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A student says that magnesium is not oxidised in the reaction 2Mg + O₂ → 2MgO because it merely combines with oxygen to form a compound. What is the error in this statement?

Answer and explanation

Correct answer: Magnesium gains oxygen, so it is oxidised.

The error is treating compound formation as unrelated to oxidation. Oxidation includes addition of oxygen, so magnesium is oxidised when it changes from elemental Mg to MgO. Its oxidation number rises from 0 to +2. Oxygen changes from 0 to −2 and is reduced. Option C incorrectly assigns magnesium’s oxidation to oxygen, while B and D contradict the redox definitions. Hence option A is correct.

Related tags

Redox ReactionsOxidation NumberMagnesium OxideOxidationChemical EquationsChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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