GKFix MCQ Question

Which of the following reactions is exothermic?

• A. CaCO₃(s) → CaO(s) + CO₂(g); ∆rH° = +178.3 kJ mol⁻¹
• B. C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l); ∆rH° = –1367 kJ mol⁻¹
• C. H₂(g) + ½Br₂(l) → HBr(g); ∆rH° = –36.4 kJ mol⁻¹
• D. All of the above