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The option(s) with only amphoteric oxides is(are)

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The option(s) with only amphoteric oxides is(are)

(A) Cr2O3, BeO, SnO, SnO2

(B) Cr2O3, Cro, SnO, PbO 

(C) NO, B2O3, PbO, SnO2

(D) ZnO, Al2O3, PbO, PbO2

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(A) Cr2O3, BeO, SnO, SnO2

(D) ZnO, Al2O3, PbO, PbO2

Amphoteric oxides are

ZnO, Al2O3, PbO, PbO2, BeO, SnO, SnO2, Cr2O3

NO is a neutral oxide. 

CrO is a basic oxide. 

B2O3 is an acidic oxide

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