens when \text{CaF}_2 reacts with conc. \text{H}_2\text{SO}_4? Write balanced chemical equation.










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    Question 6)

    (a) Write chemical equations involved in the preparation of \mathrm{KMnO}_4 from \mathrm{MnO}_2.
    (b) Actinoids show a wide range of oxidation states. Why?










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    Question 7)

    Write the names and structures of the monomers of the following polymers:

    (a) Teflon
    (b) Terylene
    (c) Buna-N










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    Question 8)

    (a) Identify ‘A’ and ‘B’ in the following reaction:

    \xrightarrow {(\text{CH}_3\textup{CO})_2O} A \xrightarrow [\text{CH}_3\text{COOH}]{Br_2}B

    (b) Why does aniline not undergo Friedel-Crafts reaction?










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    Question 9)

    (a) How will you convert the following:

    (i) Ethanal to propan-2-ol
    (ii) Phenol to 2-hydroxyacetophenone

    (b) Why is phenol more acidic than ethanol? Why is phenol more acidic than ethanol?










    View Solutions


    More About CBSE Class 12 Chemistry Question Paper 2019 with Solutions

    The total analysis of CBSE class 12 Chemistry question paper 2019 with solutions will give an idea of weightage and what is the pattern of the CBSE class 12 Chemistry previous year question papers.

    Also read -

    CBSE class 12 Chemistry 2019 Question Paper pattern

    There are a total of 27 questions divided into 4 sections, namely A, B, C, and D. The distribution of questions is given below.

    Section

    No. of Questions

    Marks per Question

    Total marks

    A

    5

    1

    5

    B

    7

    2

    14

    C

    12

    3

    36

    D

    3

    5

    15


    There is no overall choice. However, an internal choice has been provided in two

    questions of one mark, two questions of two marks, four questions of three marks

    and three questions of five marks. You have to attempt only one of the

    choices in such questions.


    Types of questions in CBSE Chemistry paper 2019

    The questions asked in the chemistry class 12 question paper can be divided into Physical chemistry, Organic chemistry, and Inorganic chemistry. Some of the questions may have both theory and numerical combined in physical chemistry questions, rest will be theoretical in nature. Mostly the 5 marks questions belong to Physical chemistry in which numerals are being asked and few 5 markers are Inorganic reactions based questions. All these can be solved with the help of CBSE class 12 Chemistry question paper 2019 with solutions

    Types of questions

    Total marks

    Physical Chemistry Questions

    24

    Organic Chemistry Questions

    20

    Inorganic chemistry Questions

    26

    Hence from the above distribution, it is clear that the weightage of inorganic chemistry is highest, hence theoretical questions weightage is quite high. Organic chemistry holds weightage of 20 marks and it is very easy to score maximum marks in this part as questions are asked from basic concepts only.

    The summary of the analysis of CBSE Chemistry paper 2019 sets are given below.


    CBSE class 12 Chemistry 2019 Question Paper analysis

    The below-given table gives an idea about the marks distribution of various CBSE 12 Chemistry question paper 2019, which gives an idea about the importance of respective chapters in the class 12 Chemistry board paper 2019

    Sl.No

    Chapter name

    Marks Distribution

    1

    Solid State

    4

    2

    Solution

    7

    3

    Electrochemistry

    5

    4

    Chemical Kinetics

    5

    5

    General isolation of Elements

    3

    6

    Surface Chemistry

    3

    7

    p- block elements

    3

    8

    d-f, block elements

    3

    9

    Coordination compounds

    7

    10

    Organic Chemistry

    20

    11

    Biomolecules

    3

    12

    Polymers

    2

    13

    Chemistry in Everyday Life

    3


    Total

    70


    From the table of analysis of CBSE class 12 Chemistry paper 2019 it can be said that Electrochemistry, chemical kinetics, coordination compounds, and organic compounds hold high weightage. Hence extra attention at these chapters must be given along with Biomolecules, polymers, and Chemistry in everyday life as these are very easy chapters, and questions asked are straight forward. The overall analysis shows that all the chapters are important for Previous Year CBSE Class 12 Chemistry Question Paper 2019 with a special focus on the above-mentioned chapters.

    Conclusion

    The CBSE 12 Chemistry question paper 2019 seems to be quite moderate as far as the difficulty level is concerned and those who studied well and completed the syllabus are supposed to get decent marks. Questions belonging to organic chemistry were based on basic concepts and numericals were also easy. All the theory-based questions asked in the CBSE class 12 Chemistry paper 2019 are from the NCERT book.

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    Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.

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