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JEE Main · 2022 · 27 Jun 2022 · Shift 1 · Environmental Chemistry

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Given below are two statements:

Statement I: Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide

Statement II: Photochemical smog has components, ozone, nitric oxide, acrolein, formaldehyde, PAN etc.

In the light of above statements, choose the most appropriate answer from the options give below
  1. (A)Both Statement I and Statement II are correct✓ Correct
  2. (B)Both Statement I and Statement II are incorrect
  3. (C)Statement I is correct but statement II is incorrect
  4. (D)Statement I is incorrect but Statement II is correct

Answer: (A)

Solution

Both statements are correct:

Statement I: Classical (London-type) smog occurs in cool, humid climates and is a reducing mixture containing smoke, fog, and sulfur dioxide from coal burning.

Statement II: Photochemical (Los Angeles-type) smog forms in warm, sunny conditions and contains ozone (), nitric oxide (NO), nitrogen dioxide (), acrolein, formaldehyde (HCHO), and peroxyacetyl nitrate (PAN) formed by photochemical reactions of hydrocarbons and nitrogen oxides.
Structure PAN structure
PAN structure

JEE Main · 2022 · 27 Jun 2022 · Shift 1 · Single correct option

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