Environmental Chemistry - Result Question 2

####2. The correct set of species responsible for the photochemical smog is

(2019 Main, 12 April I)

(a) N2,NO2 and hydrocarbons

(b) CO2,NO2,SO2 and hydrocarbons

(c) NO,NO2,O3 and hydrocarbons

(d) N2,O2,O3 and hydrocarbons

Show Answer

Answer:

Correct Answer: 2. (c)

Solution:

  1. The correct set of species responsible for the photochemical smog is NO,NO2,O3 and hydrocarbons. Photochemical smog appears in warm, dry and sunny climate which are obtained by the action of sunlight on unsaturated hydrocarbons and nitrogen oxides. Following reactions are involved during the formation of photochemical smog.

(i) N2(g)+O2(g)2NO(g)

(Originates from

burning of fossil fuels)

(ii) 2NO(g)+O2(g) Sunlight 2NO2(g)

NO2(g)hvNO(g)+[O]

(iii) O(g)+O2(g)O3(g)

 Reacts rapidly with NO 

O3(g)+NO(g)NO2(g)+O2(g) Brown gas (in high   concentration form haze)  3CH4(g) (Unburnt hydrocarbon) +2O3(g)3CH2=O(g) Formaldehyde  +CH2=CHCH Acrolein =O+H2O



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