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

Extraction of gold (Au) involves the formation of complex ions 'X' and 'Y'
`"Goldore"underset(CN^(-),H_(2)O,O_(2))overset("Roasting")to HO^(-)+'X'overset("Zn")to'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)^(-) andZn(CN)_(6)^(4-)`

D

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

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