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NEET2003ChemistryEnvironmental ChemistryActual

Assertion : Photochemical smog is produced by nitrogen oxides. Reason : Vehicular pollution is a major source of nitrogen oxides.

Options

  1. AIf both assertion and reason are true and the reason is the correct explanation of the assertion
  2. BIf both assertion and reason are true and the reason is not the correct explanation of the assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

B. If both assertion and reason are true and the reason is not the correct explanation of the assertion

Step-by-step solution

NO ₂+ U . V . light NO + O Atomic oxygen produced as above reacts with hydrocarbons to give a variety of free hydrocarbon radicals aldehyde, ketones, O ₃ , peroxyacetyl nitrate (PAN) etc. PAN mixes with the fog and gets condensed on smoke or dust particles in the air to form a smog which is called photochemical smog.

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