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Question
Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide.
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Solution
When aluminium oxide reacts with hydrochloric acid, it behaves as a basic oxide:
Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(l)
When aluminium oxide reacts with a base like sodium hydroxide, it behaves as an acidic oxide:
Al2O3(s) + 2NaOH(aq) → 2NaAlO2(aq) + H2O(l)
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