The correct order of acidic strength is:

1
SO2 < P2O3 < SiO2 < Al2O3
2
SiO2 < SO2 < Al2O< P2O
3
 Al2O< SiO2 < SO2 < P2O3
4
 Al2O< SiO2  < P2O3 < SO2 

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