1.

CuSO_(4)(aq) overset(H_(2)S(uarr))(to)M(darr)overset("Excess")underset(KCn)(to)N+O Then final products N and O are respectively.

Answer»

`[Cu(CN)_(4)]^(3-), (CN)_(2)`
`CuCN, (CN)_(2)`
`[Cu(CN)_(4)]^(2-), (CN)_(2)`
`Cu(CN)_(2), K_(2)S`

Solution :`CuSO_(4)(AQ) OVERSET(H_(2)S)underset("Black ppt. (M)")to overset(KCN)underset("EXCESS")(to)+underset(N)([Cu(CN)_(4)]^(3-))+(CN)_(2)(uarr)`


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