Which of the following is the most basic oxide /

Options

A. `Sb_(2)O_(3)`
B. `Bi_(2)O_(4)`
C. `SeO_(2)`
D. `Al_(2)O_(3)`

Answer

B

Explanation

More the oxidation state of the central atom (metal) more is its acidity. Hence `SeO_(2) (O.S. "of " 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 `Al_(2)O_(3) and Sb_(2)O_(3)` are amphoteric and `Bi_(2)O_(3)` is basic.