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10.4 The Haber process and the use of NPK fertilisers

10.4 The Haber process and the use of NPK fertilisers

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Question 3

This question is about fertilizers.

Compounds containing nitrogen (N), phosphorus (P), and potassium (K) are commonly used as fertilizers to increase crop yields.

The table below shows information about three compounds, A, B, and C, that can be used as fertilizers.

CompoundNameFormulaNutrient composition by massCost (£/kg)
Compound AureaCO(NH2)2\text{CO(NH}_2)_2CO(NH2​)2​N:46%\text{N}: 46\%N:46%0.26
Compound Bpotassium chlorideKCl\text{KCl}KClK:52%\text{K}: 52\%K:52%0.32
Compound Cdiammonium phosphate(NH4)2HPO4\text{(NH}_4)_2\text{HPO}_4(NH4​)2​HPO4​N:21%\text{N}: 21\%N:21%, P:23%\text{P}: 23\%P:23%0.55

An agricultural scientist tested a sample of soil and found that:

  • The concentration of nitrogen and phosphorus in the soil was lower than the levels needed for high crop yield.
  • There was already sufficient potassium in the soil.

Evaluate the use of compounds A, B, and C to improve the crop yield for this soil.

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Markscheme

10.4 The Haber process and the use of NPK fertilisers Questions

  1. GCSE
  2. /Chemistry
  3. /10.4 The Haber process and the use of NPK fertilisers

8 exam-style questions on AQA GCSE Chemistry 10.4 The Haber process and the use of NPK fertilisers, covering 10.4.1 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.

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