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Nature of Oxides

A light metal...

Question

A light metal M is a good conductor of electricity. It forms a layer when exposed to air, which is an amphoteric oxide of the formula $M_{2} O_{3}$ . Identify M.

A

Ca

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B

Al

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C

Mg

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D

Ba

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Solution

The correct option is B Al
Here, only $A l$ forms amphoteric oxide of formula $A l_{2} O_{3}$ .
It forms protective layer of $A l_{2} O_{3}$ when exposed to air.

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