GKFix MCQ Question

Which of the following can reduce H⁺ to H₂?

• A. Cu2+ + 2e– → Cu(s) 0.34
• B. Ag+ + e– → Ag(s) 0.80
• C. Zn2+ + 2e– → Zn(s) –0.76
• D. Hg2+ + e– → Hg22+ 0.92