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Which one of the following oxides shows amphoteric behaviour?

1. SnO₂
2. SiO₂
3. CO₂
4. CaO

Correct answer: SnO₂

Solution

SnO2 (Sn4+) is amphoteric, reacting with both acids and bases. SiO2 and CO2 are acidic and CaO is basic, so the amphoteric oxide is SnO2, not SiO2.

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