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In the process of extraction of gold, ...

In the process of extraction of gold,
Roasted gold `ore + CN^(Ө) + H_(2)O overset(O_(2)) rarr [X] + OH^(Ө)`
`[X] + Zn rarr [Y] + Au`.

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)]^(-) Y = Zn(CN)_(4)]^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
A
`2Au + 4CN^(-) + H_(2)O +(1)/(2)O_(2)to2[Au(CN)_(2)]^(-)+20H^(-)`
`2[Au(CN)_(2)]^(-) + Zn to[Zn(CN)_(4)]^(2-)+2Au`
Hence, (A) is the correct answer. . . . .
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