1.

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

Answer» Correct Answer - 1
`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`


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