The correct option in which both the oxides are amphoteric a)ZnO,Cr2O3 b) Mn2O7, CrO3 c)CrO,V2O5 d)V2O5, Mn2O7

To determine which option contains both amphoteric oxides, we need to understand what amphoteric oxides are. Amphoteric oxides are compounds that can act as both acids and bases, meaning they can react with both acids and bases.

Let's analyze each option:

a) ZnO, Cr2O3: ZnO is amphoteric, as it can react with both acids and bases. However, Cr2O3 is not amphoteric, as it only reacts with bases. Therefore, option a) is not correct.

b) Mn2O7, CrO3: Mn2O7 is not amphoteric, as it only reacts with bases. CrO3 is also not amphoteric, as it only reacts with bases. Therefore, option b) is not correct.

c) CrO, V2O5: CrO is amphoteric, as it can react with both acids and bases. V2O5 is also amphoteric, as it can react with both acids and bases. Therefore, option c) is correct.

d) V2O5, Mn2O7: V2O5 is amphoteric, as it can react with both acids and bases. Mn2O7 is not amphoteric, as it only reacts with bases. Therefore, option d) is not correct.

Based on our analysis, the correct option in which both oxides are amphoteric is c) CrO, V2O5.