CAIE IGCSE Chemistry Nitrogen Phosphorus and Potassium Fertilisers

Practise selecting fertiliser compounds whose formulae collectively supply nitrogen, phosphorus and potassium for improved plant growth.

Exam points

state that NPK fertilisers supply nitrogen, phosphorus and potassium for plant growth
identify nitrate or ammonium compounds as nitrogen sources and phosphates as phosphorus sources
select potassium-containing compounds and combine formulae so all three elements are supplied

[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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