Question

(a) Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide.
(b) What special name is given to substances like aluminium oxide.
(c) Name another metal oxide which behaves like aluminium oxide.

Lakhmir Singh Chemistry Class 10

Answer 1

Answer:

(a) Al2O3 (acid) + 2NaOH =2NaAlO2 + H2O

Al2O3(base) + 6HCl = 2AlCl3 + 3H2O

(b) alumina, aloxide, alundum or aloxite.

(c) Zn

Answer 2

Explanation:

(a) When aluminium oxide reacts with hydrochloric acid, it behaves as a basic oxide. The reaction that takes places is -

Al2O3 + 6HCl → 2AlCl3 + 3H2O

When aluminium oxide reacts with a base such as sodium hydroxide, it behaves as an acidic oxide. The reaction that takes places is -

Al2O3 + 2NaOH →2NaAlO2 +  H2O

(b) When, aluminium oxide reacts with both the acids and bases it is called as an amphoteric oxide.

(c) The another metal oxide that behaves like aluminium oxide is zinc oxide.