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Extraction of gold and silver involves l...

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

A

displacement of metal by some other metal from the complex ion.

B

roasting of metal complex.

C

calcination followed by roasting.

D

thermal decomposition of metal complex.

Text Solution

Verified by Experts

The correct Answer is:
A
`2[Au(CN)_2]^(-) + Zn to 2Au + [Zn(CN)_4]^(2-)`
or `2[Ag(CN)_2]^(-) + Zn to 2Ag + Zn(CN)_4 ]^(2-)`
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Extraction of gold and silver involves leaching with CN^(-) ion.silver is later recovered by: