Environmental Chemistry - Result Question 13

####13. The molecule that has minimum/no role in the formation of photochemical smog, is

(a) N2

(b) CH2=O

(c) NO

(d) O3

(2019 Main, 12 Jan I)

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Answer:

Correct Answer: 13. (d)

Solution:

  1. N2 molecule has minimum role in the formation of photochemical smog. While CH2=O,O3 and NO has major role. When fossil fuels are burnt, a variety of pollutants are emitted. Two of them are hydrocarbons (unburnt) and NO. When these pollutants build upto high levels, a chain reaction occurs from their interaction with sunlight. The reactions involved in the formation of photochemical smog are as follows:

NO2(g)hvNO(g)+O(g) O(g)+O2(g)O3(g) NO(g)+O3(g)NO2(g)+O2(g)

O3 reats with unburnt hydrocarbons to produce chemicals such as formaldehyde, acrolein and PAN.

3CH4+2O3CH2=O+3H2O



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