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Which of the following is formed when ex...

Which of the following is formed when excess 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
When excess of `KCN` is added to an aqueous solution of copper sulphate, `K_3[Cu(CN)_4]` is formed.
`CuSO_4+2KCNtoCN(CN)_2+K_2SO_4`
`2Cu(CN)_2toCu(CN)_2+(CN)_2`
`Cu_2(CN)_2+6KCNto2K_3[Cu{CN)_4]`
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