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Which of the following sequences correctly arranges Al₂O₃, SiO₂, P₂O₃ and SO₂ in increasing acid strength?

1. Al₂O₃ < SiO₂ < SO₂ < P₂O₃
2. SiO₂ < SO₂ < Al₂O₃ < P₂O₃
3. SO₂ < P₂O₃ < SiO₂ < Al₂O₃
4. Al₂O₃ < SiO₂ < P₂O₃ < SO₂

Correct answer: Al₂O₃ < SiO₂ < SO₂ < P₂O₃

Solution

Al₂O₃ is amphoteric and hence least acidic among the given oxides. SiO₂ is weakly acidic, SO₂ is more acidic, and P₂O₃ is still more acidic, so the increasing order is Al₂O₃ < SiO₂ < SO₂ < P₂O₃.

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