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Write Down the Reactions Involved During the Formation of Photochemical Smog. - CBSE (Science) Class 11 - Chemistry

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Question

Write down the reactions involved during the formation of photochemical smog.

Solution

Photochemical smog is formed as a result of the reaction of sunlight with hydrocarbons and nitrogen oxides. Ozone, nitric oxide, acrolein, formaldehyde, and peroxyacetyl nitrate (PAN) are common components of photochemical smog. The formation of photochemical smog can be summarized as follows:

Burning of fossil fuels leads to the emission of hydrocarbons and nitrogen dioxide in the atmosphere. High concentrations of these pollutants in air results in their interaction with sunlight as follows:

`NO_(2g)`             `NO_(g) + O_(g)`

Nitrogen dioxide                      Nitric oxide

`O_(g) + O_(2(g)) ↔ O_(3(g))`

`O_(3(g)) + NO_(g)  -> NO_(2(g)) + O_(2(g))`

While ozone is toxic in nature, both NO2 and O3 are oxidizing agents. They react with the unburnt hydrocarbons in air to produce formaldehyde, PAN, and acrolein.

`3CH_4 + 2O_3 -> 3CH_2 =O + 3H_2O`

                         Formaldehyde

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 11 (2018 to Current)
Chapter 14: Environmental Chemistry
Q: 7 | Page no. 413
Solution Write Down the Reactions Involved During the Formation of Photochemical Smog. Concept: Atmospheric Pollution - Tropospheric Pollution - Particulate Pollutants.
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