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Question

The blue-green colour of the solution is due to the formation of copper(II) chloride in the reaction' this is an example of which kind of chemical reaction?


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Solution

The blue-green colour solution of copper(II) chloride:

  • Copper(II) chlorideCuCl2 gets formed when copper oxide CuO undergoes a reaction with hydrochloric acidHCl.
  • The balanced chemical reaction for this is given as follows:

CuO(s)Copperoxide+2HCl(aq)HydrochloricacidCuCl2(aq)Copper(II)chloride+H2O(l)Water

  • Copper(II) chlorideCuCl2 is light brown colour solid but, after adsorption of moisture formed during the reaction its colour changes into blue-green.

Hence, the blue-green colour of the solution which is due to the formation of copper(II) chloride in the reaction' is an example of the reaction of metallic oxide with acid.


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