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In the thermit reaction Fe2O3 + 2Al gives 2Fe + Al2O3, which species is oxidised?
AIron oxide
BIron
COxygen
DAluminium
Answer & Solution
Correct answer: D. Aluminium
1. Oxidation is gain of oxygen; reduction is loss of oxygen.
2. Aluminium starts as free metal and ends combined with oxygen in Al2O3, gaining oxygen.
3. So aluminium is oxidised, acting as the reducing agent.
4. Iron loses oxygen (Fe2O3 to Fe), so iron is reduced, not oxidised, making that option wrong.
5. Aluminium being more reactive displaces iron from its oxide.
6. Hence the oxidised species is aluminium.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.114_
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