$A g_{2} S + N a C N ⟶ (A), (A) + Z n ⟶ (B)$
(B) is a metal. Hence (A) and (B) are:

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

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

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N a_{2} [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 C $N a_{2} [A g (C N)_{2}], A g$
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, the correct answer is option B.

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

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A g_{2} S + N a C N + Z n ⟶ A g

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