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Electrochemistry Balancing Redox Reactions by Ion-Electron Method

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To balance the half-reaction MnO₂ + 4H⁺ → Mn²⁺ + 2H₂O, electrons must be added as:

Verified Answer & Explanation⌄

Correct Answer: A) 2e⁻ on the left side

Concept Explanation

Mn changes from +4 in MnO₂ to +2 in Mn²⁺, so it gains 2 electrons: MnO₂ + 4H⁺ + 2e⁻ → Mn²⁺ + 2H₂O.

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