GKFix MCQ Question

Which of the following reactions is endothermic?

• A. C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l); ∆rH° = –1367 kJ mol⁻¹
• B. H₂(g) + ½O₂(g) → H₂O(l); ∆rH° = –285.8 kJ mol⁻¹
• C. CaCO₃(s) → CaO(s) + CO₂(g); ∆rH° = +178.3 kJ mol⁻¹
• D. C(graphite, s) + 2H₂(g) → CH₄(g); ∆rH° = –74.81 kJ mol⁻¹