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Copper sulphate solution forms blue colo...

Copper sulphate solution forms blue coloured complex with excess of ammonia. Its formula is

A

`[Cu(NH_3)_4]^(+3)`

B

`[Cu(NH_3)_4]^(+2)`

C

`[Cu(NH_4)_3]^(+2)`

D

`[Cu(NH_4)_3]^(+3)`

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