Question

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 chemical 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?

Answer 1

Answer:

(a)the new compound will be copper chloride and water is realesd in this reaction. And this reaction is known as displacement reaction

(b) cuo(g)+2Hcl(aq)= cucl2(s)+H2o(l)

(c)the nature of copper oxide is acidic

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Answer 2

(a) Cuprous chloride imparts a blue-green colour to solution.

(b) CuO (Cuprous Oxide) + $2 \mathrm{HCl}$ (Hydrochloric acid) → $CuCl_2$ (Cuprous chloride) + $H_2 O$ (water)

(c) From the above equation, it is clear that the nature of copper oxide is basic.

Explanation:

• The chemical formula of cuprous oxide is $C u O$. It is a black or brown colored powder, which is insoluble in water.
• But it is soluble in potassium cyanide and ammonium chloride; insoluble in ammonium hydroxide, alcohol and ammonium carbonate.