GKFix MCQ Question

Which of the following reactions has a negative ∆S?

• A. CaCO3(s) → CaO(s) + CO2(g)
• B. NH4Cl(s) → NH3(g) + HCl(g)
• C. 2Cl(g) → Cl2(g)
• D. H2O(l) → H2O(g)