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Extraction of gold and silver involves l...

Extraction of gold and silver involves leaching with `CN^(-)`ion.silver is later recovered by:

A

liquation

B

distillation

C

zone refining

D

displacement with `Zn`

Text Solution

Verified by Experts

The correct Answer is:
D

Extraction of gold and silver involves leaching with `CN^(-)` ion. Silver is later recovered by distillation of Zn.
In the metallurgy of silver or gold, the respective metal is leached with a dilute solution of NaCN or KCN in the presence of air to obtain the metal in solution as complex. From the complex, metal is obtained later by replacement.
In general.
`4M(s) + 8CN^(-)(aq)+2H_(2)O(aq)+O_(2)(g)rarr4[M(CN)_(2)]^(-)(aq)+4OH^(-)(aq)`
`2[M(CN)_(2)]^(-)(aq)+Zn(s) rarr[Zn(CN)_(4)]^(2-)(aq)+2M(s)`
M = Ag or Au
This method is known as Mac-Arthur Forest cyanide process.
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Knowledge Check

  • Extraction of gold and silver involes Teaching with CN^- ion. Silver is later recovered by:-

    A
    distillation
    B
    zone refining
    C
    displacement with Zn
    D
    liquation
  • Extraction of gold and silver involves leaching the metal with CN^(-) ion. Sliver is later recovered by :

    A
    distillation
    B
    zone refining
    C
    displacement
    D
    liquation.
  • Extraction of gold and silver involves leaching the metal with CN^(-) ion. The metal is recovered by

    A
    roasting of metal complex
    B
    calcination followed by roasting
    C
    thermal decomposition of metal complex
    D
    displacement of metal by some other metal from the complex ion
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