GKFix MCQ Question

Why is the E°(M3+/M2+) value for Iron (Fe) less positive than that for Cobalt (Co)?

• A. Fe3+ is smaller than Co3+
• B. Fe3+ has a higher charge density
• C. Fe2+ is more stable than Co2+
• D. Fe3+ (d5) is less stable than Co3+ (d6) relative to their M2+ states