Arrange the following oxides in the increasing order of Bronsted basicity. `CI_(2)O_(7),BaO,SO_(3),CO_(2),B_(2)O_(3)`

Explanation

`BaO+H_(2)O hArr Ba(OH)_(2) "(Basic)" " " CO_(2)+H_(2)O hArr H_(2)CO_(3)` (Weakly acidic)
`SO_(3)+H_(2)O hArr H_(2)SO_(4) "(Strongly acidic)" " " B_(2)O_(3)+3H_(2)O hArr 2 H_(2)BO_(3)` (Very weakly acidic)
`Al_(2)O_(7)+H_(2)O hArr 2 HClO_(4)` (Very strongly acidic)
Hence, in the decreasing order of basicity, we have `BaO gt B_(2)O_(3) gt CO_(2) gt SO_(3) gt Cl_(2)O_(7)`.