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It's very strong in acidic medium. Does it have low or nil oxidizing ability in neutral and basic media?

Does heating solid $\ce{MnO2}$ give it better oxidizing properties?

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It certainly is powerful oxidizer when heated! Thermite can be made with powdered aluminum and $\ce{MnO2}$, and is at least as spectacular as with $\ce{Fe2O3}$ as the oxidant.

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