O-LevelChemistryChemistry of the Environment5070/12 · Oct/Nov 2020 · Q321 Mark

Gas X is present in dry air and may contribute to global warming. What is X?

Acarbon monoxide

Bmethane

Cnitrogen oxide

Dsulfur dioxide

✓ Correct answer

B: methane

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2020 Paper 1 Variant 2, question 32.

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