Which of the following reactions associated with nitrogen fixation by lightening is a disproportionation reaction?
I. N2(g) + O2(g) → 2NO(g)
II. 2NO(g) + O2(g) → 2NO2(g)
III. 2NO2(g) + H2O(l) → HNO2(aq) + HNO3(aq)
◦ I, II, and III
◦ II and III
◦ I and II
◦ I and III
◦ III only