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In the process of extraction of gold. ...

In the process of extraction of gold.
Roasted gold ore `+CN^(-)+H_(2)O overset(O_(2))rarr [X]+OH^(-)`
`[X]+Znrarr [Y]+Au`
Identify the complexes `[X] ` and `[Y]`.

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)]^(-3),[Y] =[Zn (CN_(6))]^(-4)`

D

`[X]=[Au(CN)_(4)]^(-),[Y] =[Zn (CN_(4))]^(-2)`

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The correct Answer is:
a
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