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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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 |
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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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Select correct statement :

(a) The decomposition of an oxide into oxygen and metal vapour entropy increases 

(b) Decomposition of an oxide is an endothermic change

(c) To make G° negative, temperature should be high enough so that T S°>H°

(d) All are correct statements

Subtopic:  Ellingham Diagram |
 85%
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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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FeCr2O4 (chromite) is converted to Cr by following steps :

ChromiteINaCrO4IICr2O3IIICr

Reagents in I, II and III step might be:

          I-Step              II-Step                   III-Step

(a)Na2Co3/air,          C                             C

(b)NaOH/air,               C,                         Al, 

(c)Na2Co3/air,          C,                          C, 

(d)conc.H2SO4,          NH4Cl,                   C, 

Subtopic:  Metallurgy of individual elements |
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What is the composition of the anode mud used in the electrolytic refining of silver?

1. Zn, Cu, Ag, Au

2. Zn, Ag, Au

3. Cu, Ag, Au

4. Au only

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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Incorrect statement for the Hall-Heroult process is:

1. Cryolite  Na3AlF6  lower the melting point of  Al2O3, and increase its electrical conductivity.
2. Al is obtained at the cathode, and CO2 at the anode.
3. Li2CO3 can be used in place of cryolite(Na3AIF6)
4. MgF2  can be used in place of fluorspar (CaF2)

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