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Which of the following is formed when ex...

Which of the following is formed when execess of `KCN` is added to an aqueous solution of copper sulphate ? .

A

`Cu(CN)_(2)`

B

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

C

`K[Cu(CN)_(2)]`

D

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

Text Solution

Verified by Experts

The correct Answer is:
d
`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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