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Which substance is reduced in the reaction between copper(II) oxide and hydrogen?

Answer and explanation

Correct answer: Copper(II) oxide

The reaction is \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\). Oxygen is removed from copper(II) oxide to form copper. Removal of oxygen is reduction, so copper(II) oxide is reduced. In contrast, hydrogen gains oxygen to form water and is oxidised. Copper is the product of reduction, not the reactant that undergoes reduction.

Related tags

Class 10 ScienceChemical ReactionsRedox ReactionsReductionCopper OxideHydrogen

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