Question

What will happen, if hydrogen gas is passed over this black colored substance called copper oxide

Answer 1

Answer:

When hydrogen gas is passed over heated copper (II) oxide, copper and steam are. When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Write the balanced chemical equation for this reaction and state (i) the substance oxidized and (ii) the substance reduced in the reaction.

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Answer 2

Answer:

When hydrogen gas is passed over hot copper oxide, the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained.