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Which of the following is the most basic oxide?
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The correct answer is:
$\mathrm{Bi}_{2} \mathrm{O}_{3}$
More the oxidation state of the central atom (metal) more is its acidity. Hence $\mathrm{SeO}_{2}(\mathrm{O} . \mathrm{S} .$ of $\mathrm{Se}=+4)$ is acidic. Further for a given O.S., the basic character of the oxides increases with the increasing size of the central atom. Thus $\mathrm{Al}_{2} \mathrm{O}_{3}$ and $\mathrm{Sb}_{2} \mathrm{O}_{3}$ are amphoteric and $\mathrm{Bi}_{2} \mathrm{O}_{3}$ is basic.
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