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Question

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

A
Al2O3<SiO2<SO2<P2O3
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B
SO2<P2O3<SiO2<Al2O3
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C
SiO2<SO2<Al2O3<P2O3
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D
Al2O3<SiO2<P2O3<SO2
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Solution

The correct option is D Al2O3<SiO2<P2O3<SO2
Metallic oxides are basic in nature and non-metallic oxides are acidic in nature.
In general, as non-metallic character increases across the period, and hence the acidic character of their oxides increases. Therefore, correct order of acidic strength is: Al2O3<SiO2<P2O3<SO2

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