In the process of extraction of gold, the following reaction takes place:
Roasted gold ore $+ C N^{-} + H_{2} O \to [X] + O H^{-}$
$[X] + Z n \to [Y] + A u$
Identify the compounds [X] and [Y].

[X] = [A u (C N)_{2}]^{-},

[Y] = [Z n (C N)_{4}]^{2 -}

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[X] = [A u (C N)_{4}]^{3 -},

[Y] = [Z n (C N)_{4}]^{2 -}

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[X] = [A u (C N)_{2}]^{-},

[Y] = [Z n (C N)_{6}]^{4 -}

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[X] = [A u (C N)_{4}]^{-},

[Y] = [Z n (C N)_{6}]^{2 -}

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Solution

The correct option is A $[X] = [A u (C N)_{2}]^{-},$ $[Y] = [Z n (C N)_{4}]^{2 -}$
Roasted Gold Ore + $C N^{-} + H_{2} O \to [A u (C N)_{2}]^{-} + O H^{-}$

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

Hence, $[X] = [A u (C N)_{2}]^{-}$ and $[Y] = [Z n (C N)_{4}]^{2 -}$ .
Option A is correct.

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