GKFix MCQ Question

Why does copper's positive E°(M2+/M) value prevent it from liberating H2 from acids?

• A. Because copper does not form ions.
• B. Because the reaction has a positive cell potential, making it spontaneous.
• C. Because copper is less reactive than hydrogen.
• D. Because the reaction Cu + 2H+ → Cu2+ + H2 would have a negative cell potential, making it non-spontaneous.