1.

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

Answer»

`X=[Au(CN)_(2)]^(-) , Y=[Zn(CN)_(4)]^(2-)`
`X=[Au(CN)_(4)]^(3-) , Y=[Zn(CN)_(4)]^(2-)`
`X=[Au(CN)_(2)] , Y=[Zn(CN)_(6)]^(2-)`
`X=[Au(CN)_(4)]^(3-) , Y=[Zn(CN)_(6)]^(4-)`

Solution :`2[Au(CN)_(2)]^(-) (AQ)+Zn(s) to [Zn(CN)_(4)]^(2-)(aq)+2Au(s)`


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