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a
Photochemical smog causes irritation in eyes
b
Classical smog is a mixture of smoke and fog
c
Photochemical smog results in the formation of PAN
d
Classical smog is oxidising in nature
answer is D.
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Detailed Solution
Classical smog occurs in cool humid climate. It is a mixture of smoke, fog and sulphur dioxide. Chemically it is a reducing mixture and so it is also called as reducing smog.