How many electrons are involved in the reduction of 1 mole of MnO₄⁻ to MnO₂ in basic medium?
MnO₄⁻ + 2H₂O + 3e⁻ → MnO₂ + 4OH⁻ . 3 electrons per mole.
Ref: NCERT Class 12 Chemistry > Chapter 2: Electrochemistry > Topic: Electrochemical Cells - Galvanic Cells and Electrode Potential