Identify incorrect match -

1. Kaolinite - Al2OH4Si2O5

2. Cuprite - Cu2O

3. Siderite - FeCO3

4. Calamine - ZnSO4

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 78%
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Which among the following is not an oxide ore?

1. Malachite

2. Cuprite

3. Zincite

4. Bauxite

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 68%
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Mg in the Kroll process acts as

(1)  Reducing agent

(2)  Oxidizing agent

(3)  Oxidizing agent at low temperature

(4)  Reducing agent at low temperature

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 58%
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The process of converting hydrated alumina into anhydrous alumina is called

1. Roasting

2. Smelting

3. Dressing

4. Calcination

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 55%
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Identify the metal M, which has the following extraction principle.

MS + O2  MO +SO2 MO + MS  2M + 2SO2

1.  Mg

2.  Pb

3.  Sn

4.  Fe

Subtopic:  Metallurgy of individual elements |
 74%
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Compound (D) is

1.  NaAlO2

2.  AlOH3

3.  Al2O3

4.  Na2O

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 82%
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Consider the following metallurgical process

Sulphide  oxide  impure metal  pure metal

The various processes A, B, and C respectively

1.  Calcination, smelting, and electrolysis

2.  Roasting, smelting, and electrolysis

3.  Calcination, auto reduction, and bassemetisation

4.  Roasting, aluminothermic reduction, electrolysis

Subtopic:  Metallurgy of individual elements |
 75%
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NaCN is a depressant that is used: 

1. To Separate PbS from ZnS by forming a complex with PbS.
2. To Separate PbS from ZnS by forming a complex with ZnS.
3. To Form froth.
4. As a collector.

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 71%
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Ellingham's diagram for the formation of CO2 is a straight line in the given graph. This is due to:

1. Increase in entropy during CO2 formation.

2. Decrease in entropy during CO2 formation.

3. Entropy remains constant during CO2 formation.

4. Can not be predicted.

Subtopic:  Ellingham Diagram |
 80%
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Which of the following statements is correct regarding the slag obtained during the

extraction of a metal like copper or iron?

(1)  The slag is lighter and has a lower melting point than the metal

(2)  The slag is heavier and has a lower melting point than the metal

(3)  The slag is lighter and has a higher melting point than the metal

(4)  The slag is heavier and has a higher melting point than the metal

Subtopic:  Metallurgy of individual elements |
 56%
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