Q. 84.2( 26 Votes )

Write reactions to justify amphoteric nature of aluminium.

Answer :

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

(i) 2Al(s) + 6HCl(aq) 2Al3 + (aq) + 6Cl(aq) + 3H2(g)


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


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