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NCERT Exemplar · Class 12 · Chemistry

Chapter 6: General Principles and Processes of Isolation of Elements

Practice each question, then open the answer or worked solution.

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questions.

10 questions
Q45Multiple choice

Match the items of Column I with items of Column II and assign the correct code:

Column I

(A) Pendulum

(B) Malachite

(C) Calamine

(D) Cryolite

Column II

(1) Chrome steel

(2) Nickel steel

(3) Na3AlF6

(4) CuCO3.Cu(OH)2

(5) ZnCO3

Code :

Show answerHide answer
Correct option: B
Show solutionHide solution
Worked solution

Option (ii) is the answer.

Q46Multiple choice

Match the items of Column I with the items of Column II and assign the correct

code :

Column I

(A) Coloured bands

(B) Impure metal to volatile complex

(C) Purification of Ge and Si

(D) Purification of mercury

Column II

(1) Zone refining

(2)Fractional distillation

(3) Mond Process

(4) Chromatography

(5) Liquation

Code :

Show answerHide answer
Correct option: B
Show solutionHide solution
Worked solution

Option (ii) is the answer.

Q47Multiple choice

Match items of Column I with the items of Column II and assign the correct

code :

Column I

(A) Cyanide process

(B) Froth Floatation Process

(C) Electrolytic reduction

(D) Zone refining

Column II

(1) Ultrapure Ge

(2) Dressing of ZnS

(3) Extraction of Al

(4) Extraction of Au

(5) Purification of Ni

Code :

Option (i) is the answer.

Show solutionHide solution
Worked solution

Solution coming soon.

Q48Multiple choice

Match the items of Column I with the items of Column II and assign the correct

code :

Column I

(A) Sapphire

(B) Sphalerite

(C) Depressant

(D) Corundum

Column II

(1) Al2O3

(2) NaCN

(3) Co

(4) ZnS

(5) Fe2O3

Code :

Show answerHide answer
Correct option: A
Show solutionHide solution
Worked solution

Option (i) is the answer.

Q49Multiple choice

Match the items of Column I with items of Column II and assign the correct

code :

Column I

(A) Blistered Cu

(B) Blast furnace

(C) Reverberatory furnace

(D) Hall-Heroult process

Column II

(1) Aluminium

(2) 2Cu2O + Cu2S → 6Cu + SO2

(3) Iron

(4) FeO + SiO2 → FeSiO3

(5) 2Cu2S + 3O2→ 2Cu2O + 2SO2

Code :

Show answerHide answer
Correct option: A
Show solutionHide solution
Worked solution

Option (i) is the answer.

V. Assertion and Reason Type

Note: In the following questions a statement of assertion followed by a

statement of reason is given. Choose the correct answer out of the following

choices.

(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.

Q50Written answer

Assertion: Nickel can be purified by the Mond process.

Reason: Ni (CO)4

is a volatile compound which decomposes at 460K

to give pure Ni.

Show solutionHide solution
Worked solution

Option (i) is correct.

Q51Written answer

Assertion: Zirconium can be purified by Van Arkel method.

Reason: ZrI4

is volatile and decomposes at 1800K.Solution:

Option (i) is correct.

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Worked solution

Solution coming soon.

Q52Written answer

Assertion: Sulphide ores are concentrated by Froth Flotation method.

Reason: Cresols stabilise the froth in the Froth Flotation Method.

Show solutionHide solution
Worked solution

Option (ii) is correct.

Q53Written answer

Assertion: Zone refining method is very useful for producing

semiconductors.

Reason: Semiconductors are of high purity.

Show solutionHide solution
Worked solution

Option (ii) is correct.

Q54Written answer

Assertion: Hydrometallurgy involves dissolving the ore in a suitable reagent

followed by precipitation by a more electropositive metal.

Reason: Copper is extracted by hydrometallurgy.

Show solutionHide solution
Worked solution

Option (ii) is correct.

Class 12 Chemistry NCERT Exemplar for General Principles and Processes of Isolation of Elements

The chapter General Principles and Processes of Isolation of Elements teaches students about different terms like minerals, calcination, concentration, good deed, roasting, ores and refining. They also learn the principles of oxidation and reduction as applied to the extraction procedures.
The Important Concepts in Chapter 6 General Principles and Processes of Isolation of Elements

  1. Occurrence of Metals
  2. The Concentration of Ores: Hydraulic Washing, Magnetic Separation, Froth Flotation Method and Leaching
  3. Extraction of Crude Metal from Concentrated Ore
  4. Thermodynamic Principles of Metallurgy and Applications
  5. Electrochemical Principles of Metallurgy, Oxidation-Reduction and Refining,
  6. Uses of Aluminium, Copper, Zinc and Iron

The NCERT Exemplar Class 12 Chapter 6 General Principles and Processes of Isolation of Elements is provided here. Click the below link to download the PDF.