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Environmental Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEnvironmental Chemistry1 Mark
MCQ
Supersonic jets cause pollution by thinning of :
  • ✓
    $\mathrm{O}_3$ layer
  • B
    $\mathrm{SO}_2$ layer
  • C
    $\mathrm{O}_2$ layer
  • D
    $\mathrm{CO}_2$ layer
✓

Answer

Correct option: A.
$\mathrm{O}_3$ layer
$90\%$ of naturally occurring atmospheric ozone occurs in the stratosphere.
Stratospheric ozone is very important, it removes almost all incoming $\text{UVA},$ and $70\%$ of the incoming $\text{UVB}$ at equator, $90\%$ at poles.
All aircraft produce water, $\ce{CO_2​, CO}$ etc. in exhaust gases.
Most commercial flights are confined to the troposphere, but high $-$ level supersonic aircraft inject pollutants into the stratosphere, which leads to the thinning of the ozone layer. Of these nitrogen oxides are especially harmful.

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