Extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by

(1) liquation

(2) distillation

(3) zone refining

(4) displacement with Zn

 

 

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 81%
From NCERT
NEET - 2017
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Match items of Column I with the items of Column II and assign the correct code.
        Column l                                                                    Column II
A. Cyanide process                                                            1. Ultrapure Ge
B. Froth floatation process                                                 2. Dressing of ZnS
C. Electrolytic reduction                                                      3. Extraction of Al
D. Zone refining                                                                  4. Extraction of Au
                                                                                            5. Purification of Ni
Codes
      A  B  C  D
(a)  2  3  1  5
(b)  1  2  3  4
(c)  3  4  5  1
(d)  4  2  3  1

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Refining Process |
 79%
NEET - 2016
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Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of :

1. Al2O+ HF + NaAlF4

2. Al2O3 + CaF2 + NaAlF4

3. Al2O3 + Na3AlF6 + CaF2

4. Al2O3 + KF +Na3AlF6

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 82%
From NCERT
NEET - 2012
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During extraction, copper is obtained by the reduction of cupric oxide with:

1. Cu2S

2. SO2

3. FeS

4. CO

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 71%
From NCERT
NEET - 2012
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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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