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In the reaction CuO + H₂ → Cu + H₂O, water is formed. What does this show about hydrogen?

Answer and explanation

Correct answer: Hydrogen is oxidised

Hydrogen combines with oxygen removed from copper(II) oxide and forms water. By the classical definition, gain of oxygen is oxidation, so hydrogen is oxidised and option B is correct. Copper(II) oxide loses oxygen and becomes copper; therefore CuO is reduced. Hydrogen is the reducing agent because it causes CuO to lose oxygen, not the oxidising agent. No precipitate is involved in this reaction.

Related tags

Chemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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