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Leaching

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Question

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

A

Liquation

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B

Distillation

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C

Zone refining

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D

Displacement with

Z n

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Solution

The correct option is D Displacement with $Z n$
$Z n$ being more reactive than $A g$ and $A u$ , displace them.
From the native ore,

$4 Ag + 8 NaCN + 2 H_{2} O + O_{2} L e a c h i n g - ---- \to 4 N a [A g (C N)_{2}] Soluble Sodium dicyanoargentate(I) + 4 N a O H 2 N a [A g (C N)_{2}] + Z n D i s p l a c e m e n t - ------- \to N a_{2} [Z n (C N)_{4}] + 2 A g ↓$

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