Consider the following reactions at 1000 oC.

(I) ZnS + 1/2O2(g)  \(\xrightarrow[]{\Delta }\)  ZnO(g);  ∆Go = -360 kJ mol-1
(II) Cs + 1/2O2(g)  \(\xrightarrow[]{\Delta }\) CO(g); ∆Go = -460 kJ mol-1  

Choose the correct statement about the above reactions at 1000 oC:

1. ZnO is more stable than CO

2. ZnO can be reduced to Zn by C

3. ZnO, and CO are formed at an equal rate

4. ZnO can not be reduced to Zn by C

Subtopic:  Ellingham Diagram | Metallurgy of individual elements |
 72%
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Chromium is obtained by reducing concentrated chromite ore with :

1. Red hot coke

2. Gaseous hydrogen 

3. Aluminium powder

4. Carbon monoxide  

Subtopic:  Metallurgy of individual elements |
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Which is not correctly matched:

(1) spieglesian                                    : Mn+Fe+C

(2) Dow's sea water process                 :MgOH2

(3) parke's process                               :Ag

(4) liquation                                         spelter(Impure Zn

Subtopic:  Metallurgy of individual elements |
 54%
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Incorrect match is :

(a) Purification of Al :Baeyer's method 

(b) polling :Reduction of Cu2O

(C)FeCr2O4 (chromite ore) : NaOH/Na2CO3

(d) Ag: Mac Arthur cyanideprocess 

Subtopic:  Metallurgy of individual elements |
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Aluminium metal is purified by:

(1) Hoope's process           

(2) Hall's process

(3) Serpeck's process         

(4) Baeyer's process

Subtopic:  Refining Process |
 51%
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Poling process is used for:

(1) The removal of Cu2O from Cu     

(2) The removal of Al2O3 from Al

(3) The removal of Fe2O3 from Fe     

(4) All of these

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 61%
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AgCl on fusion with sodium carbonate, gives:

1. Ag2CO3                       

2. Ag2O

3. Ag                               

4. Ag2C2

Subtopic:  Metallurgy of individual elements |
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XCl2(excess) + YCl2  XCl4+Y; 

YO >400°12O2+ Y, 

Ore of Y would be:

(a) Siderite               

(b) Cinnabar

(c) Malachite             

(d) Hornsilver

Subtopic:  Metallurgy of individual elements |
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Leaching of Ag2S is carried out by heating it with a dilute solution of:

1. NaCN only                     

2. HCl

3. NaOH                           

4. NaCN in presence of O2

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 70%
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Leaching is commercially carried out for in the concentration of:

(1) Galena                           

(2) Argentite

(3) Copper pyrites               

(4) tin stone

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 67%
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