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Question

On addition dilute HCl acid to copper oxide powder , the solution form is blue green .
Predict the new compound formed which imparts blue green colour of solution ? Write it's equation

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Solution

When HCl reacts with copper oxide, a blue green solution of copper (II) chloride is formed. The reaction is as follows:

HCl + CuO --------> CuCl2 + H2O
(aq) (s) (aq) (l)

This is a double replacement reaction. The soluble Copper(II)Chloride is blue-green in color and is responsible for the color of the solution formed.

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