Multiple choice

Which one of the following is present in the emission from unleaded petrol?

  1. Carbon monoxide

  2. Carbon dioxide

  3. Hydrocarbons

  4. Ethylene
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Unleaded petrol emissions contain hydrocarbons from incomplete combustion, which contribute to photochemical smog formation. While carbon monoxide and carbon dioxide are also present, the question specifically identifies hydrocarbons as characteristic components. Ethylene is not typically cited as a major emission component.

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