O-LevelChemistryChemistry of the Environment5070/11 · Oct/Nov 2023 · Q301 Mark

Which statement about natural sources of water and the domestic water supply is correct?

AChlorine is used to remove tastes and odours in the treatment of the domestic water supply.

BMetal compounds from detergents can deoxygenate natural sources of water.

CPhotosynthesis provides the oxygen needed for aquatic life in natural sources of water.

DSedimentation removes nitrates in the treatment of the domestic water supply.

✓ Correct answer

C: Photosynthesis provides the oxygen needed for aquatic life in natural sources of water.

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 1, question 30.

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