"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 |
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Roasting of sulphides gives the gas X as a by-product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a 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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching?

1. Argentite

2. Galena

3. Copper pyrite

4. Sphalerite

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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