Which equation shows an endothermic reaction?
- A$\text{Cl}_2(g) \rightarrow 2\text{Cl}(g)$
- B$\text{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(l)$
- C$\text{H}(g) + \text{H}(g) \rightarrow \text{H}_2(g)$
- D$2\text{K}(s) + 2\text{H}_2\text{O}(l) \rightarrow 2\text{KOH}(aq) + \text{H}_2(g)$