The number of amphoteric oxides among Cr...

The number of amphoteric oxides among `Cr_2O_3, V_2O_5,CrO, Mn_2O_7, NiO, Fe_2O_3, Mn_3O_4, VO_2, Cu_2O, MnO_2, CrO_2 ` is

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The correct Answer is:

6

`Cr_2O_3, V_2 O_5, Mn_3O_4, VO_2, MnO_2 , CrO_2`.

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