Question

What happens when hydrogen gas is added to copper
oxide?
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Answer 1

Answer:

If hydrogen gas is passed over heated copper oxide (CuO), the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained. ... The hydrogen is gaining oxygen and is being oxidised.In other words, one reactant gets oxidised while the other gets reduced

Explanation:

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Answer 2

Explanation:

According to reactivity series of metals copper is placed below hydrogen. So, on adding hydrogen gas on Copper Oxide, no reaction will take place.