The correct order of acid strength is

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(B) The acidic strength of oxides increases as the non-metallic character of the central atom increases across a period from left to right.As the elec

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$Al_2O_3 < SiO_2 < P_2O_5 < SO_3$

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(B) The acidic strength of oxides increases as the non-metallic character of the central atom increases across a period from left to right.As the electronegativity $(EN)$ of the central atom increases,the acidic strength of its oxide increases.The order of electronegativity for the given elements is $Al Therefore,the correct order of acidic strength is $Al_2O_3 < SiO_2 < P_2O_5 < SO_3$.

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