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Extraction of gold and silber involves l...

Extraction of gold and silber 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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displacement of metal by some other metal from the complex ion.
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