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    NCERT Exemplar Class 11 Chemistry Solutions Chapter 1 Some Basic Concepts of Chemistry

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    NCERT Exemplar Class 11 Chemistry Solutions Chapter 1 Some Basic Concepts of Chemistry

    Edited By Sumit Saini | Updated on Sep 10, 2022 03:58 PM IST

    NCERT Exemplar Class 11 Chemistry solutions chapter 1 Some Basic Concepts of Chemistry provides detailed explanations on the importance of some of the basic concepts and laws of Chemistry. These laws include Avogadro’s Law, Law of Conservation of Mass, and many more. NCERT Exemplar Class 11 Chemistry chapter 1 solutions have been drafted by the experts in such a way that anyone who goes through it gets a deep insight into the topics related to the basic terms used in Chemistry. The experts have provided solutions for numerous questions in a detailed step-by-step process to ensure understanding of the students on the various topics covered.

    NCERT Exemplar Class 11 Chemistry Solutions Chapter 1: MCQ (Type 1)

    Question:1

    Two students performed the same experiment separately, and each one of them recorded two readings of mass which are given below. Correct reading of mass is 3.0 g. On the basis of given data, mark the correct option out of the following statements.

    Student
    Reading
    (i)
    (ii)
    A
    3.01
    2.99
    B
    3.05
    2.95

    (i) Results of both the students are neither accurate nor precise.
    (ii) Results of student A are both precise and accurate.
    (iii) Results of student B are neither precise nor accurate.
    (iv) Results of student B are both precise and accurate.

    Answer:

    The answer is the option (ii) Results of student A are both precise and accurate.

    Explanation: First, we calculate, the average of both the readings of student A and B. Student A's average is 3.00, and student B's average is also 3.00. The correct reading of the mass is 3.00g. Therefore, both the students have gotten an average value close to the correct value and are accurate. But student A's values differ only by 0.02 and are precise while B's readings are not close to each other and differ by 0.1, and thus are not precise.

    Therefore, A has the readings which are both precise and accurate.

    Question:2

    A measured temperature on Fahrenheit scale is 200 °F. What will this reading be on Celsius scale?
    (i) 40 °C
    (ii) 94 °C
    (iii) 93.3 °C
    (iv) 30 °C
    Answer:

    The answer is the option iii) 93.3 °C
    Explanation:
    ^{o}F=\frac{9}{5} (^{o}C)+32
    ^{o}C=\frac{5}{9} (^{o}F-32)
    ^{o}C=\frac{5}{9} (200-32)=93.3

    Question:3

    What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL?
    (i) 4 mol L-1
    (ii) 20 mol L-1
    (iii) 0.2 mol L-1
    (iv) 2 mol L-1
    Answer:

    The answer is the option (iii) 0.2 mol L-1
    Explanation: First, calculating the number of moles of NaCl =\frac{5.85}{58.5}=0.1\; mol/L
    500\; ml=\frac{500}{1000}=0.5L
    Molarity (M) = number of moles of solute/ Volume of solution in litres
    Molarity =\frac{0.1}{0.5}
    Molarity = 0.2 M

    Question:4

    If 500 mL of a 5M solution is diluted to 1500 mL, what will be the molarity of the solution obtained?
    (i) 1.5 M
    (ii) 1.66 M
    (iii) 0.017 M
    (iv) 1.59 M
    Answer:

    The answer is the option (ii) 1.66 M
    Explanation: Using M1V1 = M2V2
    5 \times 500=M_{2} \times 1500
    M2=\frac{(5 \times 500)}{1500}
    M_{2}=1.66 M

    Question:5

    The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?
    (i) 4 g of He
    (ii) 46g Na
    (iii) 0.40 g of Ca
    (iv) 12g He
    Answer:

    The answer is the option (iv) 12g He
    Explanation:
    Using the previous formula,
    12 g He=3 moles Of He
    Number of atoms of He=3\times N_{A}
    Number of atoms of He=3\times\left ( 6.022\times 10^{23} \right )

    Question:6

    If the concentration of glucose (C_{6}H_{12}O_{6}) in blood is 0.9 g L-1, what will be the molarity of glucose in blood?
    (i) 5 M
    (ii) 50 M
    (iii) 0.005 M
    (iv) 0.5 M

    Answer:

    The answer is the option (iii) 0.005 M
    Explanation:
    Given; Concentration of glucose- (C_{6}H_{12}O_{6}) in blood =0.9/L
    Molar mass of glucose = 180 g/mol
    Concentration/molar mass =\frac{0.9}{180}
    =\frac{1}{200}\; moles=0.005\; moles
    Therefore the Molarity of glucose in blood is 0.005 M.


    Question:7

    What will be the molality of the solution containing 18.25 g of HCI gas in 500 g of water?
    (i) 0.1 m
    (ii) 1M
    (iii) 0.5 m
    (iv) 1m

    Answer:

    The answer is the option (iv) 1m
    Explanation:
    Number. of moles of HCl =\frac{18.25}{36.5}=0.5
    Molality (m) = Number of moles (in the solute)/ Mass of the solute (kg)
    Molality =\frac{0.5\times 1000}{500}
    Molality = 1m


    Question:8

    One mole of any Substance contains 6.022\; \; 10^{23} of Atoms/molecules of H_{2}SO_{4} present in the 100 mL of 0.02M H_{2}SO_{4} solution is
    (i) 12.044 \times 10^{20} molecules
    (ii) 6.022 \times 10^{23} molecules
    (iii) 1 \times 10^{23}molecules
    (iv) 12.044 \times 10^{23} molecules
    Answer:

    The answer is the option (i) 12.044\times 10^{20} molecules.
    Explanation:
    Given: Molarity = 0.02 M
    Given; Volume of solution = 100ml = 0.1 L
    Number of moles Of H_{2}SO_{4} = Molarity × Volume ( litres)
    Number of molecules of H_{2}SO_{4} = 2 \times 10^{-3} \times 6.022 \times 10^{23}
    Number of molecules = 12.044\times 10^{20} Molecules

    Question:9

    What is the mass percent of carbon in carbon dioxide?
    (i) 0.034%
    (ii) 27.27%
    (iii) 3.4%
    (iv) 28.7%
    Answer:

    The answer is the option (ii) 27.27%

    Explanation:
    Molar mass of CO_{2} = (1\times 12) + (2 \times 16) = 44 g
    Therefore, 1 g of CO_{2} contains 1 g of carbon
    44 g of CO_{2} therefore contains 12 g of carbon.
    % of C in CO_{2} ==\frac{12}{44}\times 100=27.27\; ^{o}/_{o}

    Question:10

    The empirical formula and molecular mass of a compound are CH_{2}O and 180 g respectively. What will be the molecular formula of the compound?
    (i) C_{9}H_{18}O_{9}
    (ii) CH_{2}O
    (iii) C_{6}H_{12}O_{6}
    (iv) C_{2}H_{4}O_{2}

    Answer:

    The answer is the option (iii) C_{6}H_{12}O_{6}
    Explanation:
    Empirical formula of CH_{2}O is CH_{2}O
    Calculating empirical formula mass = 12+(1\times 2)+16=30g
    Given: Molecular mass= 180g
    n = Molecular mass/ empirical formula mass
    n=\frac{180}{30}=6
    Therefore, Molecular formula = n\times CH_{2}O=6\times CH_{2}O=C_{6}H_{12}O_{6}

    Question:11

    If the density of a solution is 3.12 g mL-1, the mass of 1.5 mL solution in significant figures is _______.
    (i) 4.7g
    (ii) 4680 × 10-3 g
    (iii) 4.680g
    (iv) 46.80g
    Answer:

    The answer is the option (i) 4.7g
    Explanation:
    Given, the density of a solution = 3.12 g mL-1
    Volume = 1.5 mL
    Mass = Volume × Density
    = 1.5mL × 3.12g m/L
    = 4.68 g which when rounded to 2 significant figures is 4.7 g.

    Question:12

    Which of the following statements about a compound is incorrect?
    (i) A molecule of a compound has atoms of different elements.
    (ii) A compound cannot be separated into its constituent elements by physical methods of separation.
    (iii) A compound retains the physical properties of its constituent elements.
    (iv) The ratio of atoms of different elements in a compound is fixed.

    Answer:

    The answer is the option (iii) A compound retains the physical properties of its constituent elements.
    Explanation:
    The compound can be completely indifferent and in contrast to the physical properties of its constituent elements.

    Question:13

    Which of the following statements is correct about the reaction given below:
    4Fe(s) + 3O_{2} (g) \rightarrow 2Fe_{2}O_{3} (g)

    (i) Total mass of iron and oxygen in reactants = total mass of iron and oxygen in product therefore it follows Law of conservation of mass.
    (ii) Total mass of reactants = total mass of product; therefore, Law of multiple proportions is followed.
    (iii) Amount of Fe_{2}O_{3} can be increased by taking any one of the reactants (iron or oxygen) in excess.
    (iv) Amount of Fe_{2}O_{3} produced will decrease if the amount of any one of the reactants (iron or oxygen) is taken in excess.
    Answer:

    The answer is the option (i) Total mass of iron and oxygen in reactants = total mass of iron and oxygen in product therefore it follows Law of conservation of mass.
    Explanation:
    Keeping the Law of conservation in mind, we evaluate both the sides of every equation. The mass of the reactants should be equal to the of the product, and this is only followed in equation (i), therefore it is correct.

    Question:14

    Which of the following reactions is not correct according to the law of conservation of mass.
    (i)2Mg(s) + O_{2} (g) \rightarrow 2MgO(s)
    (ii) C_{2} H_{8} (g) + O_{2} (g) \rightarrow CO_{2} (g) + H_{2}O(g)
    (iii) P_{4}(s) + 5O_{2}(g) \rightarrow P_{4}O_{10}(s)
    (iv) CH_{4}(g) + 2O_{2}(g) \rightarrow CO_{2}(g) + 2H_{2}O(g)
    Answer:

    The answer is the option (ii) C_{2} H_{8} (g) + O_{2} (g) \rightarrow CO_{2} (g) + H_{2}O(g)
    Explanation:
    Again, following the Law of energy, the number of atoms on the reactant side should be equal to the product side. Option (ii) does not follow the rule.

    Question:15

    Which of the following statements indicates that Law of multiple proportion is being followed?
    (i) Sample of carbon dioxide taken from any source will always have carbon and oxygen in the simple ratio 1:2,
    (ii) Carbon forms two oxides namely CO_{2} and CO. where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2:1.
    (iii) When magnesium burns in oxygen, the amount of magnesium taken for the reaction is equal to the amount of magnesium in magnesium oxide formed.
    (iv) At constant temperature and pressure 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour.
    Answer:

    The answer is the option (ii) Carbon forms two oxides namely CO_{2} and CO. where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2:1.
    Explanation:
    According to the Law of multiple proportions,

    NCERT Exemplar Class 11 Chemistry Solutions Chapter 1: MCQ (Type 2)

    Question:16

    One mole of oxygen gas at STP is equal to ________
    (i) 6.022\times 10^{23} molecules of oxygen
    (ii) 6.022\times 10^{23} atoms of oxygen
    (iii) 16 g of oxygen
    (iv) 32 g of oxygen

    Answer:

    The answer are the options (i) and (iv)
    Explanation:
    1 mole of oxygen gas at STP = 6.022\times 10^{23} molecules of oxygen (which is the Avogadro number)
    1 mole O_{2}=32g \; of \; O_{2}
    Thus, one mole of O_{2} is equal to the molecular weight of oxygen and the Avogadro number.

    Question:17

    Sulphuric acid reacts with sodium hydroxide as follows :
    H_{2}SO_{4} + 2NaOH \rightarrow Na_{2}SO_{4} + 2H_{2}O
    When 1L of 0.1M sulphuric acid solution is allowed to react with 1L of 0. 1M sodium hydroxide solution, the amount of sodium sulphate and its molarity in the solution obtained is

    (i) 0.1 mol L-1
    (ii) 7.10 g
    (iii) 0.025 mol L-1
    (iv) 3.55 g
    Answer:

    The answer are the options (ii) and (iii)
    H_{2}SO_{4} + 2NaOH \rightarrow Na_{2}SO_{4} + 2H_{2}O
    Given, (0.1 M), Moles of H2SO4 = 0.1 moles
    Given, (0.1M), Moles of NaOH = 0.1 moles
    The ratio of H2SO4 ­and NaOH is 1:2, using the ratio, we figure for 0.1 mole of H2SO4 , 0.2 moles of NaOH is used, which is not available.
    Therefore if 0.1 moles of NaOH reacts, then only 0.05(0.1/2) moles of H2SO4 is used. NaOH is the limiting reactant, and the reaction and products are evaluated according to the limiting reactant.
    Therefore the number of moles formed of Na2SO4 will be 0.05 as well.
    This is because 2 moles of NaOH produces 1 mole of H2SO4, therefore 1 mole of NaOH will logically produce 0.05 moles of Na2SO4.
    Therefore, mass of Na2SO4 = 0.05 × (molar mass)
    0.05 × (23 ×2 + 32 + 16× 4)
    0.05 × 142 = 7.1 g
    Molarity = Number of moles / Volume in L
    Molarity = 0.05/ 2 L = 0.023 mol/L

    Question:18

    Which of the following pairs have the same number of atoms ?
    (i) 16 g of O_{2} (g) and 4 g of H_{2} (g)
    (ii) 16 g of O_{2} and 44 g of CO_{2}
    (iii) 28 g of N_{2} and 32 g of O_{2}
    (iv) 12 g of C (s) and 23 g of Na(s)

    Answer:

    The answer are the options (iii) and (iv)
    Explanation:
    One mole is measured as the amount of a substance that equal number of atoms as contained in exactly 12 g of Carbon.
    1 mole of C = 12g C
    While 23 grams of Na (mass) = 1 mole of Na
    28g N2 = 1 mole of nitrogen = 2 × atoms of nitrogen
    This is 2 \times (6.022 \times 10^{23})atoms of nitrogen
    32g O2 = 1 mole of oxygen = 2 \times (6.022 \times 10^{23}) atoms of oxygen

    Question:19

    Which of the following solutions have the same concentration?
    (i) 20 g of NaOH in 200 mL of solution
    (ii) 0.5 mole of KCl in 200 mL of solution
    (iii) 40 g of NaOH in 100 mL of solution
    (iv) 20 g Of KOH in 200 mL of solution

    Answer:

    The answer are the options (i) and (ii)
    Explanation: (i) 20 g NaOH in 200 mL solution.

    \frac{20}{40}=0.5 mol of NaOH
    (ii) Molar concentration Of NaOH
    \frac{0.5\; mol}{0.2\; L}=2.5 \; M as 200 mL = 0.2 L
    Molar concentration of KCl = \frac{0.5\; mol}{0.2\; L}=2.5 \; M

    Question:20

    16 g of oxygen has same of molecules as in
    (i) 16 g of CO
    (ii) 28 g of N_{2}
    (iii) 14 g of N_{2}
    (iv)) 1.0 g of H_{2}
    Answer:

    The answer are the options (iii) and (iv)
    Explanation: 1 mole or the number of molecules of oxygen in 16g Of oxygen is
    \frac{16}{32}\times \left ( 6.023 \times 10^{23} \right )
    =0.5\times \left ( 6.023\times 10^{23} \right ) molecules
    In 14g or N2 and 1 g of H2 contain 0.5 moles. Therefore they will also contain 0.5\times \left ( 6.023\times 10^{23} \right ) molecules
    Number of molecules of N2
    =\frac{14}{28}\times \left ( 6.023\times 10^{23} \right )
    =0.5\times \left ( 6.023\times 10^{23} \right ) molecules
    Number of molecules of H2
    =\frac{1}{2}\times 6.023\times 10^{23}
    =0.5\times \left ( 6.023\times 10^{23} \right ) molecules

    Question:21

    Which of the following terms are unitless?
    (i) Molality
    (ii) Molarity
    (iii) Mole fraction
    (iv) Mass percent

    Answer:

    The answer are the options (iii) and (iv)
    Explanation:
    Mole Fraction: It is the particular ratio of the substance in the solution in comparison to the total components of the solution. It is the ratio of the number of moles of the particular component to the total number of moles in the solution.
    While, Mass percent=\frac{Mass\; of\; solute}{Mass\; of\; solution}\times 100





    Question:22

    One of the Statements of Dalton 's atomic theory is given below; "Compounds are formed when atoms of different elements combine in a fixed ratio". Which of the following laws is not related to this statement?
    (i) Law of conservation of mass
    (ii) Law Of definite proportions
    (iii) Law of multiple proportions
    (iv) Avogadro's Law

    Answer:

    The answer are the options (i) and (iv)
    Explanation:
    For (iv), Avogadro suggested that equal volumes of gases will contain equal number of molecules, if the temperature and pressure remain the same.
    While the Law of conservation of mass states that matter can neither be created nor Destroyed but just transformed from one form to another.

    NCERT Exemplar Class 11 Chemistry Solutions Chapter 1: Short Answer Type

    Question:23

    What will be the mass of one atom of C-12 in grams?
    Answer:

    Mass of 6.022\times 10^{23} atoms of C in gm =12g
    Therefore, mass of one atom of C=\frac{12}{6.023\times 10^{23}} , this is 1.992648\times 10^{-23} g

    Question:25

    What is the symbol for SI unit of mole? How is the mole defined?

    Answer:

    The symbol for Sl unit of mole is 'mol'. One mole is measured as the amount of a substance that equal number of atoms as contained in exactly 12 g of Carbon.

    Question:26

    What is the difference between molality and molarity?

    Answer:

    Molarity: It is the number of moles of solute present in 1 litre of the solution. It is denoted by M. It is dependent on temperature.
    Molarity (M) = \frac{Number\; of\; moles\; of\; solute}{Volume\; of \; solution\; in\; litres}
    Molality: It is the number of moles of solute present in 1 kg of solvent. It is denoted by m. It is independent on temperature.
    Thus, Molality (m)= \frac{Number\; of\; moles\; of\; the\; solute}{Mass\; of\; Solvent\; in\; kg}

    Question:27

    Calculate the mass percent of calcium, phosphorus and oxygen in calcium Phosphate; Ca_{3} (PO_{4}��)_{2}

    Answer:

    Molecular mass of Ca_{3} (PO_{4}��)_{2}
    =\left ( 3\times 40 \right )+\left [ 2\left ( 31+16\times 4 \right ) \right ]=310
    Mass percent of Calcium =\frac{3x \; Atomic \; mass \; of \; calcium}{Total\; molecular \; mass\; of \; calcium \; Phosphate}\times 100
    =\frac{3\times 40}{310}\times 100= 38.71\; ^{o}/_{o}
    Likewise,
    Mass percent of phosphorus = \frac{2x \; Atomic \; mass \; of \; Phosphorous}{Total\; molecular \; mass\; of \; calcium\; Phosphate}\times 100
    =\frac{2\times 31}{310}\times 100= 20\; ^{o}/_{o}
    Mass percent of Oxygen=\frac{2x \; Atomic \; mass \; of \; Oxygen}{Total\; molecular \; mass\; of \; calcium\; Phosphate}\times 100
    =\frac{2\times 64}{310}\times 100= 41.29\; ^{o}/_{o}

    Question:28

    45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 454 L of nitrous oxide was formed. The reaction is given below. 2N_{2}(g)+O_{2}(g)\rightarrow 2N_{2}O(g) Which Law is being obeyed in this experiment? Write the statement of the Law?

    Answer:

    The Law being obeyed in this experiment is Gay Lussac's Law of Gaseous Volumes. The Law states, gases react with each other in a simple ratio by volume, provided the gases are maintained at a constant temperature and pressure.

    Some basic concepts of Chemistry Excercise: 1.2

    Question:29

    If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number
    (a) Is this statement true?
    (b) If yes, according to Which Law?
    (c) Give one example related to this Law.

    Answer:

    (a) Yes, the statement is true.
    (b) The statement is true due to the Law of multiple proportions.
    (c) Citing an example; carbon combines with oxygen to form ; CO and CO2
    The mass of oxygen, when reacted with a fixed mass of carbon (12 g) have a simple ratio i.e.,16:32 = 1:2

    Question:30

    Calculate the average atomic mass of hydrogen using the following data:

    Isotope

    % Natural Abundance

    Molar Mass

    1H

    99.985

    1

    2H

    0.015

    2



    Answer:

    Average atomic mass = \frac{(Natural\; Abudance\; of\; ^{1}H \times Molar\; mass)+(Natural\; Abudance\; of\; ^{2}H \times Atomic\; mass)}{100}
    =\frac{(99.985\times 1)+(0.015\times 2)}{100}
    =\frac{100.015}{100}=1.00015\; \upsilon


    Question:32

    The density of 3 molal solutions of NaOH is 1.110 g mL-1 . Calculate the molarity of the solution.
    Answer:

    3 molal solution Of NaOH has 3 mols Of NaOH which are dissolved in 1000 g of solvent.
    Therefore, the Mass of Solution-= Mass of SoIvent + Mass of Solute
    =1000g+(3\times 40\; g)
    =1120\; g
    Volume of Solution =\frac{MASS}{DENSITY}
    =\frac{1120}{1.110\; mL}=100.90\; mL
    Given the density of solution =1.110 g m/L-1
    Since 1009 mL solution has 3 mols Of NaOH
    Molarity (M) = \frac{Number \; of\; moles\; of\; solute}{Volume\; of\; solution\; in\; litres}
    \frac{3\; mol}{1009.00}=2.97\; M


    Question:33

    Volume of a solution changes with change in temperature, then, will the molality of the solution be affected by temperature? Give reason for your answer.

    Answer:

    No, it will not. The molality of any solution is indifferent to temperature changes as molality is expressed in mass and mass is unaffected by temperature fluctuations.
    Molality (m) = \frac{number\; of\; moles\; of\; the\; solute}{Mass\; of\; Solvent\; in\; kg}


    Question:34

    If 4 g of NaOH dissolves in 36 g of H2O, calculate the mole fraction of each component in the solution. Also, determine the molarity of solution (specific gravity of solution is 1g mL-1).

    Answer:

    As per information given in the question, Mass of NaOH = 4g
    Therefore, Number of moles of NaOH=\frac{4}{40}=0.1\; mol
    Number of moles of water =\frac{36}{18}=2\; mols
    Mole fraction of water =\frac{Number\; of\; moles\; of\; water}{Total\; number\; of\; moles(water+NaOH)}\frac{2}{2.1}=0.952
    Mole fraction of NaOH = \frac{Number\; of\; moles\; of\; NaOH}{Total\; number\; of\; moles(water+NaOH)}\frac{0.1}{2.1}=0.047
    Now, mass of solution = Mass of water + Mass of NaOH=36+4=40 \; g
    Volume =\frac{40}{1}=40\; mL
    Molarity in solution = \frac{Number\; of\; moles\; of\; solute}{Volume\; of\; solute\; in\; Litre}=\frac{0.1\; mol\; NaOH}{0.04L}=2.5 M

    Question:35

    The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction 2A + 4B → 3C + 4D, when 5 moles of A react with 6 moles of B, then
    (i) which is the limiting reagent?
    (ii) calculate the amount of C formed?

    Answer:

    2A + 4B \rightarrow 3C + 4D
    A and B are in the ratio- 2:4, 2 mols of 'A' require 4 mols of 'B' .
    (i) For 5 mols of A, 10 mols of 'B' will be required using the ratio of 2:4.
    i.e. 5 mol of A\times \frac{4\; mol\; of\; B}{2\; mol\; of\; A}=10 mol of
    But only 6 mols of B is available therefore it is the limiting reagent
    (ii), Amount of 'C' formed is depends on 'B' ,
    4 mols of 'B' give 3 mols of C, the ratio is 4:3.
    Therefore, 6 mols of B will give, 6 mol of B\times \frac{3\; mol\; of\; C}{4\; mol\; of\; C}=4.5\; moles\; of\; C

    NCERT Exemplar Class 11 Chemistry Solutions Chapter 1: Matching Type

    Question:36

    Match the following:

    Column I
    Column II
    A. 88 g of CO2
    a. 0.25 mol
    B. 6.022 x 1023 molecules of H2O
    b. 2 mol
    C. 5.6 litres of O2 at STP
    c. 1 mol
    D. 96 g of O2
    d. 6.022 x 1023 molecules
    E. 1 mole of any gas
    e. 3 mol

    Answer:

    i) – b

    ii) – c

    iii) – a

    iv) - e

    v) – d




    Question:37

    Match the following physical quantities with units

    Column I (Physical)
    Column II (Unit)
    (i) Molarity
    a. g mL-1
    (ii) Mole fraction
    b. mol
    (iii) Mole
    c. Pascal
    (iv) Molality
    d. Unitless
    (v) Pressure
    e. mol L-1
    (vi) Luminous intensity
    f. Candela
    (vii) Density.
    g. mol kg-1
    (viii) Mass
    h. N m-1
    i. kg

    Answer:

    (i) – e
    (ii) – d
    (iii) – b
    (iv) – g
    (v) – c
    (vi) – f
    (vii) – a
    (viii) - i

    NCERT Exemplar Class 11 Chemistry Solutions Chapter 1: Assertion and Reason Type

    Question:38

    In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
    Assertion (A): The empirical mass of ethene is half of its molecular mass.
    Reason (R): The empirical formula represents the simplest whole number ratio of various atoms present in a compound.

    (i) Both A and R are true, and R is the correct explanation of A.
    (ii) A is true but R is false.
    (iii) A is false but R is true.
    (iv) Both A and R are false.
    Answer:

    The answer is the option (i) Both A and R are true, and R is the correct explanation of A.
    Explanation: Molecular formula = n × Empirical formula mass
    Empirical formula of ethene = CH_{2}
    Empirical formula mass of ethene = 14 amu
    =\frac{1}{2}\times mass\; of\; ethene
    Empirical formula shows that ethene has (C : H)= 1:2

    Question:39

    In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
    Assertion (A): One atomic mass unit is defined as one twelfth of the mass of one carbon- 12 atom.
    Reason (R) : Carbon-12 isotope is the most abundant isotope of carbon and has been Chosen as standard.

    (i) Both A and R are true, and R is the Correct explanation Of A.
    (ii) Both A and R are true, but R is not the correct explanation of A
    (iii) A is true but R is false.
    (iv) Both A and R are false.

    Answer:

    The answer is the option (ii) Both A and R are true, but R is not the correct explanation of A.
    Explanation: Carbon has isotopes and Carbon-12 is one of the isotopes is represented as 12C.
    12C has a mass of exactly 12 amu –(atomic mass units) and mass of all other elements are calculated with respect to this. One amu is the mass exactly of one twelfth the mass of one 12C atom.

    Question:40

    In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
    Assertion (A): Significant figures for 0.200 is 3 whereas for 200 it is 1.
    Reason (R): Zero at the end or right of a number are significant provided they are not on the right side of the decimal point.

    (i) Both A and R are true and R is correct explanation of A.
    (ii) Both A and R are true but R is not a correct explanation of A.
    (iii) A is true but R is false.
    (iv) Both A and R are false.
    Answer:

    The answer is the option (iii) A is true but R is false.
    Explanation:
    Zero's at the end of a number which does not have a decimal point, depends on the measurement.

    Question:41

    In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
    Assertion (A): Combustion Of 16 g Of methane, gives 18 g Of water.
    Reason (R): In the combustion of methane. water is one of the products.

    (i) Both A and R are true but R is not the Correct explanation Of A.
    (ii) A is true but R is false.
    (iii) A is false but R is true.
    (iv) Both A and R are false.
    Answer:

    The answer is the option (iii) A is false but R is true.
    Explanation:
    CH_{4} (g) + 2O_{2} (g) \rightarrow CO_{2} �(g) + 2H_{2}O (g)
    16g of CH4 on complete combustion will give 36g of water.

    NCERT Exemplar Class 11 Chemistry Solutions Chapter 1: Long Answer Type

    Question:42

    A vessel contains 1.6 g of dioxygen at STP (273.15K, 1 atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. Calculate
    (i) volume of the new vessel.
    (ii) number of molecules of dioxygen.

    Answer:

    P_{1}=1 \; atm
    T_{1}=273\; K
    We will be calculating V1 now,
    We know that 32 g of oxygen occupies 22.4 L of volume at STP+
    Hence, 1.6 g Of O2 will occupy,
    1.6\; g\; of\; Oxygen\times \frac{22.4\; L}{32\; g\; of\; oxygen}=1.12\; L
    Hence\; V_{1}=1.12\; L
    We know that, p_{2}=p_{1}/2=\frac{1}{2}=0.5 \; atm
    Now we must calculate V_{2}
    As per Boyle's law, P_{1}V_{1}=P_{2}V_{2}
    Therefore, V_{2}=\frac{P_{1}V_{1}}{2}
    \frac{1\; atm\times 1.12\; L}{2}=0.5\; atm\times v_{2}
    Therefore, V_{2}=2.24L
    (iii) Number of molecules of O2 that are present in the vessel,
    = 6.023\times 10^{23}\times \frac{1.6}{32}=3.011\times 10^{22}

    Question:43

    Calcium carbonate reacts with aqueous HCl to give CaCl_{2} and CO_{2} according to the reaction given below:
    CaCO_{3} (s) + 2HCl (aq) \rightarrow CaCl_{2}(aq) + CO_{2}(g) + H_{2}O (l)
    What mass of CaCl_{2} will be formed when 250 mL of 0.76 M HCl reacts with 1000 g of CaCO_{3} ? Name the limiting reagent. Calculate the number of moles of CaCl_{2} formed in the reaction.


    Answer:

    Number of moles of HCI=250\; mL\times \frac{0.76\; M}{1000}=0.19\; mol
    Given: Mass of CaCO_{3} = 1000 g
    Number of moles of CaCO_{3} = \frac{1000\; g}{100\; g}=10\; \; mol
    Referring to the equation, 1 mol of CaCO_{3} (s) needs 2 mol of HCI (aq), the ratio is 1:2.
    Hence, for 10 mol of CaCO_{3} (s), the number of moles of HCI required would be:
    10\; Mol\; CaCO_{3}\times \frac{2\; Mol\; HCl}{1\; Mol\; CaCO_{3}}=20\; Mol\; HCl (aq)
    But only 0.19 mol of HCI (aq) is available and therefore, HCI is limiting reagent.
    Amount of CaCl_{2} will depend on the amount of HCl present. 2 mol of HCl (aq), gets 1 mol of CaCl_{2}, the ratio is 2:1.
    Thus, 0.19 mol of HCl will get=0.19\; Mol\; HCl\times \frac{1\; mol\; CaCl_{2}}{2\; mol\; HCl}=0.095\; mol\; of\; CaCl_{2}
    0.095 ×molar mass of CaCl_{2}= 0.095 ×111 = 10.54 g


    Question:44

    Define the Law of multiple proportions. Explain it with two examples. How does this law point to the existence of atoms?

    Answer:

    The Law of multiple proportions states that "If two elements can combine to form more than one compound, the mass of element combines with the fixed mass of the other element and is in the ratio of small whole numbers." For example, hydrogen reacts with oxygen to form water and
    hydrogen peroxide.
    Hydrogen + Oxygen → Water
    2g 16g 18g
    Hydrogen + Oxygen → Hydrogen Peroxide
    2g 32g 34g
    Here, the masses of oxygen combine with a fixed mass of hydrogen and have a simple ratio of 16:32 or 1:2. This Law reflects that reactants always combine in fixed proportions.

    Question:45

    A box contains some identical red coloured balls, labelled as A, each weighing 2 grams. Another box contains identical blue coloured balls, labelled as B, each weighing 5 grams. Consider the combinations AB, AB2, A2B and A2B3 and show that Law of multiple proportions is applicable.

    Answer:

    Applying the Law of multiple proportions
    For the combination, AB
    1 g of A combines with \frac{5}{2}g\; of\; B=2.5g\; of\; B
    For AB2
    1 g of A combines\frac{10}{2}g\; of\; B=5g\; of\; B
    For A2B
    1 g of A combines with\frac{5}{4}g\; of\; B=1.25g\; of\; B
    For A2B2
    1 g of A combines with\frac{15}{4}g\; of\; B=3.75g\; of\; B
    Thus, it is proved that Law of multiple proportions is applicable.




    Students preparing for their examinations can make use of the NCERT Exemplar Class 11 Chemistry solutions chapter 1 PDF download feature to download a PDF to prepare for their exams, as it covers many important topics which are asked in the competitive exams. NCERT Exemplar solutions for Class 11 Chemistry chapter 1 includes the following topics:

    Main subtopics in NCERT Exemplar Class 11 Chemistry Solutions Chapter 1

    1. Importance of Chemistry

    2. Nature of matter

    3. Properties of matter and their measurement

    4. The International System of Units (S.I)

    5. Mass and weight

    6. Uncertainty in measurement

    7. Scientific notation

    8. Significant figures

    9. Dimensional Analysis

    10. Laws of Chemical Combinations

    11. Law of conservation of mass

    12. Law of definite proportions

    13. Law of Multiple Proportions

    14. Gay-Lussac’s Law

    15. Avogadro law

    16. Dalton Atomic Theory

    17. Atomic and Molecular masses

    18. Average atomic Mass

    19. Formula mass

    20. Mole Concept and Molar Mass

    21. Percentage composition

    22. Empirical Formula

    23. Stoichiometry and stoichiometric calculations

    24. Limiting Reagents

    25. Reactions in solutions

    JEE Main Highest Scoring Chapters & Topics
    Just Study 40% Syllabus and Score upto 100%
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    What Will Students Learn?

    Through NCERT Exemplar Class 11 Chemistry solutions chapter 1 Some Basic Concepts of Chemistry students will learn the basic properties of matter and also about the various S.I units that can be used. All the laws and theories such as Dalton’s Atomic Theory and Avogadro Law among others have been explained in a detailed way to form a good base for the students. The students will also get to learn and solve numerical based on topics such as molecular weight, mass concentration, and mole concept among others which will be helpful if they are preparing for competitive exams and also for their class 12.

    NCERT Exemplar Class 11 Chemistry Solutions Chapter 1 - Chapter-Wise

    Important Topics To Cover For Exams From NCERT Exemplar Class 11 Chemistry Solutions Chapter 1

    Here are the important topics that the students must specifically learn in this chapter:

    • The students will get to learn about the various parameters to denote the strength of the solution such as Molarity, Normality, Molality and their important relations. The related numerical and their solutions are given in Class 11 Chemistry NCERT Exemplar solutions chapter 1.

    • NCERT Exemplar Class 11 Chemistry solutions chapter 1 also introduces important concepts such as Dilution law, Equivalence concept, and Stoichiometry and has exercises for the revision of students.

    • Students will study various laws of chemical combination like Law of Multiple Proportion, Law of Definite proportion.

    Check Solutions of Textbook Chapters

    Chapter-1 - Some Basic Concepts of Chemistry

    Chapter-2 - Structure of Atom

    Chapter-3 - Classification of Elements and Periodicity in Properties

    Chapter-4 - Chemical Bonding and Molecular Structure

    Chapter-5 - States of Matter

    Chapter-6 - Thermodynamics

    Chapter-7 - Equilibrium

    Chapter-8 - Redox Reaction

    Chapter-9 - Hydrogen

    Chapter-10 - The S-Block Elements

    Chapter-11 - The P-Block Elements

    Chapter-12 - Organic chemistry- some basic principles and techniques

    Chapter-14 - Hydrocarbons

    Chapter-15 - Environmental Chemistry

    NCERT Exemplar Class 11 Solutions

    Read more NCERT Solution subject wise -

    Also, Read NCERT Notes subject wise -

    Also Check NCERT Books and NCERT Syllabus here:

    Frequently Asked Question (FAQs)

    1. Are the concepts given in NCERT Exemplar Class 11 Chemistry Solutions Chapter 1 easy to understand?

    Yes, the concepts are given in an easy and detailed way for the readers to understand better. 

    2. Is the chapter helpful in the preparation of JEE/NEET?

    It is an important chapter from the competition point of view. The questions regarding molarity, molality etc. are frequently asked. 

    3. Do we have to solve all the questions given after each chapter?

    For a better understanding of any concept/ chapter, one should solve all the exercises given. It helps in self-evaluation.

    4. Does it cover all the important topics?

    Yes, NCERT Exemplar Solutions for Class 11 Chemistry Chapter 1 covers all the important topics.

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    Upcoming School Exams

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    A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

    Option 1)

    0.34\; J

    Option 2)

    0.16\; J

    Option 3)

    1.00\; J

    Option 4)

    0.67\; J

    A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

    Option 1)

    2.45×10−3 kg

    Option 2)

     6.45×10−3 kg

    Option 3)

     9.89×10−3 kg

    Option 4)

    12.89×10−3 kg

     

    An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

    Option 1)

    2,000 \; J - 5,000\; J

    Option 2)

    200 \, \, J - 500 \, \, J

    Option 3)

    2\times 10^{5}J-3\times 10^{5}J

    Option 4)

    20,000 \, \, J - 50,000 \, \, J

    A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

    Option 1)

    K/2\,

    Option 2)

    \; K\;

    Option 3)

    zero\;

    Option 4)

    K/4

    In the reaction,

    2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

    Option 1)

    11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

    Option 2)

    6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

    Option 3)

    33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

    Option 4)

    67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

    How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

    Option 1)

    0.02

    Option 2)

    3.125 × 10-2

    Option 3)

    1.25 × 10-2

    Option 4)

    2.5 × 10-2

    If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

    Option 1)

    decrease twice

    Option 2)

    increase two fold

    Option 3)

    remain unchanged

    Option 4)

    be a function of the molecular mass of the substance.

    With increase of temperature, which of these changes?

    Option 1)

    Molality

    Option 2)

    Weight fraction of solute

    Option 3)

    Fraction of solute present in water

    Option 4)

    Mole fraction.

    Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

    Option 1)

    twice that in 60 g carbon

    Option 2)

    6.023 × 1022

    Option 3)

    half that in 8 g He

    Option 4)

    558.5 × 6.023 × 1023

    A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

    Option 1)

    less than 3

    Option 2)

    more than 3 but less than 6

    Option 3)

    more than 6 but less than 9

    Option 4)

    more than 9

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    An individual who is pursuing a career as a producer is responsible for managing the business aspects of production. They are involved in each aspect of production from its inception to deception. Famous movie producers review the script, recommend changes and visualise the story. 

    They are responsible for overseeing the finance involved in the project and distributing the film for broadcasting on various platforms. A career as a producer is quite fulfilling as well as exhaustive in terms of playing different roles in order for a production to be successful. Famous movie producers are responsible for hiring creative and technical personnel on contract basis.

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    Fashion Blogger

    Fashion bloggers use multiple social media platforms to recommend or share ideas related to fashion. A fashion blogger is a person who writes about fashion, publishes pictures of outfits, jewellery, accessories. Fashion blogger works as a model, journalist, and a stylist in the fashion industry. In current fashion times, these bloggers have crossed into becoming a star in fashion magazines, commercials, or campaigns. 

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    Photographer

    Photography is considered both a science and an art, an artistic means of expression in which the camera replaces the pen. In a career as a photographer, an individual is hired to capture the moments of public and private events, such as press conferences or weddings, or may also work inside a studio, where people go to get their picture clicked. Photography is divided into many streams each generating numerous career opportunities in photography. With the boom in advertising, media, and the fashion industry, photography has emerged as a lucrative and thrilling career option for many Indian youths.

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    Copy Writer

    In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook. 

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    Journalist

    Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.

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    Publisher

    For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.

    3 Jobs Available
    Vlogger

    In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion. 

    Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article. 

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    Editor

    Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.

    3 Jobs Available
    Fashion Journalist

    Fashion journalism involves performing research and writing about the most recent fashion trends. Journalists obtain this knowledge by collaborating with stylists, conducting interviews with fashion designers, and attending fashion shows, photoshoots, and conferences. A fashion Journalist  job is to write copy for trade and advertisement journals, fashion magazines, newspapers, and online fashion forums about style and fashion.

    2 Jobs Available
    Multimedia Specialist

    A multimedia specialist is a media professional who creates, audio, videos, graphic image files, computer animations for multimedia applications. He or she is responsible for planning, producing, and maintaining websites and applications. 

    2 Jobs Available
    Corporate Executive

    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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    Welding Engineer

    Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues. 

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    QA Manager
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    Production Manager
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    Product Manager

    A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

    3 Jobs Available
    Quality Controller

    A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product. 

    A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.

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    Structural Engineer

    A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software. 

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    Metrologist

    You might be googling Metrologist meaning. Well, we have an easily understandable Metrologist definition for you. A metrologist is a professional who stays involved in measurement practices in varying industries including electrical and electronics. A Metrologist is responsible for developing processes and systems for measuring objects and repairing electrical instruments. He or she also involved in writing specifications of experimental electronic units. 

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    Production Worker

    A production worker is a vital part of any manufacturing operation, as he or she plays a leading role in improving the efficiency of the production process. Career as a Production Worker  requires ensuring that the equipment and machinery used in the production of goods are designed to meet the needs of the customers.

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    AWS Solution Architect

    An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party. 

    4 Jobs Available
    QA Manager
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    Azure Administrator

    An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems. 

    4 Jobs Available
    Information Security Manager

    Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack 

    3 Jobs Available
    Computer Programmer

    Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.

    3 Jobs Available
    Product Manager

    A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

    3 Jobs Available
    ITSM Manager
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    .NET Developer

    .NET Developer Job Description: A .NET Developer is a professional responsible for producing code using .NET languages. He or she is a software developer who uses the .NET technologies platform to create various applications. Dot NET Developer job comes with the responsibility of  creating, designing and developing applications using .NET languages such as VB and C#. 

    2 Jobs Available
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