Question

Which of the following metals form amphoteric oxide?

• A. Sodium
• B. Silver
• C. Aluminium
• D. Iron

Answer 1

The correct option is C

Aluminium

Aluminium forms amphoteric oxides since it reacts with both acids and alkalis.

For example:

${Al}_2{O}_3$ + $6HCl$ $\to$ $2Al{Cl}_3$ + $3H_{2}O$

${Al}_2{O}_3$ + $2NaOH$ $\to$ $2NaAl{O}_2$ + $H_{2}O$