Of the following equilibria, only will shift to the right in response to a decrease in volume. Of the following equilibria, only will shift to the right in response to a decrease in volume. H2 (g) + Cl2 (g) ↔ 2 HCl (g) 2 Fe2O3 (s) ↔ 4 Fe (s) + 3O2 (g) 2 SO3 (g) ↔ 2 SO2 (g) + O2 (g) N2 (g) + 3H2 (g) ↔ 2NH3 (g) 2HI (g) ↔ H2 (g) + I2 (g)