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

  1. A

    Al2O3<SiO2<SO2<P2O2

  2. B

    SiO2<SO2<Al2O3<P2O3

  3. C

    SO2<P2O3<SiO2<Al2O3

  4. D

    Al2O3<SiO2<P2O3<SO2

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    Solution:

    Across the period electronegativity increases, acidic character increases

    Al2O3 < SiO2 < P2O3 < SO2

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