Class 11 Chemistry - Chapter Environmental Chemistry NCERT Solutions | Write down the reactions involved during

Welcome to the NCERT Solutions for Class 11th Chemistry - Chapter Environmental Chemistry. This page offers a step-by-step solution to the specific question from Excercise ".$ex_no." , Question 7: write down the reactions involved during the forma....
Question 7

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

Answer

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:

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.

3CH4  +  2O3  →  3CH2=O   +  3H2O

                           formaldehyde

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