When ammonia (aq) is added to a cupric salt solution, the deep blue colour is observed due to formation of

1
\([Cu(OH)_4]^{2-}\)
2
\([Cu(NH_3)_4]^{2+}_{aq}\)
3
\([Cu(H_2O)_2(NH_3)_2]^{2+}\)
4
\([Cu(H_2O)_4]^{2+}\)

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