Reducing smog is a mixture of `:`

Options

A. Smoke, fog and `O_3`
B. Smoke, fog and `N_2 O_3`
C. Smoke, fog and `CH_2= CH - CHO`
D. Smoke, fog and `SO_2`

Answer

D

Explanation

Classical smog is a mixture of smoke, fog and `SO_2` .Chemically it is a reducing mixture and so it is called as reducing smog.