For which of the following equilibria will the addition of more O2(g) cause the equilibrium to shift to the right? (i) N2(g) O2(g)⇌2NO(g) (ii) 2O3(g)⇌3O2(g) (iii) N2(g) 2O2(g)⇌2NO2(g) (iv) 2N2(g) O2(g)⇌2N2O(g)