Write reactions to justify amphoteric nature of aluminium.

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

$2\text{Al}_{(\text{S})}+6\text{HCl}_{(\text{aq})}\rightarrow2\text{Al}^{3+}_{(\text{aq})}+3\text{H}_{2(\text{g})}$
$2\text{Al}_{\text{(s)}}+2\text{NaOH}_{(\text{aq})}+6\text{H}_2\text{O}_{\text{(l)}}\rightarrow 2\text{Na}^{+}\big[\text{Al(OH)_4}\big]^{-}_\text{(aq)}+3\text{H}_{2\text{(g)}}$

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