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When hydrogen gas is passed over heated copper(II) oxide, the black copper(II) oxide changes into reddish-brown copper. Which statement correctly describes this reaction?

Answer and explanation

Correct answer: Copper(II) oxide is reduced, and the reaction is a redox reaction.

The reaction is \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\). Oxygen is removed from copper(II) oxide, so \(\mathrm{CuO}\) is reduced to copper. At the same time, hydrogen gains oxygen to form water and is therefore oxidised. Since reduction and oxidation occur together, this is a redox reaction. Option D is not correct because precipitation usually refers to the formation of an insoluble solid when two aqueous solutions are mixed.

Related tags

ScienceClass10Chemical ReactionsCopper OxideReductionOxidationRedox

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