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From the list Mn2O7, CrO3, Cr2O3, CrO, MnO2, V2O4, which oxides are amphoteric?

1. MnO2 and Cr2O3
2. Mn2O7 and CrO3
3. CrO and MnO2
4. CrO3 and V2O4

Correct answer: MnO2 and Cr2O3

Solution

In transition metal chemistry: Mn2O7 (+7 Mn) is strongly acidic. CrO3 (+6 Cr) is acidic. CrO (+2 Cr) is basic. Cr2O3 (+3 Cr) is amphoteric - it dissolves in both acid and base. MnO2 (+4 Mn) is amphoteric. V2O4 (+4 V) is also amphoteric. Among the given options, MnO2 and Cr2O3 together represent amphoteric oxides.

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