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(B) When excess $NH_3$ is added to a solution containing $Cu^{2+}$ ions (such as $CuSO_4$),a deep blue coloured complex is formed.The reaction is: $Cu

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for coloured solution.

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(B) When excess $NH_3$ is added to a solution containing $Cu^{2+}$ ions (such as $CuSO_4$),a deep blue coloured complex is formed.The reaction is: $Cu^{2+}(aq) + 4NH_3(aq) \longrightarrow [Cu(NH_3)_4]^{2+}(aq)$.This complex,tetraamminecopper$(II)$ ion,is responsible for the characteristic deep blue colour of the solution.Therefore,the correct classification for this reaction is for a coloured solution.

Assign $A, B, C, D$ from the given type of reaction.
$CuSO_4 + NH_3$ (Excess) $\longrightarrow [Cu(NH_3)_4]^{2+}$

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Assign $A, B, C, D$ from the given type of reaction.$CuSO_4 + NH_3$ (Excess) $\longrightarrow [Cu(NH_3)_4]^{2+}$