Nickel is purified by thermal decomposition of its:

(1) Hydride

(2) Chloride

(3) Azide

(4) Carbonyl

Subtopic:  Refining Process |
 77%
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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%
From NCERT
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In the metallurgy of copper, the slag is 

1. FeSiO3

2. CaCO3

3. CaSiO3

4. CaO

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 76%
From NCERT
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Galena contains ZnS with PbS. Which of the following is used as depressant to stop ZnS to come with foam?

1. NaCN

2. Aniline

3. Pine Oil

4. H2O

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 86%
From NCERT
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Vapour phase refining can be carried out in case of 

1. Ni

2. Zr

3. Ti

4. All of these

Subtopic:  Refining Process |
 90%
From NCERT
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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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Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of

1. Al2O+ HF + NaAlF4

2. Al2O3 + CaF2 + NaAlF4

3. Al2O3 + Na3AlF6 + CaF2

4. Al2O3 + KF +Na3AlF6

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 85%
From NCERT
NEET - 2012
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Which one of the following is a mineral of iron?
(a) Malachite
(b) Cassiterite
(c) Pyrolusite
(d) Magnetite

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 86%
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In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

(1) copper (I) sulphide (Cu2S)

(2) sulphur dioxide (SO2)

(3) iron sulphide (FeS)

(4) carbon monoxide (CO)

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 75%
From NCERT
NEET - 2012
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Consider the following reactions at 1000°C.

(I) Zns+1/2O2gZnOg;
                                      G°=-360 kJ mol-1
(II) Cs +1/2O2gCog;
                                      G°=-460 kJ mol-1 

and choose the correct statement at 1000°C.

(a) ZnO is more stable than CO

(b) ZnO can be reduced to Zn by C

(c) ZnO and CO are formed at equal rate

(d) ZnO can not be reduced to Zn by C

Subtopic:  Ellingham Diagram | Metallurgy of individual elements |
 76%
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