GKFix MCQ Question

Which of the following reductions occurs in acidic medium?

• A. Zn2+ + 2e– → Zn(s)
• B. 2H2O + 2e– → H2(g) + 2OH–
• C. NO3– + 4H+ + 3e– → NO(g) + 2H2O
• D. Na+ + e– → Na(s)