CAIE IGCSE Chemistry NPK Fertiliser Questions

Practise identifying fertiliser compounds that supply nitrogen, phosphorus and potassium and selecting combinations that meet stated soil or crop needs.

Exam points

identify nitrogen, phosphorus and potassium as the three elements supplied by NPK fertilisers
inspect chemical formulae to decide which nutrient elements each fertiliser compound supplies
choose a compound combination that supplies all missing nutrients without assuming one salt supplies all three

Covered syllabus points

10.2.1—Ammonium salts and nitrates are used 10.2.2—Use of NPK fertilisers to provide the

[Maximum number: 1]

The Haber process is used to manufacture ammonia.

Ammonia reacts with an acid to form ammonium sulfate, $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}$ .

State one use of ammonium sulfate.

[Maximum number: 1]

Which chemicals can be used as a fertiliser to provide the three elements needed for improved plant growth?

$\left(\mathrm{NH}_{2}\right)_{2} \mathrm{CO}$ and KCl

$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{HPO}_{4}$ and $\mathrm{K}_{2} \mathrm{SO}_{4}$

$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{HPO}_{4}$ and $\left(\mathrm{NH}_{2}\right)_{2} \mathrm{CO}$

$\left(\mathrm{NH}_{2}\right)_{2} \mathrm{CO}$ and $\mathrm{K}_{2} \mathrm{SO}_{4}$

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Covered syllabus points

10.2 Fertilisers question 1

10.2 Fertilisers question 2