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Among the following oxides, which is least acidic?

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${Al}_{2} O_{3}$

$B_{2} O_{3}$

${CO}_{2}$

${NO}_{2}$

answer is A.

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Detailed Solution

Applying Fajans' rule, the higher the oxidation state (or charge), the more is the covalent character and the more is acidic and vice versa. Moreover, the acidic character increases from B to F.
Acidic character order is

${NO}_{2} > {CO}_{2} > B_{2} O_{3} > {Al}_{2} O_{3} (\begin{array}{l} least acidic \\ or amphoteric \end{array})$

$\begin{array}{lllll} Period \Rightarrow 2nd 2nd 2nd 3rd \\ Group \Rightarrow 15 14 13 13 \end{array}$

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