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Copper sulphate dissolves in excess of K...

Copper sulphate dissolves in excess of KCN to give

A

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

B

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

C

`Cu(CN)_(2)`

D

`Cu[Kcu(CN)_(4)]`

Text Solution

Verified by Experts

The correct Answer is:
B
`CuSO_(4)` reacts with KCN to give a white precipitate of cuprous cyanide and cyanogen gas. The cuprous cyanide dissolves in excess of KCN forming `K_(3)[Cu(CN)_(4)]`
`CuSO_(4) + 2KCN to K_(2)SO_(4) + Cu(CN)_(2)`
`2Cu(CN)_(2) to 2CuCN + CN - CN`
`CuCN + 3KCN to K_(3)[Cu(CN)_(4)]`
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