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When copper oxide is heated with hydrogen, the black substance becomes reddish brown. What does this prove?

Answer and explanation

Correct answer: Reduction of copper oxide

Black copper(II) oxide reacts with hydrogen on heating: CuO + H₂ → Cu + H₂O. The black CuO loses oxygen and forms reddish-brown copper metal. Removal of oxygen from a compound is defined as reduction, while hydrogen is oxidised to water. Thus the colour change and reaction demonstrate reduction of copper oxide, not decomposition or freezing of the other substances.

Related tags

ScienceClass10ReductionCopper OxideRedox ReactionChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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