A temperature of about 450 ∘C450\ ^\circ\text{C}450 ∘C is used in the Haber process rather than a lower temperature. Why is a lower temperature not used?
A lower temperature would give a lower yield at equilibrium
A lower temperature would stop the catalyst from working
A lower temperature would make the reaction irreversible
A lower temperature would give a lower rate of reaction
39 exam-style questions on AQA GCSE Chemistry 10.4 The Haber process and the use of NPK fertilisers, covering 10.4.1a The Haber process, 10.4.1b Equilibrium and rate in the Haber process, and 10.4.2 Production and uses of NPK fertilisers. Each one has a worked solution and a mark scheme showing where the marks go.