GKFix MCQ Question

Which of the following couples represents the reduction of oxygen in basic medium?

• A. O2(g) + 4H+ + 4e– → 2H2O 1.23
• B. 2H2O + 2e– → H2(g) + 2OH– –0.83
• C. O2(g) + 2H+ + 2e– → H2O2 0.68
• D. Ag+ + e– → Ag(s) 0.80