GKFix MCQ Question

Which of the following reactions has a ∆rH⁰ equal to the ∆fH⁰ of CO₂(g)?

• A. C(diamond, s) + O₂(g) → CO₂(g)
• B. CO(g) + ½O₂(g) → CO₂(g)
• C. C(graphite, s) + O₂(g) → CO₂(g)
• D. CaCO₃(s) → CaO(s) + CO₂(g)