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Doctors Medicines MCQs Q&A

  1. Sulfur oxides
  2. Carbon monoxide
  3. Nitrogen oxides
  4. Silicon oxides
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1 Answers

Option 3 : Nitrogen oxides

The Correct Answer is Nitrogen oxides.

  • Photochemical smog is a brownish-grey haze caused by the action of ultraviolet solar radiation on atmospheres contaminated with hydrocarbons and nitrogen oxides.
  • It includes anthropogenic air contaminants, especially ozone, nitric acid, and organic compounds that are trapped by temperature inversion near the ground.
  • These and also some other contaminants can affect human health and cause plant damage. Because of some of its gaseous components, photochemical smog also has an unpleasant odor.
  • It appears that photochemical smog is caused by nitrogen oxides released into the air as contaminants primarily from internal combustion engines.
  • Absorbing ultraviolet energy, it forms nitric oxide (NO) into free oxygen atoms (O), which then combine with molecular oxygen (O2) to form ozone (O3).
  • Different chemical reactions to create photochemical smog occur in the presence of hydrocarbons (other than methane), some other organic compounds, and sunlight.
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