Fertilisers: past paper questions

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• Question 32May/June 2026, paper 11Multiple choice1 mark

  An NPK fertiliser is made by mixing two compounds. One of the compounds is $\mathrm{C}\mathrm{a}({\mathrm{H}}_2{\mathrm{P}\mathrm{O}}_4{)}_2$. What is the other compound?

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• Question 27Oct/Nov 2025, paper 13Multiple choice1 mark

  NPK fertilisers are mixtures of salts used to improve plant growth. Which salt could be used as a component of an NPK fertiliser?

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• Question 34Oct/Nov 2024, paper 13Multiple choice1 mark

  Fertilisers are mixtures of different compounds used to increase the growth of crops. Which pair of substances contain the three essential elements for plant growth?

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• Question 29Oct/Nov 2023, paper 11Multiple choice1 mark

  Which mixture of salts produces an NPK fertiliser?

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• Question 16May/June 2026, paper 12Multiple choice1 mark

  Farmers add calcium oxide (lime) and ammonium salts to their fields. The compounds are not added at the same time because they react with each other. Which gas is produced in this reaction?

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• Question 3Oct/Nov 2025, paper 31Structured9 marksHas a diagram

  Table 3.1 shows the masses of ions, in mg, present in a $1000{\text{ cm}}^3$ sample of river water. Table 3.1 Answer these questions using the information from Table 3.1. Name the positive ion that has the highest concentration.

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• Question 15Oct/Nov 2024, paper 21Multiple choice1 mark

  Which statements about the Haber process are correct?

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• Question 32Oct/Nov 2023, paper 12Multiple choice1 mark

  Which two compounds can be mixed together to form an NPK fertiliser?

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• Question 24May/June 2026, paper 12Multiple choice1 mark

  Which alkali and acid react to produce a salt in which both the cation and anion are used to make a fertiliser?

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• Question 30May/June 2025, paper 11Multiple choice1 mark

  Fertilisers are used to provide the three elements needed for improved plant growth. Which two compounds would provide all three of these elements?

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• Question 28Oct/Nov 2024, paper 22Multiple choice1 mark

  Which mixture contains all of the elements in a typical NPK fertiliser?

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• Question 31Oct/Nov 2023, paper 13Multiple choice1 markHas a diagram

  Two tests are done on an NPK fertiliser. test 1 flame test test 2 heat with aqueous sodium hydroxide and aluminium foil Which observations are made?

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• Question 31May/June 2026, paper 13Multiple choice1 mark

  ‘Fastgrow’ is an NPK fertiliser containing elements essential for improved plant growth. Which mixture of substances is used to make ‘Fastgrow’?

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• Question 32May/June 2025, paper 13Multiple choice1 mark

  Farmers use fertilisers to replace elements in the soil that have been removed by the crops they grow. Which elements in the soil are replaced by adding fertilisers?

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• Question 1Oct/Nov 2023, paper 31Structured6 marks

  A list of substances is shown. ammonium nitrate carbon monoxide copper(II) chloride ethane ethene litmus methane methyl orange sodium chloride sodium sulfate sulfur dioxide thymolphthalein Answer the following questions using only the substances from the list.

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• Question 18May/June 2026, paper 21Multiple choice1 mark

  Four statements about the Haber process and the Contact process are listed. 1 Both processes are carried out at $200\text{ kPa}$. 2 Both processes are carried out at $450{}^{\circ }\text{C}$.

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• Question 16May/June 2025, paper 21Multiple choice1 mark

  Industrially, ammonia is made by the Haber process. The equation is shown. $${\mathrm{N}}_2(\mathrm{g})+3{\mathrm{H}}_2(\mathrm{g})\rightleftharpoons 2\mathrm{N}{\mathrm{H}}_3(\mathrm{g})\mathrm{\Delta }H=-92\text{ kJ/mol}$$ The conditions used are $450{}^{\circ }\text{C}$ and $200\text{ atm}$.

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• Question 30May/June 2023, paper 11Multiple choice1 mark

  Which pair of compounds make an NPK fertiliser?

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• Question 29May/June 2026, paper 21Multiple choice1 mark

  Which mixture of salts can be used as an NPK fertiliser?

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• Question 30May/June 2025, paper 21Multiple choice1 markHas a diagram

  Nitrogen, phosphorus and potassium are essential elements for improved plant growth. Which mixture provides all three essential elements?

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• Question 30May/June 2024, paper 11Multiple choice1 mark

  Which substance contains two elements that are found in NPK fertilisers?

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• Question 30May/June 2023, paper 12Multiple choice1 mark

  Urea, ${\mathrm{C}\mathrm{O}(\mathrm{N}\mathrm{H}}_2{)}_2$, is used as a fertiliser. Which element that plants need for improved plant growth is provided by urea?

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• Question 17May/June 2026, paper 22Multiple choice1 mark

  The Haber process is used to make ammonia. The equation for the reaction is shown. $${\text{N}}_2+3{\text{H}}_2\rightleftharpoons 2{\text{NH}}_3$$ Which statements about the Haber process are correct?

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• Question 31May/June 2024, paper 12Multiple choice1 mark

  Which compound can be added to ammonium sulfate to make an NPK fertiliser?

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• Question 30May/June 2023, paper 13Multiple choice1 mark

  Which substance is used by farmers to improve plant growth?

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• Question 7May/June 2026, paper 31Structured10 marks

  State the percentage of clean, dry air that is nitrogen.

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• Question 3May/June 2025, paper 32Structured11 marksHas a diagram

  This question is about phosphorus and its compounds. Phosphorus is in Group V of the Periodic Table. Explain why phosphorus is placed in this group.

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• Question 29May/June 2023, paper 23Multiple choice1 mark

  Which statements about water are correct?

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• Question 7May/June 2026, paper 32Structured12 marksHas a diagram

  Natural water sources can be polluted by nitrates and some metal compounds. State one source of nitrates that pollute natural water sources.

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• Question 24May/June 2024, paper 21Multiple choice1 mark

  Which gas is produced when ammonium chloride is warmed with aqueous sodium hydroxide?

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