O-LevelChemistryChemistry of the Environment5070/12 · May/June 2017 · Q331 Mark

Which list contains only gases that are always present in unpolluted air?

Aoxygen, nitrogen, carbon dioxide, argon, carbon monoxide, nitrogen dioxide

Boxygen, nitrogen, carbon dioxide, argon, neon

Coxygen, nitrogen, carbon dioxide, nitrogen dioxide, ozone

Doxygen, nitrogen, carbon monoxide, methane, sulfur dioxide

✓ Correct answer

B: oxygen, nitrogen, carbon dioxide, argon, neon

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2017 Paper 1 Variant 2, question 33.

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