Question

Which of the following is amphoteric?

• A. $B_2{O}_3$
• B. $Si{O}_2$
• C. $A{l}_2{O}_3$
• D. None of these

Answer 1

The correct option is C $A{l}_2{O}_3$

Oxides can be classified as acidic, basic, amphoteric or neutral. An amphoteric oxide is one that can act as either an acid or a base. Generally non-metallic oxides are acidic and metallic oxides are basic. Some non-metallic oxides are neutral and some metallic or semi metallic oxides are amphoteric.
$B_2{O}_3\text{and}Si{O}_2$ are acidic oxide. $A{l}_2{O}_3$ is an amphoteric oxide.