The option (s) with only amphoteric oxid...

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

A

`Cr_2O_3 , BeO , SnO , SnO_2`

B

`ZnO, Al_2O_3 , PbO, PbO_2`

C

`NO , B_2O_3 , PbO , SnO_2`

D

`Cr_2O_3 , CrO , SnO , PbO`

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The correct Answer is:

A, B

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