When acidified MnO₄⁻ oxidises Fe²⁺ to Fe³⁺ (MnO₄⁻ being reduced to Mn²⁺), what is the mole ratio Fe²⁺ : MnO₄⁻ in the balanced equation?
Correct answer C. 5 : 1
Explanation
Mn changes from +7 to +2, gaining 5 electrons, while each Fe²⁺ loses 1 electron. Five Fe²⁺ are needed per MnO₄⁻: MnO₄⁻ + 5Fe²⁺ + 8H⁺ → Mn²⁺ + 5Fe³⁺ + 4H₂O.
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