$(a)$ Consider the following chemical equation:
$Fe_{2}O_{3} + 2Al \rightarrow Al_{2}O_{3} + 2Fe$
Name two categories in which you can place this reaction.
$(b)$ Define the term 'Oxidation' of a substance and name the substance oxidised and the oxidising agent in the above reaction.

(N/A) The two categories for this reaction are:
$(i)$ Displacement reaction (specifically,a thermite reaction).
$(ii)$ Redox reaction (reduction-oxidation reaction).
$(b)$ Oxidation is defined as the addition of oxygen to a substance or the removal of hydrogen from a substance.
In the given reaction:
- Aluminium $(Al)$ is oxidised because it gains oxygen to form $Al_{2}O_{3}$.
- Iron$(III)$ oxide $(Fe_{2}O_{3})$ is the oxidising agent because it provides oxygen to aluminium.