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Question

Which one of the following is most acidic?

A
Al2O3
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B
Na2O
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C
MgO
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D
CaO
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Solution

The correct option is A Al2O3
Na2O,MgO,CaO are metallic oxide of s block. These metallic oxides are powerful bases, while Al2O3 is metallic oxide of p block which has comparatively more acidic character. Hence, it is the most acidic oxide among all.

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