The options with only amphoteric oxides are
NO,B2O3,PbO,SnO2
Cr2O3,CrO,SnO,PbO
Cr2O3,BeO,SnO,SnO2
ZnO,Al2O3,PbO,PbO2
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What are amphoteric oxides? Give two examples of amphoteric oxides.