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When black copper(II) oxide is heated with hydrogen gas, it changes into reddish-brown copper. This change is primarily evidence of which process?

Answer and explanation

Correct answer: Reduction of copper(II) oxide

The reaction is \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\). Black copper(II) oxide loses oxygen and changes into reddish-brown copper. Loss of oxygen is reduction, so copper(II) oxide is reduced. In contrast, oxidation of copper would involve copper gaining oxygen to form an oxide.

Related tags

ScienceClass10Chemical ReactionsRedox ReactionsCopper OxideReduction

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