Extraction of gold and silver involves leaching was $C N^{-}$ ion. Silver is later recovered by:

displacement with

Z n

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liquation

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distillation

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zone refining

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Solution

The correct option is A displacement with $Z n$
Extraction of gold and silver involves leaching was $C N^{-}$ ion. Silver is later recovered by displacement with $Z n$ .
$A g_{2} S + 4 N a C N ⇌ 2 N a [A g (C N)_{2}] + N a_{2} S$
$2 N a [A g (C N)_{2}] + Z n \to N a_{2} [Z n (C N)_{4}] + 2 A g ↓$

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