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In the reaction CuO + H₂ → Cu + H₂O, which is the correct identification of oxidation and reduction?

Answer and explanation

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

Oxidation can be identified by an increase in oxidation number or addition of oxygen, while reduction involves a decrease in oxidation number or removal of oxygen. In H₂, hydrogen has oxidation number 0; in H₂O it becomes +1, so hydrogen is oxidised. Copper in CuO is +2 and becomes elemental copper with oxidation number 0, so CuO is reduced. Since both occur together, this is a redox reaction and option A is correct.

Related tags

ScienceClass 10Redox ReactionOxidationReductionChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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