Write reactions to justify amphoteric nature of aluminium.
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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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The amphoteric nature of the element explains that it can react with both acids and bases. Aluminium dissolves in mineral adds and aqueous alkalies and thus shows amphoteric character. Aluminium dissolves in dilute HQ and liberates dihydrogen.
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