Nitrogen can form several oxides. The enthalpies of formation are listed below. $\Delta H_f^\circ(\text{NO}(g)) = +90\,\text{kJ mol}^{-1}$ $\Delta H_f^\circ(\text{N}_2\text{O}(g)) = +82\,\text{kJ mol}^{-1}$ $\Delta H_f^\circ(\text{NO}_2(g)) = +33\,\text{kJ mol}^{-1}$ Which of the following statements are true?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only