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Reaction of Metallic Oxides and Hydroxides with Acids

Name it when ...

Question

Name it when Black Metallic Oxide reacts with HCL acid to give a coloured solution.

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Solution

The black metallic oxide is copper oxide, which reacts with HCl to form a coloured solution of copper chloride.
CuO + 2 HCl â†’ CuCl₂ + H2

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