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]`.

Options

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)_(5)]^(4-)`
D. `X=[Au(CN)_(4)]^(-),Y=[Zn(CN)_(4)]^(2-)`

Answer

1

Explanation

`Au+2CN^(-)+H_(2)O+.^(1)//_(2)O_(2)rarr[Au(CN)_(2)]^(-)(X)+2OH^(-),2[Au(CN)_(2)]^(-)+Zn=[Zn(CN)_(4)]^(2-)(Y)+2Au`