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

Soln:

1. Answer is Fe₂O₃
2. Involved reaction is a thermite reaction which is also called as aluminothermy
3. Fe2O3(s) + 2Al(s)→ Al2O3 (s) + 2Fe(s) + Heat Ferric oxide Aluminium Aluminium Iron