Which of the following is an endothermic reaction?
- A$N_{2(g)} + 3 H_{2(g)} \longrightarrow 2 NH_{3(g)} + 92 \ kJ$
- B$N_{2(g)} + O_{2(g)} + 180.8 \ kJ \longrightarrow 2 NO_{(g)}$
- C$H_{2(g)} + Cl_{2(g)} \longrightarrow 2 HCl_{(g)} + 184.6 \ kJ$
- D$C_{(graphite)} + 2 H_{2(g)} \longrightarrow CH_{4(g)} + 74.8 \ kJ$
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