Question

Which of the following oxides is amphoteric in nature?

• A. Na₂O
• B. CO₂
• C. Al₂O₃
• D. SO₂

Hint:

Al₂O₃ is a classic example of an amphoteric oxide — it reacts with both acids and bases.

Answer 1

The Correct Option is C

To determine which oxide is amphoteric in nature, we must understand the definition and behavior of amphoteric oxides. Amphoteric oxides are chemical compounds that can react with both acids and bases to form salts and water.

Analysis of Options:

• Na₂O (Sodium oxide): This is a basic oxide because it reacts with acids to form salts and water, but not with bases.
• CO₂ (Carbon dioxide): This is an acidic oxide as it reacts with bases to form carbonates or bicarbonates and does not react with acids.
• Al₂O₃ (Aluminum oxide): This is an amphoteric oxide because it can react with acids (e.g., HCl) to form compounds like aluminum chloride and with bases (e.g., NaOH) to form compounds like sodium aluminate.
• SO₂ (Sulfur dioxide): This is an acidic oxide, as it reacts with bases to form sulfites and does not react with acids.

Based on these characteristics, the amphoteric oxide among the options given is Al₂O₃.