Silver ore dissolves in dilute solution of NaCN in the presence of air to form:

A g C N

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

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A g S C N

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

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Solution

The correct option is B $[A g (C N)_{2}]^{-}$
Reactions occurs in extraction of silver -
$A g_{2} S + 4 N a C N \to 2 N a [A g (C N)_{2}] + N a_{2} S$ (reversible reaction)
$4 N a_{2} S + 5 O_{2} + H_{2} O \to 2 N a_{2} S O_{4} + 4 N a O H + 2 S$

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N a C N

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

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Y

4 A g + 8 K C N + O_{2} + 2 H_{2} O \to 4 K [A g (C N)_{2}] + 4 K O H

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