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Roasted gold ore `+CN^(-)+H_(2)O overset(O_(2)) to [X]+OH^(-)`

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Roasted gold ore `+CN^(-)+H_(2)O overset(O_(2)) to [X]+OH^(-)`
A. `X=[Au(CN)_(2)]^(-) , Y=[Zn(CN)_(4)]^(2-)`
B. `X=[Au(CN)_(4)]^(3-) , Y=[Zn(CN)_(4)]^(2-)`
C. `X=[Au(CN)_(2)] , Y=[Zn(CN)_(6)]^(2-)`
D. `X=[Au(CN)_(4)]^(3-) , Y=[Zn(CN)_(6)]^(4-)`
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Correct Answer - A
`2[Au(CN)_(2)]^(-) (aq)+Zn(s) to [Zn(CN)_(4)]^(2-)(aq)+2Au(s)`
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