In Serpek's process , by product obtained in the purification of bauxite is:

1. Al2O3

2. N2

3. NH3

4. none

Subtopic:  Refining Process |
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CO is used in the metallurgy of:

1. Cu

2. Ni

3. Cr

4. Pt

Subtopic:  Refining Process |
 80%
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In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used for:

1. O2 and CO respectively

2. O2 and  Zn dust respectively

3. HNO3 and Zn dust respectiely

4. HNO3 and CO respectively

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 63%
From NCERT
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Name the metal M which is extracted on the basis of following reactions,

4M+8CN-+2H2O+O24[M(CN)2]-+4OH-

2[M(CN)2]-+Zn[Zn(CN)4]2-+2M

1. nickel

2. silver

3. copper

4. mercury

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 88%
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 |
 76%
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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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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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Alloy is an example of:

1. gel

2. aerosol

3. solid sol

4. emulsion

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 83%
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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%
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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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