Q1. [1]
Which of the following is an amphoteric oxide ?
- (A) Na₂O
- (B) K₂O
- (C) CO₂
- (D) Al₂O₃
Previously asked in CBSE board exam
2026 31/5/1 Q19
Generated by claude-sonnet-4-6 · 2026-06-15 06:45 · grounding rag
Model Answer
(D) Al₂O₃
Al₂O₃ (aluminium oxide) is an amphoteric oxide because it reacts with both acids and bases to form salt and water.
Explanation
- Na₂O and K₂O are basic oxides (formed from active metals); CO₂ is an acidic oxide (non-metallic).
- Amphoteric oxides show dual behaviour — they react with acids as well as bases. Al₂O₃ is the classic CBSE example of an amphoteric oxide.
- Remember: Zn, Al, Pb, Sn form amphoteric oxides — useful for MCQs.
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