Question Detail
Question
When the equation MnO₄⁻ + Fe²⁺ → Mn²⁺ + Fe³⁺ is balanced in acidic medium, the coefficient for Fe²⁺ is:
Correct Answer
Option D is the correct answer.
Detailed Explanation
Balanced half-reactions: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O and Fe²⁺ → Fe³⁺ + e⁻ (×5). Combined: MnO₄⁻ + 5Fe²⁺ + 8H⁺ → Mn²⁺ + 5Fe³⁺ + 4H₂O. Coefficient of Fe²⁺ is 5.
Hint
Balance the electrons lost and gained.