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

 NEET 2017

Zone refining

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Liquation

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Displacement with

Z n

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Distilation

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Solution

The correct option is C Displacement with $Z n$
$Z n$ being more reactive than $A g a n d A u$ , displaces them.

From Native ore,
$4 A g + 8 N a C N + 2 H_{2} O + O_{2} L e a c h i n g - ---- \to 4 N a [A g (C N)_{2}] + 4 N a O H soluble(Sodium dicyanoargentate(I))$

$2 N a [A g (C N)_{2}] + Z n D i s p l a c e m e n t - ------- \to N a_{2} [Z n (C N)_{4}] + 2 A g ↓$

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