A pair of metals among the following that can be purified by the van Arkel method are:

1. Zr,  and Ti

2. Ag, and Au

3. Ni,  and Fe

4. Ga, and In

Subtopic:  Metallurgy of individual elements | Refining Process |
 94%
From NCERT
NEET - 2011
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Sulphide ores of metals are usually concentrated by Froth Flotation process. Which one of the following sulphide ores offers and exception and is concentrated by chemical leaching?

(1) Galena
(2) Copper pyrite
(3) Sphalerite
(4) Argentite.
Subtopic:  Metallurgy of individual elements |
NEET - 2007
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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%
From NCERT
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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 |
 71%
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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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