Practise AQA GCSE Chemistry 10.4 The Haber process and the use of NPK fertilisers with exam-style questions for Foundation and Higher tier. 8 questions covering 10.4.1 The Haber process and 10.4.2 Production and uses of NPK fertilisers, matched to the AQA GCSE Chemistry (8462) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.