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CAIE A-Level Chemistry AS 12.1.3 Nox Sources and Catalytic Removal Questions

Practise identifying natural and human NOx sources and explaining their reduction in vehicle catalytic converters.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Identify natural lightning and man-made combustion or power-station sources of nitrogen oxides.
  • Explain that high-temperature reaction of atmospheric N₂ and O₂ forms NOx, and write or interpret the relevant formation equation.
  • Explain catalytic-converter removal of NOx by reduction with CO or other exhaust reductants, including a balanced equation and catalyst role.

CAIE A-Level Chemistry AS 12.1.3 Nox Sources and Catalytic Removal Questions question 1

[Maximum number: 2]

Nitrogen and phosphorus are elements in Group 15 of the Periodic Table.

Nitrogen is found in inorganic compounds such as nitrogen oxides ( NOx\mathrm{NO}_{x} ), nitrates and nitric acid.

Identify one natural and one man-made occurrence of nitrogen oxides in the atmosphere.
natural
man-made

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