O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2024 · Q321 Mark

NPK fertilisers are used to improve plant growth. A solid NPK fertiliser has the properties listed: • water soluble • has an aqueous solution with pH 7. Which substances are mixed to make a solid NPK fertiliser?

Aammonium nitrate, potassium sulfate and phosphorus oxide

Bammonium phosphate and potassium hydroxide

Cammonium sulfate, calcium nitrate and sodium phosphate

Dpotassium nitrate and sodium phosphate

✓ Correct answer

D: potassium nitrate and sodium phosphate

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2024 Paper 1 Variant 1, question 32.

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