Consider the following reactions at 1000°C.

(I) Zns+1/2O2gZnOg;
                                      G°=-360 kJ mol-1
(II) Cs +1/2O2gCog;
                                      G°=-460 kJ mol-1 

and choose the correct statement at 1000°C.

(a) ZnO is more stable than CO

(b) ZnO can be reduced to Zn by C

(c) ZnO and CO are formed at equal rate

(d) ZnO can not be reduced to Zn by C

Subtopic:  Ellingham Diagram | Metallurgy of individual elements |
 76%
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Chromium is obtained by reducing concentrated chromite ore with :

(a) red hot coke

(b) gaseous hydrogen 

(c) aluminium powder

(d) carbon monoxide  

Subtopic:  Metallurgy of individual elements |
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The substance that acts as a collector in the froth flotation method is:

1. Sodium xenate.           

2. Sodium pyrophosphate.

3. Sodium nitroprusside.

4. Sodium ethyl xanthate. 

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 76%
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In the purification of impure nickel by Mond's process, metal is purified by:

(1) Electrolytic reduction

(2) Vapour phase thermal decomposition

(3) Thermite reduction

(4) Carbon reduction

 

Subtopic:  Refining Process |
 87%
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The reduction of an oxide by aluminium is called:

(1) Bayer's process

(2) Goldschmidt's aluminothermite process

(3) Hall's process

(4) van Arkel process

Subtopic:  Metallurgy of individual elements |
 62%
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The chemical composition of "slag" formed during the smelting process in the extraction of copper is :

(1) Cu2+FeS                                   

(2) FeSiO3

(3) CuFeS                                         

(4) Cu2S+FeO

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 88%
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The basic principle of froth floatation is-

1.  Impurities and metal ore have different wetting properties. 
2. Impurities and metal ore have different solubility.
3. Impurities and metal ore have different diversity.
4. Impurities and metal ore have different compressing power. 

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 84%
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Out of the following which metal can be purified by Van Arkel method?

1.  Au

2.  Zr

3.  Ag

4.  Cu

Subtopic:  Refining Process |
 94%
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During electrolysis of fused NaCl in order to obtain Na, H2 is liberated at the cathode of Pt while with the cathode of Hg, it forms sodium amalgam. This is because

(I)  Pt is inert

(2)  Hg is a liquid

(3)  More voltage is required to produce H2 at Hg than at Pt

(4)  H ions are formed rapidly when Hg is used as a cathode

Subtopic:  Electrode & Electrode Potential |
 53%
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Which of the following is an incorrect match?

1. Kaolinite - Al2(OH)4Si2O5

2. Cuprite - Cu2O

3. Siderite - FeCO3

4. Calamine - ZnSO4

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 74%
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