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Atmospheric Pollution — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYAtmospheric Pollution5 Marks
Question
How do the oxides of nitrogen enter the atmosphere?
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Answer

  • Oxides of nitrogen, nitric oxide (NO) and nitrogen dioxide ($NO_2$​​​​​​​), enter the atmosphere in the following ways:
  • On the burning of fuels in furnaces, the temperature increases. At high temperatures, nitrogen and oxygen present in the air combine to form oxides of nitrogen.
  • Oxides of nitrogen are produced during the burning of fuel in an internal combustion engine. They enter the atmosphere as exhaust gases.
  • During thunderstorms, nitric oxide is formed by the reaction between atmospheric nitrogen and oxygen in the presence of electric discharge.
  • Nitric oxide further reacts with atmospheric oxygen and ozone to form nitrogen dioxide.

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