Which of the following oxides is the most acidic?

A $Na X_{2} O$
B $MgO$
C $Al X_{2} O X_{3}$
D $SO X_{3}$

Answer: D

Oxides of strongly electropositive metals are basic, those of less electropositive elements are amphoteric, and those of highly electronegative non-metals are acidic.

SO X_{3}

reacts with water to give

H X_{2} SO X_{4}

, a strong acid, while

Na X_{2} O

and

MgO

are basic and

Al X_{2} O X_{3}

is amphoteric.

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