Silver is obtained from $N a [A g (C N)_{2}]$ by reaction with:

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Solution

The correct option is C Zn
Silver and gold are extracted by the cyanide process (Mac Arthur - Forrest process). After the preliminary crushing and concentration by froth floatation process, the ore (crushed auriferous rocks in the case of gold) is leached with dilute (0.4 - 7%) solution of sodium cyanide made alkaline by adding lime kept agitated by a current of air. Silver (or gold) pass into solution as argentocyanide (or aurocyanide):

$A g_{2} S + 4 N a C N \to 2 N a [A g (C N)_{2}] + N a_{2} S$

Silver is obtained by reaction with Zn:
$2 N a [A g (C N)_{2}] + Z n \to N a_{2} [Z n (C N)_{4}] + 2 A g$

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

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