$A g_{2} S + N a C N \to A$

$A + Z n \to B$

B is a metal. Hence A and B :

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

Z n

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

A g

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N a [A g (C N)_{4})]

A g

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N a_{3} [A g (C N)_{4})]

A g

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Solution

The correct option is B $N a [A g (C N)_{2})]$ , $A g$
Reaction:
$A g_{2} S + 4 N a C N \to 2 N a [A g (C N)_{2}] + N a_{2} S$

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

Hence, from reaction, A is $N a [A g (C N)_{2}]$ and B is metal $A g$ .

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