Extraction of Ag from sulphide ore and removal of unreacted silver from photographic plate involve complexes:

[A g (S_{2} O_{3})_{2}]^{3 -}

in both

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

in both

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[A g (C N)_{2}]^{3 -}, [A g (C N)_{2}]^{-}

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[A g (C N)_{2}]^{-}, [A g (S_{2} O_{3})_{2}]^{3 -}

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Solution

The correct option is D $[A g (C N)_{2}]^{-}, [A g (S_{2} O_{3})_{2}]^{3 -}$
The reactions involved are:
(i) Ore:
$4 A g (s) + 8 C N^{-} (a q) + 2 H_{2} O (a q) + O_{2} (g) \to 4 [A g (C N)_{2}]^{-} (a q) + 4 O H^{-} (a q)$
$2 [A g (C N)_{2}]^{-} (a q) + Z n (s) \to [Z n (C N)_{4}]^{2 -} (a q) + 2 A g (s)$
(ii) Photographic plate:
$A g X (s) + 2 N a_{2} S_{2} O_{3} (a q) \to N a_{3} [A g (S_{2} O_{3})_{2}] (a q) + N a X (a q)$

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K C N, N H_{3}

N a_{2} S_{2} O_{3}

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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[A g (N H_{3})_{2}]^{+}, A g (C N)_{2}]^{-}, [A g (S_{2} O_{3})_{2}]^{3 -}

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