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Which of the following is a redox reaction in which the oxidation number of one element increases and that of another element decreases?

Answer and explanation

Correct answer: \(\mathrm{2Mg + O_2 \rightarrow 2MgO}\)

In \(\mathrm{2Mg + O_2 \rightarrow 2MgO}\), the oxidation number of Mg changes from \(0\) to \(+2\), so Mg is oxidised. The oxidation number of O changes from \(0\) to \(-2\), so O is reduced. Therefore, this is a redox reaction. In contrast, option C is a precipitation reaction with no change in oxidation numbers.

Related tags

Redox ReactionsOxidation NumberMagnesium OxideChemical EquationsClass 10 Science

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