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In the thermite reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance is oxidised and which is reduced?

Answer and explanation

Correct answer: Aluminium is oxidised and \(Fe^{3+}\) present in \(Fe_2O_3\) is reduced

The oxidation state of aluminium increases from \(0\) to \(+3\), so it loses electrons and is oxidised. Iron in \(Fe_2O_3\) has oxidation state \(+3\), which becomes \(0\) in elemental \(Fe\); thus \(Fe^{3+}\) gains electrons and is reduced. Option B reverses both changes.

Related tags

Thermite ReactionRedox ReactionOxidationReductionOxidation NumberChemical Reactions

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