Q. One of the following acts as secondary pollutant
A) $Br_{2}$
B) $Cl_{2}$
C) $NO_{2}$
D) $HNO_{3}$
Explanation
Primary pollutants are the pollutants which enter the air directly from the source, e.g., $NO_{2},Br_{2},Cl_{2},CO,DDT,$ etc. Secondary pollutants develop from the interaction of primary pollutants and atmosphere constituents, e.g., oxides of nitrogen react with atmospheric moisture (water vapour) and from $HNO_{3}\$which results in acid rain.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.