During the extraction of gold the following reactions takes placeAu+CN−+H2O→X, X+Zn→Y+AuHere, X and Y respectively are

4Au(s)+8CN−(aq)+2H2O(aq)→O24[Au(CN)2]−(X)+4OH−(aq)2[Au(CN)2]−(q)+Zn(s)→[Zn(CN)4]2−(aq)+2Au(s)(Y)

During the extraction of gold the following reactions takes placeAu+CN−+H2O→X, X+Zn→Y+AuHere, X and Y respectively are

4Au(s)+8CN−(aq)+2H2O(aq)→O24[Au(CN)2]−(X)+4OH−(aq)2[Au(CN)2]−(q)+Zn(s)→[Zn(CN)4]2−(aq)+2Au(s)(Y)

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During the extraction of gold the following reactions takes place
$Au + {CN}^{-} + H_{2} O \to X, X + Zn \to Y + Au$
Here, X and Y respectively are

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${[Au {(CN)}_{4}]}^{3 -} and {[Zn {(CN)}_{4}]}^{2 -}$

${[Au {(CN)}_{4}]}^{2 -} and {[Zn {(CN)}_{4}]}^{2 -}$

${[Au {(CN)}_{4}]}^{2 -} and {[Zn {(CN)}_{6}]}^{4 -}$

${[Au {(CN)}_{2}]}^{-} and {[Zn {(CN)}_{4}]}^{2 -}$

answer is D.

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Detailed Solution

$\begin{array}{l} 4 Au (s) + 8 {CN}^{-} (aq) + 2 H_{2} O (aq) \overset{O_{2}}{\to} 4 \underset{(X)}{{[Au {(CN)}_{2}]}^{-}} + 4 {OH}^{-} (aq) \\ 2 {[Au {(CN)}_{2}]}^{-} (q) + Zn (s) \to {[Zn {(CN)}_{4}]}^{2 -} (aq) + \underset{(Y)}{2 Au (s)} \end{array}$