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Which option lists only amphoteric oxides?

1. Cr2O3, CrO, SnO, PbO
2. NO, B2O3, PbO, SnO2
3. Cr2O3, BeO, SnO, SnO2
4. ZnO, Al2O3, PbO, PbO2

Correct answer: Cr2O3, BeO, SnO, SnO2

Solution

Cr2O3, BeO, SnO and SnO2 are all amphoteric; the other sets include CrO (basic), NO (neutral), B2O3 (acidic) or PbO2 (which is not classed as simply amphoteric in this set), so they are rejected.

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