Silver ore + $C N^{-} + H_{2} O O_{2} - \to$ $[P] + O H^{-}$
$↓ Z n$
$[Q] + A g$
In the process of extraction of silver, identify the complexes [P] and [Q].

P = [A g (C N)_{4}]^{-}, Q = [Z n (C N)_{4}]^{2 -}

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P = [A g (C N)_{4}]^{-}, Q = [Z n (C N)_{6}]^{4 -}

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P = [A g (C N)_{4}]^{3 -}, Q = [Z n (C N)_{4}]^{2 -}

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P = [A g (C N)_{2}]^{-}, Q = [Z n (C N)_{4}]^{2 -}

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Solution

The correct option is C $P = [A g (C N)_{2}]^{-}, Q = [Z n (C N)_{4}]^{2 -}$
$2 A g + 4 C N^{-} + H_{2} O + \frac{1}{2} O_{2} \to 2 [A g (C N)_{2}]^{-} + 2 O H^{-}$
$2 [A g (C N)_{2}]^{-} + Z n \to [Z n (C N)_{4}]^{2 -} + 2 A g$
So, the complexes are: $P = [A g (C N)_{2}]^{-}, Q = [Z n (C N)_{4}]^{2 -}$

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