Roasting is generally carried out in case of :

(1) oxide ores

(2) sulphide ores

(3) silicate ores

(4) carbonate ores

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 87%
From NCERT
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Alloy is an example of:

(1) gel

(2) aerosol

(3) solid sol

(4) emulsion

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 89%
From NCERT
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Nickel is purified by thermal decomposition of its:

(1) Hydride

(2) Chloride

(3) Azide

(4) Carbonyl

Subtopic:  Refining Process |
 77%
From NCERT
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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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