GKFix MCQ Question

Which of the following metals protects iron from rusting by sacrificial protection?

• A. Cu2+ + 2e– → Cu(s) 0.34
• B. Sn2+ + 2e– → Sn(s) –0.14
• C. Zn2+ + 2e– → Zn(s) –0.76
• D. Pb2+ + 2e– → Pb(s) –0.13