1.

Whichcompound is formedwhen excess of KCN is added to an aqueoussolutionof copper sulphate ?

Answer»

`Cu(CN)_(2)`
`K_(2)[Cu(CN)_(4)]`
`K[Cu(CN)_(2)]`
`K_(3)[Cu(CN)_(4)]`

SOLUTION :`2CuSO_(4) + 10KCN rarr 2K_(3)[Cu(CN)_(4)] + 2K_(2)SO_(4)+ (CN)_(2)` first `Cu(CN)_(2)` is formed which DECOMPOSES to form `(CN)_(2)` and `Cu_(2)(CN)_(2). Cu_(2)(CN)_(2)` then combines with KCN to form `K_(3)[Cu(CN)_(4)]`


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