Chemistry · Oct / Nov 2022 · Paper 12 · Question 35

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?

1. ADecreased levels of mineral salts caused the eutrophication.
2. BDesalination of the river water occurred.
3. CIncreased levels of phosphates caused the eutrophication.
4. DOxygen levels in the river water increased.

As printed in the paper