Question:

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

Updated On: Jul 14, 2022
  • $ C{{u}^{2+}}ions $
  • $ Cu{{(OH)}_{2}} $
  • $ {{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}} $
  • none of these
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The Correct Option is C

Solution and Explanation

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 $
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