O-LevelChemistryChemistry of the Environment5070/12 · May/June 2023 · Q331 Mark

Which statement about air pollutants is correct?

ACatalytic converters in vehicles change a toxic gas into a non-toxic gas.

BFlue gas desulfurisation uses calcium nitrate.

CPhotosynthesis is a process that releases carbon dioxide.

DSulfur dioxide is responsible for photochemical smog.

✓ Correct answer

A: Catalytic converters in vehicles change a toxic gas into a non-toxic gas.

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2023 Paper 1 Variant 2, question 33.

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