When ammonia is added to a cupric salt solution,the deep blue colour is observed; it is due to the formation of
- A$[Cu(OH)_4]^{2-}$
- B$[Cu(NH_3)_4]^{2+}$
- C$[Cu(H_2O)_2(NH_3)_2]^{2+}$
- D$[Cu(H_2O)_4]^{2+}$
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