$A l_{2} O_{3}$ reacts with ___________.

Only water

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Only acids

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Only alkalis

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Both acids and alkalis

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Solution

The correct option is D Both acids and alkalis
$A l_{2} O_{3}$ is an amphoteric oxide and thus can react with both acid and base (alkali).
${A l}_{2} O_{3} + 6 H C l \to 2 A l {C l}_{3} + 3 H_{2} {A l}_{2} O_{3} + 2 N a O H \to 2 N a A l O_{2} + H_{2} O$

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