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Question

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

  2. Al2O3< SiO2< SO2<P2O3

  3. SiO2< SO2< Al2O3< P2O3

  4. SO2<P2O3<SiO2<Al2O3


Solution

The correct option is A

Al2O3< SiO2<P2O3< SO2


As non-metallic character increase from Aluminium to Sulphur the acidic characters of oxides increases in the order Al,Si,P,S.

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