A) \[S{{O}_{2}}\]
B) \[{{O}_{2}}\]
C) \[{{O}_{3}}\]
D) \[N{{O}_{2}}\]
Correct Answer: A
Solution :
\[S{{O}_{2}}\] emitted from Mathura refinery (located about 40 km from Taj Mahal) as well as from foundries, power houses and railway yards get mixed with the atmospheric moisture and get converted into sulphuric acid, which settle down on the exterior of Taj Mahal. It reacts with marble \[(CaC{{O}_{3}})\] leading to corrosion and discolouration of the monument \[N{{O}_{2}}\] is the chief constituent of photochemical smog, in metropolitant areas. It is highly injurious to plants. \[{{O}_{3}}\] forms a layer in stratosphere which protects us from harmful UV radiations from sun. It is also formed through chemical reactions of \[S{{O}_{2}},\,N{{O}_{2}}\] aldehyde on absorbing UV radiations. \[{{O}_{2}}\] is not a pollutant gas.
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