Which of the following oxides is acidic in nature?

1. B2O3

2. Al2O3

3. Ga2O3

4. In2O3

 
 


Hint: Down the group basic character increases.

The acidic nature of oxides changes from acidic to basic through amphoteric on moving down the group.
B2O3Moreacidic
lessbasic,Al2O3andGa2O3Amphoteric,In2O3andTl2O3Basic