Q 1216801770.     Which of the following is formed when excess of `KCN` is added to aqueous solution of copper sulphate?

JEE 1996
A

`K_3[Cu(CN)_4]`

B

`K[Cu(CN)_2]`

C

`Cu(CN)_2`

D

`K_2[Cu(CN)_4]`

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