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

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Distillation

Zone refining

Displacement with Zinc

Liquation

answer is C.

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Detailed Solution

Zinc being more reactive than Ag and Au, displaces them ,

$\begin{array}{l} 4 A g + 8 N a C N + 2 H_{2} O + O_{2} \overset{L e a c h i n g}{\to} 4 N a [A g {(C N)}_{2}] + 4 N a O H \\ 2 N a [A g {(C N)}_{2}] + Z n \overset{D i s p l a c e m e n t}{\to} N a_{2} [Z n {(C N)}_{4}] + 2 A g ↓ \end{array}$

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