A pair of metals among the following that can be purified by the van Arkel method are:

1. Zr,  and Ti

2. Ag, and Au

3. Ni,  and Fe

4. Ga, and In

Subtopic:  Metallurgy of individual elements | Refining Process |
 94%
From NCERT
NEET - 2011
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4M + 8CN+ 2H2O + O2 4[M(CN)2]+ 4OH-

2[M(CN)2]+ Zn[Zn(CN)4]2- + 2M

The metal M in above-mentioned reaction is:

1. Nickel

2. Silver

3. Copper

4. Mercury

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 89%
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The extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by:

1. Liquation

2. Distillation

3. Zone refining

4. Displacement with Zn

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements | Refining Process |
 85%
From NCERT
NEET - 2017
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A major impurity in pig iron is:

1. Carbon

2. Silicon

3. Phosphorus

4. Manganese

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 84%
From NCERT
AIPMT - 2011
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In the extraction of aluminium by the Hall-Heroult process, purified Al2O3 is mixed with CaF2 to:

a. Lower the melting point of Al2O3
b. Increase the conductivity of the molten mixture.
c. Reduce Al3+into Als
d. Act as a catalyst

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d

Subtopic:  Metallurgy of individual elements |
 78%
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Aluminium is extracted from alumina Al2O3 by electrolysis of a molten mixture of:

1. Al2O3+HF+NaAlF4

2. Al2O3+CaF2+NaAlF4

3. Al2O3+Na3AlF6+CaF2

4. Al2O3+KF+Na3AlF6

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 78%
From NCERT
AIPMT - 2012
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Brine is electrolysed by using inert electrodes. The reaction at the anode is:

1. Cl-(aq) → \(\frac{1}{2}\)Cl2(g) + e-\(E_{cell}^{o}\) = 1.36 V

2. 2H2O(l) → O2(g) + 4H+ +  4 e-;  \(E_{cell}^{o}\) = 1.23 V

3. Na+(aq) + e- → Na(s); \(E_{cell}^{o}\) = 2.71 V

4. H+(aq) + e-\(\frac{1}{2}\)H2(g); \(E_{cell}^{o}\) = 0.00 V

Subtopic:  Metallurgy of individual elements |
 76%
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The common impurities present in bauxite are:

a. CuO                    

b. ZnO                

c. Fe2O3                

d. SiO2

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d

Subtopic:  Metallurgy of individual elements |
 75%
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Which of the following metals can be purified by electrolytic refining?

1. Cu, and Zn     

2. Ge, and Si     

3. Zr, and Ti     

4. Zn, and Hg

Subtopic:  Metallurgy of individual elements |
 74%
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The correct match among the following is:

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
 
(a) (b) (c) (d)
1. (iv) (iii) (i) (ii)
2. (iv) (iii) (ii) (i)
3. (ii) (i) (iv) (iii)
4. (iii) (iv) (i) (ii)
Subtopic:  Metallurgy of individual elements | Refining Process |
 75%
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