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What is the coordination entity formed w...

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate?

A

`CuCN`

B

`K_3 [Cu(CN)_6]`

C

`K[Cu(CN)_4]`

D

`K_3[Cu(CN)_4]`

Text Solution

Verified by Experts

The correct Answer is:
D
When excess of KCN(aq) is mixed with `CuSO_4(aq)`, a complex named potassium tetracyanocuprate (II) is formed. Since, `CN^(-)` ions are strong ligands, the complex is quite stable.
`2Cu^(2+) + 2CN^(-) to C_2N_2 , 2 CN^(-) to 2Cu CN`
`CuCN + 3CN^(-) to [Cu(CN)_4]^(3-)`
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