Which one of the following is an amphoteric oxide?
$B_{2} O_{3}, A l_{2} O_{3}$

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Solution

$A l_{2} O_{3}$ is amphoteric in nature. It reacts with both acid and base.
$A l_{2} O_{3} + H C l \to A l C l_{3} + H_{2} O$
$A l_{2} O_{3} + N a O H \to N a A l O_{2} + H_{2} O$

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