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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.

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

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