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 |
 84%
From NCERT
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Which substance is used as basic refractory material in furnace?

1. Al2O3

2. SiO2

3. CaO

4. Fe2O3

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Refining Process |
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Plumbo-solvency refers to:

1. oxidation of lead to lead oxide

2. oxidation of lead to red lead

3. dissolution of lead in water containing air

4. making lead wires by forcing heated metal through a die

Subtopic:  Properties of Glass, Pb & Sn compounds |
 56%
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Rutile is an ore of:

1. Ti

2. Zr

3. Mn

4. V

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 51%
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Which is not a mineral?

1. Mica

2. Peat

3. Quartz

4. Felspar

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 55%
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Which element is purified by Zone refining?

1. Ge

2. Ge and Si

3. Si

4. None

Subtopic:  Refining Process |
 90%
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 |
 83%
From NCERT
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The second most common element on the earth is:

1. silicon

2. hydrogen

3. nitrogen

4. oxygen

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 56%
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Coating of zinc on iron objects is commonly known as:

1. electroplating

2. surface coating

4. galvanising

4. sheardising

Subtopic:  d-Block Elements- Properties & Uses |
 82%
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Nickel is purified by thermal decomposition of its:

1. Hydride

2. Chloride

3. Azide

4. Carbonyl

Subtopic:  Refining Process |
 76%
From NCERT
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