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Question:

Write reactions to justify amphoteric nature of aluminium.

Answer:

A substance is called amphoteric if it displays characteristics of both acids and bases. Aluminium dissolves in both acids and bases, showing its amphoteric behaviour.

(i) 2AI(s) + 6HCI(aq)  →   2AI3+(aq)   +   6Cl-(aq)  +  3H2(g)

(ii) 2AI(s) + 2NaOH(aq) + 6H2O(l)   →  2Na+[Al(OH)4]-(aq)  + 3H2(g)


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