The Haber Process Quiz

1. Which balanced equation represents the Haber process?

a) N₂(g) + H₂(g) → NH₃(g)
b) N₂(g) + O₂(g) ⇌ 2NO(g)
c) N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
d) 2NH₃(g) ⇌ N₂(g) + 3H₂(g) + energy

2. Where do the raw materials for the Haber process usually come from?

a) Hydrogen from natural gas by steam reforming, nitrogen from air
b) Hydrogen from sea water electrolysis, nitrogen from limestone
c) Both hydrogen and nitrogen from air
d) Hydrogen from crude oil cracking, nitrogen from ammonia

3. Which statement about the forward reaction in the Haber process is correct?

a) It is endothermic and produces more moles of gas
b) It is endothermic and produces fewer moles of gas
c) It is exothermic and produces more moles of gas
d) It is exothermic and produces fewer moles of gas

4. In the Haber process, the reaction between nitrogen and hydrogen is , meaning it can go in both directions and reach an equilibrium mixture.

5. The Haber process temperature that is neither too high or too low, that is it is a uses a temperature and a pressure to balance yield, rate and cost.

6. According to Le Chatelier’s principle, what is the effect of increasing pressure on the Haber process equilibrium?

a) It shifts equilibrium to the left, producing less ammonia
b) It shifts equilibrium to the right, producing more ammonia
c) It has no effect on equilibrium position
d) It only affects the rate, not the yield

7. What is the main role of the iron catalyst in the Haber process?

a) It increases the equilibrium yield of ammonia
b) It decreases the activation energy and lowers the equilibrium temperature
c) It changes the value of K_eq for the reaction
d) It provides an alternative route with lower activation energy, speeding up the rate without changing the equilibrium yield

8. Why are unreacted nitrogen and hydrogen recycled through the reactor in the Haber process?

a) To cool the reactor and keep the temperature low
b) To increase the overall percentage of reactants converted into ammonia
c) To remove impurities such as oxygen
d) To keep the pressure inside the reactor constant

9. The usual compromise temperature used in the Haber process is about °C.

10. Which statement about temperature and yield in the Haber process is correct?

a) Very low temperatures give very high yields and very fast rates
b) Very high temperatures give higher yields and faster rates
c) Lowering the temperature increases equilibrium yield but makes the rate slower
d) Temperature only affects rate, not equilibrium yield