Question

Distinguish between MnO2 and CuO.

Answer 1

Use concentrated HCl with MnO2 greenish yellow chlorine gas will be formed.
With CuO CuCl2 & water will be formed,the black residue changes to blue solution

Answer 2

The differences between the manganese dioxide and copper oxide are listed below:

1) When adding the concentrated hydrochloric acid to the black powder and the heat :

• The manganese dioxide produces chlorine with greenish yellow gas.  

• The copper oxide does not form any chlorine

2) Filtration:

• The filtrate from $\mathrm{MnO}_{2}$ is brownish in color.

• In CuO, the filtrate is bluish in colour.

3) When adding the Ammonium hydroxide to the above respective filtrate

• No precipitation has been formed

• Here, the pale blue precipitation has been formed.

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