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Hydrogen gas is passed over black copper...

Hydrogen gas is passed over black copper oxide. Give balanced reaction.

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When hydrogen gas is passed over black copper oxide, a reddish coloured layer of copper is formed.
`underset("Copper oxide")(CuO_((s)))+H_(2(g))+ underset("Copper")(Cu_((s)))+H_(2)O_((l))`
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