Paper 1 · People, Development and Environment
UGC NET December 2022 (24.02.2023) Shift-I
Which of the following play a role during the formation of photochemical smog?
- NO2 (nitrogen dioxide)
- Black carbon
- Sunlight
- VOCs (volatile organic compounds)
- CO (carbon monoxide)
A1, 2 & 3 only
B1, 3 & 4 only ✓ Correct
C1, 4 & 5 only
D2, 3, 4 & 5 only
Correct answer: (B) 1, 3 & 4 only — Photochemical smog forms from nitrogen dioxide, sunlight and volatile organic compounds, so the answer is 1, 3 and 4.
Explanation
★Photochemical smog forms from nitrogen dioxide, sunlight and volatile organic compounds, so the answer is 1, 3 and 4.
★Photochemical smog is a brown haze made in warm, sunny conditions.
★Nitrogen dioxide from vehicle exhaust is a key reactant, matching item 1.
★Sunlight drives the chemical reactions, matching item 3.
★Volatile organic compounds react with these to form the smog, matching item 4.
★Black carbon and carbon monoxide are not the reactants that form photochemical smog.
★So the answer is items 1, 3 and 4.
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