O-LevelChemistryChemistry of the Environment5070/12 · Oct/Nov 2022 · Q351 Mark

A river runs through an area of land that is used for growing cotton. The cotton farmers applied a large amount of fertiliser to their fields. This caused eutrophication in the river water. Which statement is correct?

ADecreased levels of mineral salts caused the eutrophication.

BDesalination of the river water occurred.

CIncreased levels of phosphates caused the eutrophication.

DOxygen levels in the river water increased.

✓ Correct answer

C: Increased levels of phosphates caused the eutrophication.

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2022 Paper 1 Variant 2, question 35.

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