Question

How does the nature of the oxides of manganese vary with an increase in the oxidation state?

Answer 1

1. Oxides of manganese in lower oxidation states (e.g., +2) are basic in nature.
2. Oxides in intermediate oxidation states (e.g., +3, +4) are generally amphoteric.
3. Oxides in higher oxidation states (e.g., +7) are acidic.
4. This shows an increase in acidity of manganese oxides as the oxidation state increases from +2 to +7.

Example sequence: MnO (basic, +2), Mn₂O₃ (amphoteric, +3), MnO₂ (amphoteric, +4), Mn₂O₇ (acidic, +7).