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Extractionofgold(Au)involves theformationofcomplex ions 'X' and 'Y' Gold oreoverset ("Roasting") underset (CN^(-),H _2O,O_2 ) toHO ^(-) + Xoverset(Zn) toY+ Au 'X' and'Y' arerespectively

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` Au(CN)_(2)^(-) and Zn(CN)_4^(2-) `
`Au(CN)_4^(3-) and Zn (CN)_4^(2-) `
`Au (CN)_3^(-) and Zn (CN)_6^(4-) `
`Au (CN)_4^(-) and Zn (CN)_3^(-) `

Solution : `4 Au +8 CN^(-)+2H_ 2 O+O_2to4 OH^(-)+4 [UNDERSET((X))(Au (CN)_2 )]^(-) `
`2 [Au(CN)_2]^(-) + Zn to2 Au+ [ underset((Y))(Zn(CN)_4)]^(2-) `


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