分析下列反应，在任何温度下均能自发进行的是

A．2N2(g)＋O2(g)===2N2O(g)ΔH＝＋163 kJ·mol^－1

B．Ag(s)＋Cl2(g)===AgCl(s)ΔH＝－127 kJ·mol^－1

C．HgO(s)===Hg(l)＋O2(g)ΔH＝＋91 kJ·mol^－1

D．H2O2(l)=== O2(g)＋H2O(l)ΔH＝－98 kJ·mol^－1