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Sticky Note
Pick up the correct statement about photochemical smog: Photo chemical smog is caused by NO2, Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours, Photo chemical smog contains nitric oxide and unburnt hydrocarbon as main reactants, Both A and B
  1. Photo chemical smog is caused by NO2
  2. Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours
  3. Photo chemical smog contains nitric oxide and unburnt hydrocarbon as main reactants
  4. Both A and B
Explanation

Photochemical smog is mainly caused by NO₂ reacting with sunlight and hydrocarbons.

It forms during daytime due to sunlight, while classical (sulfurous) smog forms in cold mornings.

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