Short Answer Type
Long Answer TypeShort Answer TypeLong Answer TypeWhat is smog? Explain its two types.
The combination of smoke and fog is called smog. It is of two types:
(a) London smog or sulphurous smog or classical smog: London smog formation is initiated by a mixture of SO2, particulate and high humidity in the atmosphere. The chemicals present in the particulates catalyse the conversion of SO2 to SO3 which then combines with H2O of the humidity forming a fog of sulphuric acid droplets. These then condense on the surface of the particulate.
This type of smog is seen in the early morning hours of winters months.
(b) Photochemical smog or Los Angeles smog: It is formed when the air contains NO2and hydrocarbons and the mixture is exposed to sunlight. As the reaction occurs in the presence of sunlight to form the smog, it is called photochemical smog) This type of smog is formed in the months of summer (strong sunlight) during the daytime when NO2 and hydrocarbons are present in very large amounts due to heavy vehicular traffic.
Short Answer TypeLong Answer TypeWrite down the reactions involved during the formation of photochemical smog.
Or
Discuss the mechanism of photochemical smog formation.
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