An element forms an oxide $A_{2} O_{3}$ which is acidic in nature. Identify $A$ as metal or non-metal.

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Solution

Metallic oxides:
Metal oxides are usually basic.
$MgO (s) + H_{2} O (l) \leftrightarrow Mg {(OH)}_{2} (aq)$
Non- metallic oxides:
Non-metallic oxides are acidic.
${CO}_{2} (g) + H_{2} O (l) \leftrightarrow H_{2} {CO}_{3} (aq)$
Nature of metal $A$ :
Since element $A$ forms an oxide $A_{2} O_{3}$ that is acidic in nature
We know that oxides of non-metals are acidic in nature
Hence element $A$ is a non metal

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