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

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Among Al2O3 , SiO2 , P2O3 and SO2 the correct order of acid strength is
(a) SO2 < P2O3 < SiO2 < Al2O3
(b) SiO2 < SO2 < Al2O3 < P2O3
(c) Al2O3 < SiO2 < SO2 < P2O3
(d) Al2O3 < SiO2 < P2O3 < SO2.

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(d) : Acidity of the oxides of non metals increases with the electronegativity and oxidation number of the element.
Al2O3 < SiO2 < P2O3 < SO2
Al2O3 is amphoteric. SiO2 is slightly acidic whereas P2O3 and SO2 are the anhydrides of the acids H3PO3 and H2SO3.

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