"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 |
 84%
From NCERT
AIPMT - 2013
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The metal oxide which cannot be reduced to metal by carbon is:

1. Al2O3
2. PbO
3. ZnO
4. Fe2O3
Subtopic:  Ellingham Diagram |
 53%
From NCERT
NEET - 2013
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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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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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In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:

1. Copper(l) sulphide (Cu2S)

2. Sulphur dioxide (SO2)

3. Iron Sulphide (FeS)

4. Carbon monoxide (CO)

Subtopic:  Metallurgy of individual elements |
 81%
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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A pair of metals that can be purified by van Arkel method is:

1. Zr and Ti

2. Ag and Au

3. Ni and Fe

4. Ga and In

Subtopic:  Metallurgy of individual elements | Refining Process |
 91%
From NCERT
AIPMT - 2011
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The following reactions take place in the blast furnace in the preparation of impure iron.
Identify the reaction pertaining to the formation of the slag.


1. 2C(s) + O2(g) → 2CO (g)
2. Fe2O3(s) + 3CO (g) → 2Fe(l) + 3CO2(g)
3. CaCO3(s) → CaO(s) + CO2(g)
4. CaO(s) + SiO2(s) → CaSiO3(s)

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 77%
From NCERT
AIPMT - 2011
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