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

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a
Al2O3<SiO2<SO2<P2O2
b
SiO2<SO2<Al2O3<P2O3
c
SO2<P2O3<SiO2<Al2O3
d
Al2O3<SiO2<P2O3<SO2

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detailed solution

Correct option is D

Across the period electronegativity increases, acidic character increases

Al2O3 < SiO2 < P2O3 < SO2

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