Select the correct option based on statements below:
Assertion (A): The zone refining method is very useful for producing semiconductors.
Reason (R): Semiconductors are of high purity.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Refining Process |
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Select the correct option based on the statements below:
Assertion (A): Zirconium can be purified by the van Arkel method.
Reason (R): ZrI4 is volatile and decomposes at 1800 K.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Refining Process |
 81%
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Select the correct option based on statements below:
Assertion (A): Nickel can be purified by Mond’s process.
Reason (R): It is a volatile compound that decomposes at 460 K to give pure Ni.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Refining Process |
 80%
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Among statements (I) – (IV), the correct ones are-

(I) Limestone is decomposed to CaO during the extraction of iron from its oxides
(II) In the extraction of silver, silver is extracted as an anionic complex
(III) Nickel is purified by Mond's process
(IV) Zr and Ti are purified by the Van Arkel method


1. (III) and (IV) only
2. (I), (III), and (IV) only
3. (II), (III), and (IV) only
4. (I), (II), (III), and (IV)

Subtopic:  Metallurgy of individual elements | Refining Process |
 64%
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From the following, the correct statements about the role of substances added in the froth flotation process are:

a. Collectors enhance the non-wettability of the mineral particles.
b. Collectors enhance the wettability of gangue particles.
c. By using depressants in the process, two sulphide ores can be separated.
d. Froth stabilisers decrease the wettability of gangue.


1. a and b
2. b and c
3. c and d
4. a and c

Subtopic:  Refining Process |
 62%
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Which of the following statement is correct?  

1. Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast.
2. In the extraction of silver, silver is extracted as a cationic complex.
3. Nickel is purified by zone refining.
4. Zr, and Ti are purified by the van Arkel method.


1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Subtopic:  Refining Process |
 84%
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Match the items in Column I with the items in Column II, and assign the correct code.

Column I Column II
A. Cyanide process 1. Ultrapure Ge
B. Froth flotation process 2. Dressing of ZnS
C. Electrolytic reduction 3. Extraction of Al
D. Zone refining 4. Extraction of Au

5. Purification of Ni

 Codes

A B C D
1. 4 2 3 1
2. 2 3 1 5
3. 1 2 3 4
4. 3 4 5 1

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Refining Process |
 84%
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Match the items in Column I with the items in 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 Ge and Si 3. Mond’s process
D. Purification of mercury 4. Chromatography

5. Liquation

 Codes

A B C D
1. 1 2 3 4
2. 4 3 1 2
3. 3 4 2 1
4. 5 4 3 2

Subtopic:  Refining Process |
 92%
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Match the elements in Column I with methods of purification in Column II.

     Column I       Column II

(a) Boron             (i) Van Arkel method

(b) Tin                 (ii) Mond's process

(c) Zirconium       (iii) Liquation

(d) Nickel            (iv) Zone refining

(1) (a)-(iv) (b)-(iii) (c)-(i) (d)-(ii)

(2) (a)-(iv) (b)-(iii) (c)-(ii) (d)-(i)

(3) (a)-(ii) (b)-(i) (c)-(iv) (d)-(iii)

(4) (a)-(iii) (b)-(iv) (c)-(i) (d)-(ii)

Subtopic:  Metallurgy of individual elements | Refining Process |
 73%
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