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CAIE A-Level Chemistry 12.1.3 Sources and Removal of NOx

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 lightning as a natural NOx source and internal-combustion engines as a human source
  • state that nitrogen oxides are reduced on a catalytic-converter surface while CO or hydrocarbons are oxidised
  • write or interpret an overall converter equation that forms N2 with CO2 and/or H2O

12.1.3—NOx sources and catalytic removal 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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