What is the chemical formula for aluminium oxide?

Al₂O₃

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Al₃O₂

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AlO₂

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Al₂O

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Solution

The correct option is A
Al₂O₃

For Aluminium oxide, we write the symbol of cation $A l^{3 +}$ first followed by the symbol of anion $O_{2}^{-}$ Then their charges are criss crossed to get the formula.

Symbol: Al O

Valency: 3 2

Cross multiply both the valency

Therefore, ${A l}_{2} O_{3}$ is the chemical formula for aluminium oxide

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