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Which of the following reactions is exothermic?.
- A.A) H2(g) + Cl2(g) → 2HCl(g) ΔH < 0
- B.B) N2(g) + O2(g) → 2NO(g) ΔH > 0
- C.C) CaCO3(s) → CaO(s) + CO2(g) ΔH > 0
- D.D) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH < 0
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