Which of the following oxide is amphoteric in nature?

N a_{2} O

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L i_{2} O

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K_{2} O

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A l_{2} O_{3}

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Solution

The correct option is D $A l_{2} O_{3}$
Some metal oxides, such as aluminium oxide, zinc oxide, etc., show both acidic as well as basic behaviour. Such metal oxides which react with both acids as well as bases to produce salts and water are known as amphoteric oxides.
$A l_{2} O_{3}$ is amphoteric in nature.

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Classify ${Na}_{2} O$ , ${Al}_{2} O_{3}$ and ${SO}_{3}$ as acidic, basic or amphoteric oxide. [3 MARKS]

C a O

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S O_{3}

N a_{2} O

Z n O

A l_{2} O_{3}

F e_{2} O_{3}

A l_{2} O_{3}

M g O

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C u O, N a_{2} O, M g O, A l_{2} O_{3}

B_{2} O_{3}, A l_{2} O_{3}

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