Among Al₂O₃, SiO₂, P₂O₃ and SO₂ the correct order of acid strength is

SO₂ < P₂O₃ < SiO₂ < Al₂O₃

Al₂O₃ < SiO₂ < P₂O₃ < SO₂

Al₂O₃ < SiO₂ < SO₂ < P₂O₃

Al₂O₃ < SiO₂ < SO₂ < P₂O₃

Al₂O₃ < SiO₂ < P₂O₃ < SO₂

While moving along a group from top to bottom acidic nature of oxides decreases and along a period left to right, acidic nature increases.
Al, Si, P, S

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Chemical Bonding and Molecular Structure

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Chemistry Part I

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Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is SO2 < P2O3 < SiO2 < Al2O3 Al2O3 < SiO2 < P2O3 < SO2 Al2O3 < SiO2 < SO2 < P2O3 Al2O3 < SiO2 < SO2 < P2O3

Chemical Bonding and Molecular Structure

Chemistry Part I

Among Al₂O₃, SiO₂, P₂O₃ and SO₂ the correct order of acid strength is

SO₂ < P₂O₃ < SiO₂ < Al₂O₃

Al₂O₃ < SiO₂ < P₂O₃ < SO₂

Al₂O₃ < SiO₂ < SO₂ < P₂O₃

Al₂O₃ < SiO₂ < SO₂ < P₂O₃