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