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A student claims that in the reaction 2Mg + O₂ → 2MgO, magnesium is reduced because it combines with oxygen. What is the correct evaluation of this claim?

Answer and explanation

Correct answer: The claim is incorrect; magnesium is oxidised by gaining oxygen.

The governing concept is oxidation–reduction. Gaining oxygen is oxidation, not reduction. In elemental magnesium, Mg has oxidation number 0; in MgO it becomes +2, so magnesium loses electrons and is oxidised. Oxygen changes from 0 to −2 and is reduced. Therefore option B correctly evaluates the claim. Option A reverses the definitions, C gives the wrong oxidation-number change, and D wrongly calls oxygen oxidation.

Related tags

Chemical ReactionsRedox ReactionsOxidationReductionOxidation NumberMagnesiumChemical Reactions And EquationsChemical Substances – Nature And Behaviour

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