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In the extraction of chlorine by electrolysis of brine ____________.
(i) oxidation of ion to chlorine gas occurs.
(ii) reduction of ion to chlorine gas occurs.
(iii) For the overall reaction, has a negative value.
(iv) a displacement reaction takes place.
Answer:
The answer is the option (i). The oxidation reaction of ion is responsible for the extraction of chlorine from brine
The for this reaction is
Question:2
When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains ____________.
(i) sulphides of copper (II) and iron (II)
(ii) sulphides of copper (II) and iron (III)
(iii) sulphides of copper (I) and iron (II)
(iv) sulphides of copper (I) and iron (III)
Answer:
The answer is the option (iii). Inside a reverberatory furnace iron silicate on mixing copper ore with silica in a reverberatory furnace, iron silicate comes off as slag producing copper in the form of copper matte containing copper sulphide and some iron sulphide
Question:3
Which of the following reactions is an example of autoreduction ?
(i)
(ii)
(iii)
(iv)
Answer:
In this reaction reduction of copper (I) oxide by copper (I) sulphide takes place. Since, copper is reduced by itself, this process is known as auto-reduction and the solidified copper so, obtained is known as blister copper. We get the copper metal on reaction of sulphide ore of copper with its oxide.
Question:4
A number of elements are available in earth’s crust but most abundant elements are ____________.
(i)
(ii)
(iii)
(iv)
Answer:
The answer is the option (i). A number of elements are available in the earth’s crust but the most abundant elements in the earth’s crust include .
Question:5
Zone refining is based on the principle that ___________.
(i) impurities of low boiling metals can be separated by distillation.
(ii) impurities are more soluble in molten metal than in solid metal.
(iii) different components of a mixture are differently adsorbed on an absorbent.
(iv) vapours of the volatile compound can be decomposed in pure metal.
Answer:
The answer is the option (ii). The basic principle of zone refining method is that impurities are more soluble in molten metal compared to the solid state of the metal.
Question:6
In the extraction of copper from its sulphide ore, the metal is formed by the reduction of with
Answer:
The answer is the option (iii). In the process of extraction of copper from its sulphide ore, the metal is formed by the reduction of with
Since, copper is reduced by itself the process is known as autoreduction.
Chemical reaction occuring in this reaction is
In this process, copper appears as blister copper.
Question:7
Brine is electrolysed by using inert electrodes. The reaction at anode is ________.
(i)
(ii)
(iii)
(iv)
Answer:
The answer is the option (i). Electrolysis of brine solution is a process of decomposition of solution using the electric current. Anode is positive; therefore it attracts negative hydroxide and chlorine ions. Chloride ions get oxidized by electron loss to chlorine molecules.
Question:8
In the metallurgy of aluminium ________________.
(i) is oxidised to
.
(ii) graphite anode is oxidised to carbon monoxide and carbon dioxide.
(iii) the oxidation state of oxygen changes in the reaction at the anode.
(iv) the oxidation state of oxygen changes in the overall reaction involved in the process
Answer:
The answer is the option (ii). The graphite anode is oxidized to carbon monoxide and carbon dioxide
in the process of metallurgy of aluminium .
Question:9
Electrolytic refining is used to purify which of the following metals?
Answer:
The answer is the option (i). Copper and zinc can be purified by using electrolyte refining method. In this process, impure metal acts as anode and a strip of pure metal is used as a cathode. Impurities from the blister copper or impure zinc deposit are used as anode mud. The electrolytic refining of copper and zinc is done to get high grade metals.
Question:10
Extraction of gold and silver involves leaching the metal with ion. The metal is recovered by ________________.
(i) displacement of metal by some other metal from the complex ion.
(ii) roasting of the metal complex.
(iii) calcination followed by roasting.
(iv) thermal decomposition of the metal complex.
Answer:
The answer is the option (i). Extraction of gold and silver involves leaching with ion. The metal in cyanide process is recovered by displacement of metal by some other metal from the complex ion. The reaction taking place is as:
Question:11
Answer the questions 11-13 on the basis of Fig. 6.1.
Choose the correct option of temperature at which carbon reduces to iron and produces
.
(i) Below temperature at point A.
(ii) Approximately at the temperature corresponding to point A.
(iii) Above temperature at point A but below a temperature at point D.
(iv) Above temperature at point A.
Answer:
The answer is the option (iv)
It can be seen as a couple of two simpler reactions
Total Gibbs energy change becomes
In versus T plot, the plot
to
goes upward and the plot for
to
goes downwards.
At temperature above point A, the to
lines comes below
to
and
So in this range, will reduce
to
and itself be oxidised to
.
Question:12
Below point ‘A’ can ______________.
(i) be reduced by carbon monoxide only.
(ii) be reduced by both carbon monoxide and carbon.
(iii) be reduced by carbon only.
(iv) not be reduced by both carbon and carbon monoxide.
Answer:
The answer is the option (i). Below point A, can be reduced by carbon monoxide only.
Question:13
For the reduction of at the temperature corresponding to point D, which of the following statements is correct?
(i) value for the overall reduction reaction with carbon monoxide is zero.
(ii) value for the overall reduction reaction with a mixture of 1 mol carbon and 1 mol oxygen is positive.
(iii) value for the overall reduction reaction with a mixture of 2 mol carbon and 1 mol oxygen will be positive.
(iv) value for the overall reduction reaction with carbon monoxide is negative.
Answer:
The answer is the option (i). At point D, the curves of oxidation of iron and oxidation of intersect each other.
Thus, for the reaction
is zero.
Resulting in
Question:14
At the temperature corresponding to which of the points in Fig.6.1, will be reduced to
by coupling the reaction
with all of the following reactions?
(i)
(ii) and
(iii)
(i) Point A
(ii) Point B
(iii) Point D
(iv) Point E
Answer:
The answer is the option (ii, iv) The reduction reaction ranges can be determined from the intersection points on versus T plots.
The reduction of to
takes place at point B and E because at these points
value of all three oxidation reactions is lesser than that of reduction reaction.
Question:15
Which of the following option are correct?
(i) Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast.
(ii) In the extraction of silver, silver is extracted as cationic complex.
(iii) Nickel is purified by zone refining.
(iv) and are purified by van Arkel method
Answer:
The answer is the option (i, iv) Iron obtained from blast containing about 4% carbon and many impurities such as Mn, P, Si, etc is called pig iron. It is remelted with scrap iron to obtain cast iron which has slightly less carbon content (3%) compared to pig iron and is extremely hard and brittle.
For refining of Van Arkel method based on the thermal decomposition of metal components is used. In this method, the impurities i.e. oxygen and nitrogen are removed by heating metal in an evacuated vessel with iodine.
Zone refining is used for semiconductors like Ge, Si. For purification of Nickel, Mond’s process is used.
Question:16
In the extraction of aluminium by Hall-Heroult process, purified is mixed with
to
(i) lower the melting point of
(ii) increase the conductivity of molten mixture.
(iii) reduce into Al(s).
(iv) acts as a catalyst
Answer:
The answer is the option (i, ii) Purified is mixed with
in Hall-Heroult process to lower the melting point of
and increase the conductivity of the molten mixture. Hence, option a and b are correct.
Question:17
Which of the following statements is correct about the role of substances added in the froth floatation process?
(i) Collectors enhance the non-wettability of the mineral particles.
(ii) Collectors enhance the wettability of gangue particles.
(iii) By using depressants in the process two sulphide ores can be separated.
(iv) Froth stabilisers decrease wettability of gangue.
Answer:
The answer is the option (i, iii) To enhance the non-wettability of mineral particles as well as froth stabilisers, collectors like sodium ethyl xanthate are used.
For example, sodium cyanide acts as a depressant for zinc sulphide in the process of concentration of galena ore. Depressants can be used for the separation of two sulphide ores.
Froth stabilizers are used to stabilize the froth in the process.
Question:18
In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by ______________.
(i) using collectors.
(ii) adjusting the proportion of oil to water.
(iii) using depressant.
(iv) using froth stabilisers.
Answer:
The answer is the option (ii, iii) Froth floatation method is used in extraction of metal from sulphide ore. The two sulphide ores can be separated by using depressant and adjusting the proportion of oil to water in the froth floatation process. Depressant used in separation of zinc sulphide and lead sulphide is . It is utilized in selective prevention of
from coming to the froth.
Question:19
Common impurities present in bauxite are ____________.
(i)
(ii)
(iii)
(iv)
Answer:
The answer is the option (iii, iv) some of the major impurities in bauxite are iron oxides (goethite and hematite), silicon dioxide, kaolinite and small amounts of anatase.
Question:20
Which of the following ores are concentrated by froth flotation?
(i) Haematite
(ii) Galena
(iii) Copper pyrites
(iv) Magnetite
Answer:
The answer is the option (ii, iii) Sulphide ores are concentrated by froth floatation process as pine oil selectively wets the sulphide ore. Galena and copper pyrite, being sulphide ores are concentrated by froth floatation process.
Question:21
Which of the following reactions occur during calcination?
(i)
(ii)
(iii)
(iv)
Answer:
The answer is the option (i, iii). In the process of calcination, heating of the ore below its melting in limited supply of air takes place. Ores that contain oxygen like oxide, hydroxides or carbonates are calcined. The reaction that takes place is:
Question:22
For the metallurgical process of which of the ores calcined ore can be reduced by carbon?
(i) haematite
(ii) calamine
(iii) iron pyrites
(iv) sphalerite
Answer:
The answer is the option (i, ii). Oxides reduction can be done by using carbon. Haematite (Iron ore - ) and calamine
contain oxygen, so they can be reduced by carbon.
Sulphide ores cannot be reduced by carbon. Iron pyrite and sphalerite are sulphide ores of iron and zinc respectively.
Question:23
The main reactions occurring in the blast furnace during the extraction of iron from haematite are ________.
(i)
(ii)
(iii)
(iv)
Answer:
The answer is the option (i, iv). The 2 main reactions taking place in blast furnace during extraction of iron are:
(i) Reduction of
(ii) Slag formation
Question:24
In which of the following method of purification, metal is converted to its volatile compound which is decomposed to give pure metal?
(i) heating with a stream of carbon monoxide.
(ii) heating with iodine.
(iii) liquation.
(iv) distillation.
Answer:
The answer is the option (i,ii)
(i) Heating of metal with stream of
(ii) Heating with Iodine
Question:25
Which of the following statements are correct?
(i) A depressant prevents a certain type of particle to come to the froth.
(ii) Copper matte contains and
(iii) The solidified copper obtained from the reverberatory furnace has blistered appearance due to evolution of during the extraction.
(iv) Zinc can be extracted by self-reduction.
Answer:
The answer is the option (i, iii). Frothing of a particular sulphide can be prevented by depressants. The solidified copper that we get in reverberatory furnace has blistered appearance due to evolution of during extraction. Hence, it is called blister copper.
Question:26
In the extraction of chlorine from brine _____________.
(i) for the overall reaction is negative.
(ii) for the overall reaction is positive.
(iii) for the overall reaction has negative value.
(iv) for the overall reaction has positive value.
Answer:
The answeris the option (ii,iii). for the reaction is
Using we get
Question:27
Why is an external emf of more than 2.2V required for the extraction of from brine?
Answer:
In the process of extraction of from brine solution :
the value of
is
For this the value of is
or
Hence, An external emf more than 2.20 V is required for extraction of from brine solution for electrolysis process.
Question:28
As per Ellingham diagram at temperature greater than 1073 K, for the formation
is less negative than
for the formation of carbon monoxide from carbon.
Thus, above 1073 K, carbon can reduce , i.e.,
for the reaction
Question:29
Wrought iron is an alloy with a very low carbon content (less than 0.08%).
The reaction is:
In extraction of cast iron from haematite ore, on addition of limestone as flux, the impurities of sulphur, silicon and phosphorus pass into slag on changing to their oxides.
Question:30
How is copper extracted from low-grade copper ores?
Answer:
Copper is extracted from low grade ores by the process of hydrometallurgy. Acid or bacteria is used in its leaching process. In the process, ore is treated with a suitable regent that dissolves ore but not the impurities. Scrap iron, zinc or is used to treat the solution containing copper ions
and the reactions are as:
In this way, copper, is obtained.
Question:31
Write two basic requirements for refining of metal by Mond process and by Van Arkel Method
Answer:
Mond’s process and van arkel method are used for refining of nickel and zinc, respectively. The basic requirements for both the processes are:
(i) A volatile compound should be formed by the metal on reaction with an available reagent.
(ii) The volatile compound formed should be easily decomposable, enabling the metal to be easily recovered.
Question:32
Despite being better reducing agents, carbon and hydrogen are not used as carbon and hydrogen form carbides and hydrides respectively on reaction with metals at high temperature.
Question:33
How do we separate two sulphide ores by Froth Floatation Method? Explain with an example.
Answer:
The separation of two sulphide ores is done by adjusting proportion of oil to water or by using depressants. is used for an ore containing
and
. Sodium cyanide forms complex with
and prevents it from coming with froth but lead sulphide remains with froth.
Question:34
Haematite is used to line the furnace. It supplies the oxygen and oxidises impurities present in the cast iron like carbon, silicon, manganese and phosphorus to
and
.
and
escape and
combine to form to form manganous silicate
as slag
(Manganous silicate-slag)
Question:35
Compound B is more readily adsorbed on the column as compound A is eluted in preference to compound B
Question:36
Why is sulphide ore of copper heated in a furnace after mixing with silica?
Answer:
Iron oxide that is present as impurity in sulphide ore of copper forms an iron silicate slag and copper is produced in the form of copper matte. This is why, sulphide ore of copper is heated in a furnace after mixing with silica.
Question:37
Why are sulphide ores converted to oxide before reduction?
Answer:
Sulphides are not reduced easily unlike the oxides. This is why, sulphides are first oxidised and then subjected to reduction.
Question:38
Which method is used for refining ? Explain with equation.
Answer:
Van Arkel method is used in refining of . The crude metal, on heating with iodine forms volatile unstable compound. Pure metal is then obtained by decomposing the compound.
The equations are :
Question:39
What should be the considerations during the extraction of metals by electrochemical method?
Answer:
During the extraction of metals by electrochemical method we should keep in mind the following factors
(i) Reactivity of the metal.
(ii) Suitability of the electrode.
Question:40
What is the role of flux in metallurgical processes?
Answer:
Flux is a chemical cleaning agent.
The ores contain some gangue even after concentration. Certain substances are mixed with concentrated ore for the purpose of removing the gangue. They combine with the gangue to form a fusible material that is insoluble in molten metal. These substances are called fluxes. Some examples of materials used as flux: Limestone, silica, dolomite, lime, borax etc.
Fluxes are classified as acidic or basic based on the type of impurities they remove.
Question:41
How are metals used as semiconductors refined? What is the principle of the method used?
Answer:
Semiconductor like silicon and germanium is produced by zone refining method and the principle used is that the impurities are more soluble in melt than the corresponding solid state of metals.
Question:42
Answer:
The reactions that take place in blast furnace during the metallurgy of iron at the temperature range 500-800 K are:
Question:43
Give two requirements for vapour phase refining.
Answer:
The two requirements for vapour phase refining are:
(i) A volatile compound should be formed by the metal on reaction with an available reagent.
(ii) The volatile compound formed should be easily decomposable, enabling the metal to be easily recovered.
Question:44
In extraction of gold by cyanide process, gold particles present in the ore are treated with a dilute solution of in the presence of atmospheric oxygen. Gold particles dissolve by forming complex cyanide that is soluble in nature.
On adding electropositive metal like zinc Au is recovered from solution.
The process of extraction of gold by cyanide oxidation as well as reduction. oxidation of gold takes place during the formation of cyanide complex whereas reduction takes place during its recovery. acts as a reducing agent.
Question:45
Match the items of Column I with items of Column II and assign the correct code:
Column I | Column II |
(A) Pendulum | (1) Chrome steel |
(B) Malachite | (2) Nickel steel |
(C) Calamine | (3) |
(D) Cryolite | (4) |
(5) |
(i) A (1) B (2) C (3) D (4)
(ii) A (2) B (4) C (5) D (3)
(iii) A (2) B (3) C (4) D (5)
(iv) A (4) B (5) C (3) D (2)
Answer:
Option (ii) is the answer.
Question:46
Match the items of Column I with the items of Column II and assign the correct code :
Column I | Column II |
(A) Coloured bands | (1) Zone refining |
(B) Impure metal to volatile complex | (2) Fractional distillation |
(C) Purification of | (3) Mond Process |
(D) Purification of mercury | (4) Chromatography |
(5) Liquation |
(i) A (1) B (2) C (4) D (5)
(ii) A (4) B (3) C (1) D (2)
(iii) A (3) B (4) C (2) D (1)
(iv) A (5) B (4) C (3) D (2)
Answer:
Option (ii) is the answer.
Question:47
Match items of Column I with the items of Column II and assign the correct code :
Column I | Column II |
(A) Cyanide process | (1) Ultrapure Ge |
(B) Froth Floatation Process | (2) Dressing of |
(C) Electrolytic reduction | (3) Extraction of |
(D) Zone refining | (4) Extraction of |
(5) Purification of |
(i) A (4) B (2) C (3) D (1)
(ii) A (2) B (3) C (1) D (5)
(iii) A (1) B (2) C (3) D (4)
(iv) A (3) B (4) C (5) D (1)
Answer:
Option (i) is the answer.
Question:48
Match the items of Column I with the items of Column II and assign the correct code:
Column I | Column II |
(A) Sapphire | (1) |
(B) Sphalerite | (2) |
(C) Depressant | (3) |
(D) Corundum | (4) |
(5) |
(i) A (3) B (4) C (2) D (1)
(ii) A (5) B (4) C (3) D (2)
(iii) A (2) B (3) C (4) D (5)
(iv) A (1) B (2) C (3) D (4)
Answer:
Option (i) is the answer.
Question:49
Match the items of Column I with items of Column II and assign the correct code :
Column I | Column II |
(A) Blistered | (1) Aluminium |
(B) Blast furnace | (2) |
(C) Reverberatory furnace | (3) Iron |
(D) Hall-Heroult proess | (4) |
(5) |
(i) A (2) B (3) C (4) D (1)
(ii) A (1) B (2) C (3) D (5)
(iii) A (5) B (4) C (3) D (2)
(iv) A (4) B (5) C (3) D (2)
Answer:
Option (i) is the answer.
Question:50
In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Nickel can be purified by Mond process.
Reason: is a volatile compound which decomposes at 460K to give pure
.
(i) Both assertion and reason are true and the reason is the correct explanation of assertion.
(ii) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(iii) The assertion is true but the reason is false.
(iv) The assertion is false but the reason is true.
(v) Assertion and reason both are wrong.
Answer:
The answer is the option (i). For Mond’s process, the pre-requisites include:
(i) A volatile compound should be formed by the metal on reaction with an available reagent.
(ii) The volatile compound formed should be easily decomposable, enabling the metal to be easily recovered. is a volatile compound which decomposes to give pure nickel on heating at 460 K while
(Carbon monoxide) is removed as gas.
Question:51
In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Zirconium can be purified by Van Arkel method.
Reason: is volatile and decomposes at 1800K.
(i) Both assertion and reason are true and the reason is the correct explanation of assertion.
(ii) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(iii) The assertion is true but the reason is false.
(iv) The assertion is false but the reason is true.
(v) Assertion and reason both are wrong.
Answer:
The answer is the option (i). Zirconium is also purified by Van Arkel method as it forms on treating with iodine and is easily decomposable to get pure zirconium.
Question:52
In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Sulphide ores are concentrated by Froth Flotation method.
Reason: Cresols stabilise the froth in the Froth Flotation Method.
(i) Both assertion and reason are true and the reason is the correct explanation of assertion.
(ii) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(iii) The assertion is true but the reason is false.
(iv) The assertion is false but the reason is true.
(v) Assertion and reason both are wrong.
Answer:
The answer is the option (ii). Sulphide ores on being wetted by oil, becomes lighter and rises to the surface along with froths. On the other hand, impurities wetted by water settle down as they get heavier.
Question:53
In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Zone refining method is very useful for producing semiconductors.
Reason: Semiconductors are of high purity.
(i) Both assertion and reason are true and the reason is the correct explanation of assertion.
(ii) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(iii) The assertion is true but the reason is false.
(iv) The assertion is false but the reason is true.
(v) Assertion and reason both are wrong.
Answer:
The answer is the option (ii).The principle of the zone refining method is that the the impurities of semiconductors are more soluble in the molten zone compared to the solid state and the ultrapure semiconductor crystallizes.
Question:54
In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal.
Reason: Copper is extracted by hydrometallurgy.
(i) Both assertion and reason are true and the reason is the correct explanation of assertion.
(ii) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(iii) The assertion is true but the reason is false.
(iv) The assertion is false but the reason is true.
(v) Assertion and reason both are wrong.
Answer:
The answer is the option (ii). Copper is extracted by hydrometallurgical process. Suitable solvent like water is used for dissolving salts of metal. They are then reduced by more electropositive element in this process.
Question:55
(i) As per the Ellingham diagram, below 710 K
Hence, is better reducing agent compared to
.
At temperature above 710 K,
Hence is better reducing agent.
(ii) Sulphide ores cannot be reduced easily but oxide ores can be esily reduced compared to them, hence sulphide ores are generally converted into oxides before reduction
(iii) In addition to copper sulphide, copper pyrites contain iron sulphide. In reverberatory furnace copper ore is roasted to give oxides. is removed by adding silica from the matte containing copper sulphide and some iron sulphide.
(iv) Carbon and hydrogen react with metals at high temperature to form carbides and hydrides respectively hence they are not used as reducing agents.
(v) reacts with iodine to form
which is volatile and decomposes to give
at high temperature to give extra pure titanium. That is why vapour phase refining method is used for purification of
Also, check NCERT solutions for class 12, other subjects
Introduction of NCERT exemplar Class 12 Chemistry solutions chapter 6 Principles and Processes of isolation of elements
The GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS is very important as it deals with general principles and process of isolation of elements, which deals with metallurgy and oxidation. The extraction and isolation of metals from ores involve major steps that are included in this chapter.
As per NCERT exemplar Class 12 Chemistry solutions chapter 6, the chapter deals with learning about the different metals, their principles, oxidation-reduction, and refining. There are different topics in this chapter that will help you to understand the concept of metallurgy. The chapter will help the students in understanding the working of different elements related to metallurgy and how it is used.
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In Class 12 Chemistry NCERT exemplar solutions chapter 6 the students will get to know about various topics that they should know when it comes to general principles and processes of isolation of elements. The main topics covered in this chapter are definition of minerals, ore, gangue, metallurgy and different important sub topics. Every topic covered in this NCERT exemplar for Class 12 Chemistry chapter 6 solutions is very well equipped with all the answers and also correctly explained.
The entire scientific and technological process used for isolation of the metal from its ores is known as metallurgy. The most abundant metal found in the Earth’s crust is Aluminium. This chapter will help you to understand and gather all the knowledge related to metallurgy and the isolation of elements. Overall, NCERT exemplar Class 12 Chemistry solutions chapter 6 along with just giving information is also fun and interesting for all the students who wish to learn more about isolation of elements. This chapter is helpful for them who wish to study the subject very deeply.
- The importance and use of metallurgy elements and the isolation of elements. There are different factors that are related to each other. Everything related to metallurgy is mentioned in the NCERT exemplar Class 12 Chemistry solutions chapter 6.
- NCERT Exemplar Class 12 Chemistry chapter 6 solutions include different aspects of the chapters that will help and control the use of the elements and they can be different based on its use. The chapter will help you to understand all the concepts with a broad perspective and also help you clear your doubts.
- The chapter also provides important information about the different topics that are included in this chapter. It encompasses the relevant and fairly detailed different diagrams that will help the students in getting a better and clear understanding for the students.
Chapter 1 | |
Chapter 2 | |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | General Principles and Processes of isolation of elements |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | |
Chapter 15 | |
Chapter 16 |
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You can use them people also used problem
Hi,
The Medhavi National Scholarship Program, under the Human Resources & Development Mission (HRDM), offers financial assistance to meritorious students through a scholarship exam. To be eligible, candidates must be between 16 and 40 years old as of the last date of registration and have at least passed the 10th grade from a recognized board. Higher qualifications, such as 11th/12th grade, graduation, post-graduation, or a diploma, are also acceptable.
To apply, download the Medhavi App from the Google Play Store, sign up, and read the detailed notification about the scholarship exam. Complete the registration within the app, take the exam from home using the app, and receive your results within two days. Following this, upload the necessary documents and bank account details for verification. Upon successful verification, the scholarship amount will be directly transferred to your bank account.
The scholarships are categorized based on the marks obtained in the exam: Type A for those scoring 60% or above, Type B for scores between 50% and 60%, and Type C for scores between 40% and 50%. The cash scholarships range from Rs. 2,000 to Rs. 18,000 per month, depending on the exam and the marks obtained.
Since you already have a 12th-grade qualification with 84%, you meet the eligibility criteria and can apply for the Medhavi Scholarship exam. Preparing well for the exam can increase your chances of receiving a higher scholarship.
hello mahima,
If you have uploaded screenshot of your 12th board result taken from CBSE official website,there won,t be a problem with that.If the screenshot that you have uploaded is clear and legible. It should display your name, roll number, marks obtained, and any other relevant details in a readable forma.ALSO, the screenshot clearly show it is from the official CBSE results portal.
hope this helps.
Hello Akash,
If you are looking for important questions of class 12th then I would like to suggest you to go with previous year questions of that particular board. You can go with last 5-10 years of PYQs so and after going through all the questions you will have a clear idea about the type and level of questions that are being asked and it will help you to boost your class 12th board preparation.
You can get the Previous Year Questions (PYQs) on the official website of the respective board.
I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.
Thank you and wishing you all the best for your bright future.
Hello student,
If you are planning to appear again for class 12th board exam with PCMB as a private candidate here is the right information you need:
Remember
, these are tentative dates based on last year. Keep an eye on the CBSE website ( https://www.cbse.gov.in/ ) for the accurate and official announcement.
I hope this answer helps you. If you have more queries then feel free to share your questions with us, we will be happy to help you.
Good luck with your studies!
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