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Which correctly identifies the oxidation and reduction changes in the reaction CuO + H₂ → Cu + H₂O?

Answer and explanation

Correct answer: Reduction of copper oxide and oxidation of hydrogen

In CuO, copper has oxidation number +2 and becomes elemental copper with oxidation number 0, so CuO is reduced. Hydrogen in H₂ has oxidation number 0 and becomes +1 in H₂O, so hydrogen is oxidised. Thus option A correctly identifies both changes. A decrease in oxidation number means reduction, while an increase means oxidation.

Related tags

ScienceClass 10Redox ReactionOxidation NumberReductionChemical EquationsChemical Reactions And EquationsChemical Substances – Nature And Behaviour

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