Q. Pick up the correct statement
A) CO plays a major role in photochemical smog
B) London smog has an oxidising character whereas Los Angeles smog is reducing in nature
C) Classical smog is good for health but photochemical somg not
D) Los Angeles smog forms in day time whereas London smog forms in early morning hours
Explanation
(d)
Classical or London type smog is formed by the combination of soot particles with oxides of sulphur while climate is cool and humid. Due to presence of soot and oxides of sulphur, it is reducing in nature.
Photochemical smog or Los Angeles smog is obtained from nitrogen oxides when climate is warm, dry and sunny. Due to presence of $O_{3}\ and\ NO_{2}$ (strong oxidising agents), it is oxidising in nature.
CO does not play any role in the formation of photochemical smog
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.