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

Asked by Abhisek | 1 year ago |  56

#### 1 Answer

##### Solution :-

Photochemical smog is formed due to the reaction of sunlight with nitrogen oxides and hydrocarbons. Formaldehyde, nitric oxide, ozone, PAN, acrolein are the main components of photochemical smog. The steps involved in the formation of photochemical smog are:

Hydrocarbons and nitrogen dioxide are released into the atmosphere as a result of the burning of fossil fuels. Due to high concentrations of these pollutants, they react with sunlight. The reactions proceed as shown below:

$$NO_2 \overset{h\gamma }{\rightarrow}NO + O$$

(Nitrogen dioxide)

$$O + O_2 \leftrightarrow O_3$$

$$O_3 + NO \rightarrow NO_2 + O_2$$

Since NO2 and O3 are oxidizing agents, they react with the unburnt hydrocarbons to produce acrolein, PAN and formaldehyde.

Answered by Pragya Singh | 1 year ago

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