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Nature of Oxides
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Which of the following is the most basic oxide :-The basic character of oxides increases with the metallic character of the element, which increases down a group.
$SeO_2$ is the oxide of a non-metal and is acidic.
$Al_2O_3$ is amphoteric.
$Sb_2O_3$ is amphoteric (antimony is a metalloid).
$Bi_2O_3$ is the oxide of bismuth, the most metallic element of group 15, and it is basic.
In group 15 the oxides of the type $E_2O_3$ change from acidic (N, P) through amphoteric (As, Sb) to basic (Bi).
So the most basic oxide is $Bi_2O_3$.