Which reaction is endothermic?

Question

C + O2 → CO2 C + O 2 → CO 2 N2 + O2 → 2NO N 2 + O 2 → 2NO S + O2 → SO2 S + O 2 → SO 2 2CO + O2 → 2CO2 2CO + O 2 → 2CO 2

Answer 1

The reaction S + O2 → SO2 is endothermic.