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  4. Copper sulphate dissolves in ammonical solution to give deep blue colour. The colour is due to the formation of:

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Q. Copper sulphate dissolves in ammonical solution to give deep blue colour. The colour is due to the formation of:

JIPMERJIPMER 1995

Solution:

Copper sulphate dissolves in ammonical solution as it forms complex compound with ammonia. $ CuS{{O}_{4}}+4N{{H}_{4}}OH\xrightarrow{{}} $ $ \underset{\text{deep}\,\text{blue}}{\mathop{[Cu{{(N{{H}_{3}})}_{4}}]\,S{{O}_{4}}}}\,+4{{H}_{2}}O $