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 |
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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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The process of bringing the metal or its ore into solution by the action of a suitable

chemical reagent followed by extraction of the metal either by electrolysis or by a

the suitable precipitating agent is called

1.  Electrometallurgy

2.  Hydrometallurgy

3.  Electrorefining

4.  Zone refining

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 51%
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Why is roasting important in the iron metallurgy process?  

1. FeO gets oxidized to Fe2O3 which does not combine with acidic SiO2
2. SiO2 is an acidic oxide which can combine with metallic oxides i.e. FeO, and Fe2O3
3. FeO when roasted get oxidized to more basic Fe2O3
4. None of the above.

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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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 |
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Compound (D) is

1.  NaAlO2

2.  AlOH3

3.  Al2O3

4.  Na2O

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