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Which of the following oxides of manganese is amphoteric in nature?

1. MnO₂
2. Mn₃O₄
3. Mn₂O₇
4. MnO

Correct answer: MnO₂

Solution

MnO2 (Mn in +4 state) reacts with both acids and bases, making it amphoteric, whereas MnO is basic and Mn2O7 is acidic.

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