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Which statement correctly identifies oxidation and reduction in the reaction \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\)?

Answer and explanation

Correct answer: Hydrogen is oxidised and copper(II) oxide is reduced.

Hydrogen has oxidation number 0 in \(\mathrm{H_2}\), which becomes +1 in \(\mathrm{H_2O}\); therefore, hydrogen is oxidised. Copper has oxidation number +2 in \(\mathrm{CuO}\) and 0 in \(\mathrm{Cu}\); therefore, copper(II) oxide is reduced. Option B states the opposite changes.

Related tags

Redox ReactionOxidation NumberCopper OxideReductionChemical Equations

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