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NEET levelSingle correct optionDifficulty 1 of 3ev005

Classical (London type) smog is called reducing smog mainly because it contains

  1. APAN, which is a reducing agent
  2. B, which is a reducing agent
  3. C, which is a reducing agent
  4. D, which is a reducing agent

Answer: D

Classical smog arises from smoke and fog with a high level of sulphur dioxide. can be oxidised (S goes from +4 to +6), so the smog is reducing. Photochemical smog contains the oxidising species and PAN.
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