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When copper(II) oxide is heated with hydrogen, copper is formed. Which process occurs to copper(II) oxide in this reaction?

Answer and explanation

Correct answer: Reduction

The reaction is CuO + H₂ → Cu + H₂O on heating. Oxygen is removed from copper(II) oxide and combines with hydrogen to form water. Removal of oxygen is the defining sign of reduction, so CuO is reduced to copper. Oxidation would involve gaining oxygen or losing electrons; precipitation and neutralisation do not describe this change.

Related tags

ScienceClass 10Chemical ReactionsReductionRedox ReactionCopper OxideChemical Reactions And EquationsChemical Substances – Nature And Behaviour

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