Justify that the following reaction is a redox reaction:
Fe2O3() + 3CO(g) → 2Fe() + 3CO2(g)
In above reaction, oxidation number of Fe decreases from +3 to zero, which shows that Fe2O3 is reduced to Fe and the oxidation number of C increases from +2 to +4, which shows that CO is oxidised to CO2. Hence, it is a redox reaction.