Which one of the following reactions will be spontaneous at high temperature, but not spontaneous at low temperature?
Pb(s) + N2(g) → Pb(N3)2(s)
2 Li(s) + Cl2(g) → 2 LiCl(s)
N2(g) + 3 H2(g) → 2 NH3(g)
NH4NO3(s) → NH4+(aq) + NO3-(aq)
NH4Cl(s) → NH3(g) + HCl(g)