JEE Main · 2019 · 10 Apr 2019 · Shift 2 · Environmental Chemistry

Air pollution that occurs in sunlight is:

(A)oxidising smog✓ Correct
(B)acid rain
(C)reducing smog
(D)fog

Answer: (A)

Solution

Smog that needs sunlight is photochemical, or oxidising, smog: in warm, sunny air nitrogen oxides and unburnt hydrocarbons react photochemically to build up ozone and other oxidants. The cool, damp London-type smog is the reducing kind and forms without sunlight, so the sunlight-driven pollution is oxidising smog.

JEE Main · 2019 · 10 Apr 2019 · Shift 2 · Single correct option

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