In the proces of extraction of gold, R...

In the proces of extraction of gold,
Roasted ore + `CN^(-) + H_(2)O overset(O_(2)) to [X] + OH^(-)`
`[X] + Zn to [Y] + Au`
[X] and [Y] respectively are:

A

`X = [Au(CN)_2]^ѳ, Y = [Zn(CN)_4]^(2-)`

B

`X = [Au(CN)_2]^(3-) , Y = [Zn(CN)_4]^(2-)`

C

`X=[Au(CN)_2]^(ѳ),Y = [Zn(CN)_6]^(4-)`

D

`X=[Au(CN)_4]^(ѳ),Y=[Zn(CN)_4]^(2-)`

Verified by Experts

The correct Answer is:

A

`Au + 4CN^(ѳ) + H_(2)O + 1//O_2 rarr 2[Au(CN)_2]^(ѳ) + 2O^(ѳ)H`
`2[Au(CN)_2]^(ѳ)+Zn rarr [Zn(CN)_4]^(2-) + 2Au`

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