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