Question

A metal X reacts with oxygen to give amphoteric oxide. The metal X used here can be .

• A. sodium
• B. aluminium
• C. carbon
• D. potassium

Answer 1

The correct option is B aluminium

Aluminium on reaction with oxygen forms aluminium oxide (${\text{Al}}_2{\text{O}}_3$). ${\text{Al}}_2{\text{O}}_3$ is an amphoteric oxide, i.e. it shows both acidic as well as basic behaviour.
Mainly metallic oxides are basic and non-metallic are acidic oxides.