A factory makes ammonium phosphate fertiliser using several integrated processes.
Statement 1: The nitrogen used to make ammonia comes from the air.
Statement 2: Phosphate rock is used directly because it is very soluble in water.
Statement 3: The hydrogen used to make ammonia can be made from natural gas.
Which statements are correct?
1 and 2 only
1 and 3 only
2 and 3 only
1, 2 and 3
61 exam-style questions on OCR GCSE Chemistry 6.1 Improving processes and products, covering 6.1.1 Extracting metals industrially and by electrolysis, 6.1.2 Life cycle assessment and recycling, 6.1.3 Biological methods of metal extraction, 6.1.4 The Haber process and the production of fertilisers, 6.1.5 Alloys and their uses, 6.1.6 Corrosion and its prevention, 6.1.7 Comparing and selecting materials, and 6.1.8 Industrial conditions, rate and position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.