In Mac-Arthur Forrest method, silver is extracted from solution of $N a [A g (C N)_{2}]$ by the use of

F e

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M g

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C u

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Z n

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Solution

The correct option is D $Z n$
Cyanide process is used for extraction of Ag which is also called Mc-Arthur forest process.Reactions occurs in extraction of silver -
$A g_{2} S + 4 N a C N \to 2 N a [A g (C N)_{2}] + N a_{2} S$ (reversible reaction)
$4 N a_{2} S + 5 O_{2} + H_{2} O \to 2 N a_{2} S O_{4} + 4 N a O H + 2 S$
and $2 N a [A g (C N)_{2}] + Z n \to N a_{2} [Z n (C N)_{4}] + 2 A g$

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N a [A g (C N)_{2}]

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