A) \[C{{O}_{2}}\]
B) \[{{N}_{2}}O\]
C) PAN
D) \[S{{O}_{2}}\]
Correct Answer: C
Solution :
Primary pollutants are those which persist in environment in the form they are passed into it. e.g., oxides of nitrogen, hydrocarbons, \[C{{O}_{2}},\text{ }S{{O}_{2}}\] Secondary pollutants are those which are formed by reaction among primary pollutants e.g.,? Peroxyacetyl nitrate (PAN) is formed by reaction between nitrogen oxides and hydrocarbons.
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