An example of an amphoteric oxide.

The correct option is C

Al₂O₃

Amphoteric oxide:

• Amphoteric oxides are metallic oxides that can react with both acids and bases to form salt and water.
• It exhibits acidic as well as basic characteristics.

The explanation for the correct option:

Option (C)

• Aluminium oxide exhibits both acidic and basic behavior and has amphoteric nature.
• It can react with both acids and bases to form salt and water.

The explanation for the incorrect option:

Option (A)

• CuO is a basic oxide.
• It reacts with an acid to form salt and water but not with a base

Option (B)

• Fe₂O₃ is a basic oxide.
• It reacts with an acid to form salt and water but not with a base

Option (D)

• NO₂ is an acidic oxide.
• It reacts with a base to form salt and water but not with an acid

Hence, option(A) is the correct answer.