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Practice mode Electrochemistry

In neutral or weakly basic solution MnO₄⁻ is reduced to MnO₂. What is the change in the oxidation number of manganese?

Correct answer A. Decrease by 3

Explanation

Manganese is +7 in MnO₄⁻ and +4 in MnO₂, so its oxidation number decreases by 3 and each Mn atom gains three electrons.

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