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Which of the following is the most basic oxide?

1. Sb2O3
2. Bi2O3
3. SeO2
4. Al2O3

Correct answer: Bi2O3

Solution

Bi2O3 is the most basic oxide among the given options because bismuth is the heaviest and least electronegative element in the group, leading to a more metallic and basic oxide. The other oxides are either amphoteric (Al2O3) or acidic (SeO2).

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