Write the balanced chemical equations for the following:
Silver chloride is treated with aqueous sodium cyanide and the product thus formed is allowed to react with zinc with zinc in an alkaline medium.

A g C l + 2 N a C N \to N a C l + N a_{2} [A g {(C N)}_{2}] 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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A g C l + 2 N a C N \to N a C l + N a [A g {(C N)}_{2}] 2 N a [A g {(C N)}_{2}] + Z n \to {N a}_{2} [A g {(C N)}_{4}] + 2 Z n ↓

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A g C l + 2 N a C N \to N a C l + N a [A g {(C N)}_{2}] 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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None of these

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Solution

The correct option is C $A g C l + 2 N a C N \to N a C l + N a [A g {(C N)}_{2}] 2 N a [A g {(C N)}_{2}] + Z n \to {N a}_{2} [Z n {(C N)}_{4}] + 2 A g ↓$
$A g C l + 2 N a C N \to N a C l + N a [A g {(C N)}_{2}] 2 N a [A g {(C N)}_{2}] + Z n \to {N a}_{2} [Z n {(C N)}_{4}] + 2 A g$

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2 N a [A g (C N)_{2}] + Z n \to N a_{2} [Z n (C N)_{4}] + 2 A g ↓

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

2 [A g (C N)_{2}]^{-} + Z n \to [Z n (C N)_{4}]^{2 -} + 2 A g

2 K [A g {(C N)}_{2}] + Z n ⟶ K_{2} [Z n {(C N)}_{4}] + 2 A g

Following reaction is reversible

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

AgCl dissolved in excess $N H_{3}$ , $K C N$ and $N a_{2} S_{2} O_{3}$ solutions the complex produce ions.

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