A) acid rains
B) CFC
C) fly ash
D) smog.
Correct Answer: D
Solution :
: Fog turned dark and heavy by smoke is called smog. Smog is of two types, i.e., classical smog (or sulphur smog) and photochemical smog. Photochemical smog is a brown, opaque smog, formed as a result of photochemical reaction between hydrocarbon and oxides of nitrogen released from different engines and results in production of secondary pollutants like\[{{O}_{3}}\](ozone), PAN (peroxyacyi nitrate), phenols and aldehydes. Reaction inside engine, \[{{N}_{2}}+{{O}_{2}}\to 2NO\] Reaction in atmosphere, \[2NO+{{O}_{2}}\to 2N{{O}_{2}}\] Photochemical reactions, \[N{{O}_{2}}\xrightarrow[{}]{uv}NO+[O]{{O}_{2}}+[O]\to {{O}_{3}}\] \[NO+HC+{{O}_{2}}\to N{{O}_{2}}+PAN\]
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