Extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by:

1. Distillation

2. Zone refining

3. Displacement with Zn

4. Liquation

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 77%
From NCERT
NEET - 2017
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Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

1. Fe

2. Zn

3. Mg

4. Cu

Subtopic:  Ellingham Diagram |
 73%
From NCERT
NEET - 2018
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Match items of Column I with the items of Column II and assign the correct code. 

Column I Column II
A) Cyanide process  1) Ultra pure Ge
B) Froth floatation
    Process
2) Dressing of ZnS
C) Electrolytic  3) Extraction of Al
    Reduction
D) Zone refining 4) Extracting of Au
 
A B C D
1. 2 3 1 4
2. 1 2 3 4
3. 3 4 2 1
4. 4 2 3 1
Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Refining Process |
 81%
From NCERT
NEET - 2016
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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. Iron(II) sulphide

2. Carbon monoxide

3. Copper(I) sulphide

4. Sulphur dioxide

Subtopic:  Metallurgy of individual elements |
 65%
From NCERT
NEET - 2015
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"Metals are usually not found as nitrates in their ores". Out of the following two (I and II) reasons which is/are true for the above observation? 

I: Metal nitrates are highly unstable.
II: Metal nitrates are highly soluble in water.
1. I and II are true
2. I and II are false
3. I is false but II is true
4. I is true but II is false

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
NEET - 2015
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Roasting of sulphides gives the gas X as a by-product. This is a colourless gas with a choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic and  acts as an oxidizing agent and its acid has never been isolated. The gas X is:

1. SO2

2. CO2

3. SO3

4. H2S

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 83%
From NCERT
AIPMT - 2013
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Which one of the following is a mineral of iron?

1. Malachite

2. Cassiterite

3. Pyrolusite

4. Magnetite

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 85%
From NCERT
AIPMT - 2012
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An interstitial compound among the following is:

1. Invar

2. Steel

3. Bell metal

4. Bronze

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
AIPMT - 2012
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Which of the following elements is present as an impurity to the maximum extent in the pig Iron?
1. Carbon
2. Silicon
3. Phosphorus
4. Manganese

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 81%
From NCERT
AIPMT - 2011
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Which one is a malachite from the following?

1. CuCO3.Cu(OH)2

2. CuFeS2

3. Cu(OH)2

4. Fe3O4

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 80%
From NCERT
NEET - 2019
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