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


( A ) Al2O3<SiO2<P2O3<SO2
( B ) Al2O3<SiO2<SO2<P2O3
( C ) SO2<P2O3<SiO2<Al2O3
( D ) SiO2<SO2<Al2O3<P2O3
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