Among the oxides $SiO_2, SO_2, Al_2O_3$ and $P_2O_3$,the correct order of acidic strength is

  • A
    $SiO_2 < SO_2 < Al_2O_3 < P_2O_3$
  • B
    $SO_2 < P_2O_3 < Al_2O_3 < SiO_2$
  • C
    $Al_2O_3 < SiO_2 < P_2O_3 < SO_2$
  • D
    $Al_2O_3 < P_2O_3 < SiO_2 < SO_2$

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