CAIE IGCSE Chemistry 10.2.2 Use of Npk Fertilisers to Provide the Questions

Work through real CAIE IGCSE Chemistry questions to identify NPK elements and select compound combinations that provide all three for crop 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]

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

$\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}$ and $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}$

$\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}$ and $\left(\mathrm{NH}_{4}\right)_{3} \mathrm{PO}_{4}$

$\mathrm{KNO}_{3}$ and $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}$

$\mathrm{KNO}_{3}$ and $\left(\mathrm{NH}_{4}\right)_{3} \mathrm{PO}_{4}$

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CAIE IGCSE Chemistry 10.2.2 Use of Npk Fertilisers to Provide the Questions question 1