Ncert Exercises & Solutions

Which of the following oxides is acidic in nature?

1. $B_{2} O_{3}$

2. ${Al}_{2} O_{3}$

3. ${Ga}_{2} O_{3}$

4. ${In}_{2} O_{3}$

Hint: Down the group basic character increases.

The acidic nature of oxides changes from acidic to basic through amphoteric on moving down the group.

\underset{More acidic}{B_{2} O_{3}}

less basic, \underset{Amphoteric}{{Al}_{2} O_{3} and {Ga}_{2} O_{3}}, \underset{Basic}{{In}_{2} O_{3} and {Tl}_{2} O_{3}}