The soluble complex formed during the extraction of silver from glance cyanide process is:

{N a}_{2} [Z n {(C N)}_{4}]

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{N a}_{2} [Z n {(C N)}_{6}]

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{N a}_{4} [Z n {(C N)}_{6}]

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None of these

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Solution

The correct option is C ${N a}_{2} [Z n {(C N)}_{4}]$
Sodium argentocyanide complex is formed which on treating with zinc metal gives silver.
${A g}_{2} S + 4 N a C N \to 2 N a [A g {(C N)}_{2}] + {N a}_{2} S$
$2 N [A g {(C N)}_{2} + Z n \to {N a}_{2} [Z n {(C N)}_{4}] + 2 A g$

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