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When excess of dilute NH4OH is added to an aqueous solution of copper sulphate an intense blue colour is obtained

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When excess of dilute NH4OH is added to an aqueous solution of copper sulphate an intense blue colour is obtained. This is due to the formation of : 

(A) CuSO4 

(B) Cu(OH)2 

(C) [Cu(NH3)4 ]2+ 

(D) (NH4)2SO4

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(C) [Cu(NH3)4 ]2+ 

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