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Extraction of gold (Au) involves the for...

Extraction of gold (Au) involves the formation of complex ions 'X' and 'Y'
`"Gold ore "overset("Roasting")underset(CN^(-),H_(2)O,O_(2))rarr HO^(-)+'X' overset(Zn)rarr'Y'+Au`
'X' and 'Y' are respectively-

A

`Au(CN)_(2)^(-) and Zn(CN)_(4)^(2-)`

B

`Au(CN)_(4)^(3-) and Zn(CN)_(4)^(2-)`

C

`Au(CN)_(3)^(-) and (CN)_(6)^(4-)`

D

`Au(CN)_(4)^(-) and Zn(CN)_(3)^(-)`

Text Solution

Verified by Experts

The correct Answer is:
A
`4Au+8CN^(-)+2H_(2)O+O_(2)rarr4OH^(-)+4[Au underset("(X)")((CN)_(2))]^(-)`
`2[Au(CN)_(2)]^(-)+Znrarr2Au+underset("(Y)")([Zn(CN)_(4)]^(2-)`
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