O-LevelChemistryChemistry of the Environment5070/12 · Oct/Nov 2019 · Q311 Mark

Z is a pollutant gas that is formed in internal combustion engines. An aqueous solution of Z is acidic. Z is removed from the exhaust gases in a catalytic converter by reduction. What is Z?

ACO

BN2

CH2O

DNO2

✓ Correct answer

D: NO2

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2019 Paper 1 Variant 2, question 31.

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