Compound $X$ and aluminium are used to join railway tracks.
$(a)$ Identify the compound $X$.
$(b)$ Name the reaction.
$(c)$ Write down its chemical reaction.

(N/A) The compound $X$ is Iron$(III)$ oxide, represented as $Fe_{2}O_{3}$.
$(b)$ This reaction is known as the Thermite reaction.
$(c)$ The chemical equation for the reaction is:
$Fe_{2}O_{3}(s) + 2Al(s) \rightarrow 2Fe(l) + Al_{2}O_{3}(s) + \text{Heat}$