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Which compound is formed when excess KCN...

Which compound is formed when excess `KCN` is added to aqueous solution of copper sulphate?

A

`CaSO_(4)NH_(4)Cl H_(2)O`

B

`CaCl_(2)(NH_(4))_(2)SO_(4)H_(2)O`

C

`CaSO_(4)(NH_(4))_(2)SO_(2)O`

D

`CaCl_(2)NH_(4)Cl2H_(2)O`

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