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Roasted gold ore +CN^(-)+H(2)O overset(O...

Roasted gold ore `+CN^(-)+H_(2)O overset(O_(2)) to [x]+OH, [x]+Zn to [y]+Au[x] and |y|` are

A

`x=[Au (CN)_(2)]^(-) " " y=[Zn(CN)_(4)]^(-2)`

B

`x=[Au(CN)_(4)]^(-3) " " y=[Zn(CN_(4))]^(-2)`

C

`x=[Au(CN)_(2)]^(-) " " y=[Zn(CN)_(6)]^(-4)`

D

`x=[Au(CN)_(4)]^(-3) " " y=[Zn(CN)_(6)]^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`Au_(2)S+4NaCN hArr underset((x))(2Na[Au(CN)_(2)])+Na_(2)S`
`2Na[Au(CN)_(2)]^(-)+Zn to Na_(2)[Zn(CN)_(4)]+2Au`
`X=[Au(CN)_(2)]^(-) and Y=[Zn(CN)_(4)]^(-2)`
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