GKFix MCQ Question

In which of the following reactions is ∆H equal to ∆U?

• A. CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)
• B. 2H₂(g) + O₂(g) → 2H₂O(g)
• C. CaCO₃(s) → CaO(s) + CO₂(g)
• D. H₂(g) + Cl₂(g) → 2HCl(g)