The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants ?

The pollutants which come directly in the air from sources are called

1.	The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants ?
Answer» CO Hydrocarbon Peroxyacetyl nitrate NO Solution :Hydrocarbons present in atmosphere combine with oxygen atom which produced by the photolysis of NO, to FORM highly reactive INTERMEDIATE which is known as free radical. Free radical INITIATES a SERIES of reactions. Peroxyacetyl nitrate is formed, which can be known as secondary pollutant. Hydrocarbon + O `to RCO^@` (Free radicals) `RCO^* + O_2 to RCO_3^` `RCO_3^ + NO_2 to RCO_3 NO_2`