This equation shows an equilibrium. $4\text{NH}_3(g) + 5\text{O}_2(g) \rightleftharpoons 4\text{NO}(g) + 6\text{H}_2\text{O}(g) \qquad \Delta H = -900\ \text{kJ mol}^{-1}$ Which change would raise the concentration of NO at equilibrium?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only