GKFix MCQ Question

Which of the following couples involves a solid reactant?

• A. AgCl(s) + e– → Ag(s) + Cl– 0.22
• B. 2H+ + 2e– → H2(g) 0.00
• C. Zn2+ + 2e– → Zn(s)
• D. Fe2+ + 2e– → Fe(s)