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On heating copper powder in air, the sur...

On heating copper powder in air, the surface of copper powder becomes coated with black CuO. How can this black coating be converted into brown copper ? Write chemical equation for the reaction that occurs during the colour change.

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Hydrogen gas is passed through the black copper oxide and as a result, it gets reduced to copper which is brown in colour.
`underset("(Black)")(CuO) + H_(2) to underset("(Brown)")(Cu) + H_(2)O`
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