Which of the following oxides is amphoteric in character?
Correct answer: D. SnO₂
- A. CaO
- B. CO₂
- C. SiO₂
- D. SnO₂
Explanation
Amphoteric oxides react with both acids and bases. Among the options, SnO₂ (tin oxide) shows this dual behavior. The others are either acidic or basic only.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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