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Environmental Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEnvironmental Chemistry1 Mark
MCQ
$\text{PAN}\ ($peroxyacetyl nitrate$)$ is an important constituent of photochemical smog. It is :
  • A
    Primary pollutant.
  • ✓
    Secondary pollutant.
  • C
    Natural pollutant.
  • D
    Corollary pollutant.
✓

Answer

Correct option: B.
Secondary pollutant.
$\text{PAN}$ is an important constituent of photochemical smog which are powerful respiratory and eye irritants.
These are secondary pollutants, which means they are not emitted directly but they are formed from other pollutants by chemical reactions in the atmosphere.
Free radical reactions catalyzed by ultraviolet light from the sun oxidize unburned hydrocarbons to aldehydes, ketones, and dicarbonyl compounds, whose secondary reactions create peroxyacyl radicals, which combine with nitrogen dioxide to form peroxyacyl nitrates.

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