O-LevelChemistryChemistry of the Environment5070/11 · May/June 2021 · Q341 Mark

Which statement about gases in the atmosphere is correct?

ACarbon monoxide is a pollutant which causes acid rain.

BCatalytic converters reduce carbon monoxide to carbon dioxide.

CMethane in the atmosphere depletes the ozone layer.

DPhotosynthesis adds oxygen to the atmosphere.

✓ Correct answer

D: Photosynthesis adds oxygen to the atmosphere.

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 1, question 34.

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