1.

In the process of extraction of gold roasted gold ore+ CN^(-) + H_2O overset(O_2)(rarr) [X] + OH^(-) [X] + Zn to [Y] + Au 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)_(4)]^(4-)`
`X :- [Au (CN)_(4)]^(-) Y : [Zn(CN)_(4)]^(-)`

Solution :`Au + 2CN^(-) + H_2O overset(O_2)(RARR) [Au(CN)_2]^(-) + OH[X]`
`2[ZU (CN)_(2)]^(-) + Zn to [Zn(CN)_(4)]^(2-) + 2Au[Y]`


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