Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ?
Correct answer: C. Both A. & B.
- A. Nitrogen oxides
- B. Hydrocarbons
- C. Both A. & B.
- D. Carbon monoxide
Explanation
Photochemical smog forms when nitrogen oxides react with hydrocarbons in sunlight, producing ozone and other oxidants. Both emissions are therefore essential contributors, not carbon monoxide alone.
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