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Q.

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

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a

[Au(CN)4]2− and [Zn(CN)6]4−

b

[Au(CN)4]3− and [Zn(CN)4]2−

c

[Au(CN)4]2− and [Zn(CN)4]2−

d

[Au(CN)2]− and [Zn(CN)4]2−

answer is D.

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Detailed Solution

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 placeAu+CN−+H2O→X, X+Zn→Y+AuHere, X and Y respectively are