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On adding dilute hydrochloric acid to co...

On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green.
(a). Predict the new compound formed which imparts a blue-green colour to solution.
(b). Write a balanced chemcial equation of the reaction which takes place.
(c). On the basis of the above reaction, what can you say about the nature of copper oxide?

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