A) \[B{{r}_{2}}\]
B) \[C{{l}_{2}}\]
C) \[N{{O}_{2}}\]
D) \[HN{{O}_{3}}\]
Correct Answer: D
Solution :
Primary pollutants are the pollutants which enter the air directly from the source, eg, \[N{{O}_{2}},B{{r}_{2}},C{{l}_{2}},CO\], DDT, etc. Secondary pollutants develop from the interaction of primary pollutants and atmosphere constituents, eg, oxides of nitrogen react with atmospheric moisture (water vapour) and form \[HN{{O}_{3}}\] which results in acid rain.
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