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When copper oxide is added to dilute hydrochloric acid, a blue-green solution forms. What does this prove?

Answer and explanation

Correct answer: Copper oxide behaves as a basic oxide and forms salt with acid

Copper oxide is a metal oxide, and its reaction with hydrochloric acid demonstrates the basic nature of many metal oxides. The reaction is CuO + 2HCl → CuCl₂ + H₂O. Copper(II) chloride dissolves in the solution and gives it a blue-green colour, while water is also formed. Thus the observation supports option A: copper oxide reacts with an acid to produce a salt and water. The other options contradict the reaction or the observed chemistry.

Related tags

Copper OxideHydrochloric AcidBasic OxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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