ElectrochemistryAnode and Cathode Reactions31Choose the best answerWhich reaction occurs at the cathode?ACu²⁺ + 2e⁻ → CuBCu → Cu²⁺ + 2e⁻CHg + ½O₂ → HgODMg + ½O₂ → MgO Like 0 Discuss 0Share
ElectrochemistryBalancing Redox Reactions by Ion-Electron Method32Choose the best answerFor the reduction half-reaction MnO₄⁻ → Mn²⁺ in acidic medium, the number and position of electrons are:A5e⁻ on the rightB5e⁻ on the leftC3e⁻ on the rightD3e⁻ on the left Like 0 Discuss 0Share
ElectrochemistryElectron Transfer and Oxidation Number Change33Choose the best answerWhich change involves transfer of five electrons per metal atom?AMnO₄²⁻ → MnO₂BCrO₄²⁻ → Cr³⁺CMnO₄⁻ → Mn²⁺DCr₂O₇²⁻ → 2Cr²⁺ Like 0 Discuss 0Share
ElectrochemistryBalancing Redox Reactions by Ion-Electron Method34Choose the best answerTo balance the half-reaction MnO₂ + 4H⁺ → Mn²⁺ + 2H₂O, electrons must be added as:A2e⁻ on the left sideB2e⁻ on the right sideC4e⁻ on the left sideD4e⁻ on the right side Like 0 Discuss 0Share
ElectrochemistryRules and Exceptions of Oxidation Number35Choose the best answerThe oxidation states of oxygen in OF₂ and H₂O₂ are respectively:A−2, −1B+2, −1C−1, +2D+2, +1 Like 0 Discuss 0Share