Write a balanced chemical equation for each of the following reactions and also classify them.

iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas.

The reaction is as follows:

Fe₂O₃ + CO → Fe + CO₂

There are four molecules of oxygen on reactant side and only two molecules on product side. So let us first make the number of oxygen molecules same on both sides.

Fe₂O₃ + 3CO → Fe + 3CO₂

Now there are six molecules of oxygen on reactant and product side. Also the number of carbon molecules is same on both the sides. But there two molecules of iron on reactant side and only one molecule on product side. So the overall balanced equation can be written as follows:

Fe₂O₃ + 3CO → 2Fe + 3CO₂

This is a reduction reaction in which iron (III) oxide is getting reduced to iron metal.