The GATE Grind

GATE 2016 CE (CE1) – Question 27

Air Pollution and Municipal Solid Wastes · Air pollution: pollutants, sources, impacts, control and air quality index · 1 mark · Multiple choice

Pre-cursors to photochemical oxidants are

  1. NOX, VOCs and sunlight
  2. SO2, CO2 and sunlight
  3. H2S, CO and sunlight
  4. SO2, NH3 and sunlight

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Correct answer: (A) NOX, VOCs and sunlight

Explanation

Nitrogen oxides and volatile organic compounds react under sunlight through chains that generate ozone and other oxidants. These are the characteristic precursors of photochemical smog. Thus **NOx and VOCs, A**, is the appropriate pair; suspended dust alone does not describe this mechanism.