1) The option (s) with only amphoteric oxides is (are) A) $NO,B_{2}O_{3},PbO,SnO_{2}$ B) $Cr_{2}O_{3},CrO,SnO,PbO$ C) $Cr_{2}O_{3},BeO,SnO,SnO_{2}$ D) $ZnO,Al_{2}O_{3},PbO,PbO_{2}$ Answer: Option C,DExplanation:(c) is incorrect because NO is the neutral oxide (d) is incorrect because CrO is a basic oxide
