1.

Extraction of gold(Au) involves the formation of complex ions'X' and 'Y'.Gold ore underset(CN^(-) , H_(2)O, O_(2))to HO^(-) + 'X' overset(Zn) to 'Y' + Au X and Y are respectively________.

Answer»

`[AU(CN)_(2)]^(-) and [Zn(CN)_(4)]^(2-)`
`[Au(CN)_(4)]^(3-) and [Zn(CN)_(4)]^(2-)`
`[Au(CN)_(3)]^(-) and [Zn(CN)_(6)]^(4-)`
`[Au(CN)_(4)]^(-) and [Zn(CN)_(3)]^(-)`

ANSWER :A


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