Multiple choice

Which one of the following gas is not a constituent of air?

  1. Sulphur dioxide

  2. Nitrogen

  3. Oxygen

  4. Carbon dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sulphur dioxide is not a natural component of clean air - it's a pollutant produced by burning fossil fuels and volcanic activity. The main constituents of air are nitrogen, oxygen, argon, and carbon dioxide.

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