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Question

black metallic oxide which reacts with hydrochloric acid to give a coloured solution?

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Solution

The solution is as follows:

1. Black metallic oxide is copper oxide ( CuO).

2. The reaction is as follows:

CuO(s) + 2 HCl (aq) CuCl2(aq) + H2(g)

3. CuClā€‹2 is green in colour.

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