1.

In the process of extraction of gold Roasted gold ore +CN^(-)+H_(2)Ooverset(O_(2))to[X]+OH^(-)[X]+Znto[Y]+Identify the complexes [X] and [Y]

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

SOLUTION :`2Au + 4CN^(-) + H_(2)O +(1)/(2)O_(2)to2[Au(CN)_(2)]^(-)+20H^(-)`
`2[Au(CN)_(2)]^(-) + Zn to[Zn(CN)_(4)]^(2-)+2Au`
Hence, (A) is the correct answer. . . . .


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