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Which of the following is/are examples of thermite reduction?
- A thermite reaction may start if a ship (having Al parts) is hit by a missile
- Al2O3 + 3Mg -> 3MgO + 2Al (on heating)
- Fe2O3 + 2Al -> 2Fe + Al2O3 (on heating)
- Cr2O3 + Al -> 2Cr + Al2O3 (on heating)
Correct answer: Fe2O3 + 2Al -> 2Fe + Al2O3 (on heating)
Solution
Thermite reaction: metal oxide + Al -> metal + Al2O3 (Al is the reductant). Fe2O3 + 2Al -> 2Fe + Al2O3 is the prototype. Al2O3 + 3Mg is magnesiothermy (Mg as reductant, not thermite).
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