1.

KCN is used for separating

Answer»

`CO^(+2)` and `Ni^(+2)`
`MN^(+2)` and `ZN^(+2)`
`Ba^(+2)` and `Ca^(+2)`
`Cu^(+2)` and `Cd^(+2)`

Solution :a) `Cd^(2+) overset(KCN+H_(2)S)to underset("YELLOW ppt")(CDS darr)""`b) `Cu^(2+) overset(KCN)to K_(3) underset("soluble complex")([Cu[CN]_(4)])`
c) `Co^(2+)+2CN^(-) to Co^(2+) underset("Reddul brown ppt")([CN]_(2)darr)""`d)` Ni^(+2)+2CN^(-) to underset("green ppt")(Ni(CN)_(2)darr)`


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