Which of the following reactants are used to carry out the thermite reaction for welding the broken railway tracks?(a) Al₂O₃ + Fe (b) MnO₂ + Al (c) Fe₂O₃ + Al (d) Cu₂O + Fe

Correct answer: (c) Fe2O3 + Al

Explanation: During the thermite reaction, Iron oxide is reduced to iron by aluminium. This molten iron is then poured in between the broken pieces of iron on railway tracks and is fixed mutually.