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In the process of extraction of gold, ...

In the process of extraction of gold,
Roasted gold ore `+CN^(-)+H_2Ooverset(o_2)rarr[X]+OH^(-)`
`[X]+Znrarr[Y]+Au`
Identify the complexes [X] and [Y]

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
`Au + 4CN^(Ө) +H_(2)O + 1//2O_(2) rarr 2[Au(CN)_(2)]^(Ө) + 2O^(Ө)H`
`2[Au(CN)_(2)]^(Ө) + Zn rarr [Zn(CN)_(4)]^(2-) + 2 Au`.
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