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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

` [Au(CN)_(2)]^(-) , [Zn (CN)_(4)]^(2-)`

B

`[Au(CN)_(4)]^(3-) , [Zn(CN)_(4)]^(2-)`

C

`[Au(CN)_(2)]^(2-) , [Zn(CN)_(6)]^(4-)`

D

`[Au(CN)_(4)]^(-) . [Zn(CN)_(4)]^(2-)`

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The correct Answer is:
A
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