Q91 / 180 · AIIMS 2003 · Chemistry

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

  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion
  • Correct answer
    B
    If both assertion and reason are true and the reason is not the correct explanation of the assertion
  • C
    If assertion is true but reason is false
  • D
    If both assertion and reason are false.

Solution

$\mathrm{NO}_2+\mathrm{U} . \mathrm{V}$. light $\rightarrow \mathrm{NO}+\mathrm{O}$ Atomic oxygen produced as above reacts with hydrocarbons to give a variety of free hydrocarbon radicals aldehyde, ketones, $\mathrm{O}_3$, 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.

Hence, the correct answer is option: 'B'.

More Environmental Chemistry Questions