Which one of the following metallic acid exhibit amphoteric nature?

C a O

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N a_{2} O

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B a O

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A l_{2} O_{3}

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Solution

The correct option is D $A l_{2} O_{3}$
Aluminum oxide, $A l_{2} O_{3}$ exhibits amphoteric nature. It reacts with acids as well as alkalies.

$A l_{2} O_{3} + 6 H C l \to 2 A l C l_{3} + 3 H_{2} O$

$A l_{2} O_{3} + 2 N a O H \to 2 N a A l O_{2} + H_{2} O$

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