O-LevelChemistryRates of Reaction5070/12 · May/June 2015 · Q231 Mark
The equation for the reaction taking place during the production of ammonia is shown. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) ΔH = –92 kJ/mol The reaction is carried out between 350 °C and 450 °C and at around 200 atmospheres pressure using an iron catalyst. Which statement is not correct?
AAt higher temperatures the amount of ammonia present at equilibrium is less.
BChanging the pressure has no effect on the rate of reaction.
CThe catalyst is used to speed up the reaction.
DWhen the reaction is at equilibrium, the forward reaction is taking place at the same rate as the backward reaction.
✓ Correct answer
B: Changing the pressure has no effect on the rate of reaction.
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Rates of Reaction and see which topics are most likely to come up next.
Sign up free →