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# Among $Al_2O_3, SiO_2,P_2O_3$ and $SO_2$ the correct order of acid strength is

$\begin{array}{1 1}(A)\;SO_2 < P_2O_3 < SiO_2 < Al_2O_3 \\(B)\;Al_2O_3 < SiO_2 < P_2O_3 < SO_2 \\(C)\; Al_2O_3 < SiO_2 < SO_2 < P_2O_3 \\ (D)\;SiO_2 < SO_2 < Al_2O_3 < P_2O_3 \end{array}$

The correct order is $Al_2O_3 < SiO_2 < P_2O_3 < SO_2$
Hence b is the correct answer.