Write reactions to justify the amphoteric nature of aluminum.


A substance is called amphoteric if it displays characteristics of both acids and bases. Aluminum dissolves in both acids and bases, showing amphoteric behaviour.
(i) 2AI(s)+6HCI(aq)2AI3+(aq)+6CI-(aq)+3H2(g)(ii) 2AI(s)+2NaOH(aq)+6H2O(l)2Na+[AI(OH)4]-(aq)+3H2(g)