Multiple choice

Which one of the following is not required for the formation of photochemical smog?

  1. Oxygen

  2. Oxide of nitrogen

  3. Carbon monoxide

  4. Sun light
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A Correct answer
Explanation

Photochemical smog formation requires nitrogen oxides, volatile organic compounds, and sunlight to drive the chemical reactions. While oxygen is present in the atmosphere and participates in oxidation processes, it is not a specific requirement for photochemical smog formation like the other three components.

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