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Question

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

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

The correct option is D Al2O3<SiO2<P2O3<SO2
The oxides given are 3rd period oxides,so as we go from left to right in a period acidic strength of oxides will be increases as size decreases.

Al2O3 is amphoterric,SiO2 is slightly acidic whereas P2O3 and SO2 are anhydrides of acid H3PO3 and H2SO3.

So the correct order of acidic strength oxides of 3rd period elements is A12O3<SiO2<P2O3<SO2

Hence option D is correct.

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