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CAIE A-Level Chemistry AS 12.1.4 Atmospheric Nox and Photochemical Smog Questions

Practise explaining how NO and NO2 react with unburned hydrocarbons to form PAN in photochemical smog.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Identify NO and NO₂ with unburned hydrocarbons as the pollutant pair involved in PAN formation.
  • Explain that these pollutants react to form peroxyacetyl nitrate (PAN), and identify PAN as a component of photochemical smog.

CAIE A-Level Chemistry AS 12.1.4 Atmospheric Nox and Photochemical Smog Questions question 1

[Maximum number: 1]

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.

Peroxyacetyl nitrate, PAN, is a component of photochemical smog.

Describe how PAN forms from NO2\mathrm{NO}_{2}.

3 Nitrogen and phosphorus are elements in Group 15 of the Periodic Table.
(v) Describe what is seen when solid calcium nitrate is heated strongly.
(b) A common test for nitrates is the reaction with NaOH and Al . Equation 1 shows the reaction.

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