Multiple choice

Which of the following gases has pungent suffocating odour?

  1. CO

  2. CO2

  3. O2 gas

  4. SO2

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sulphur dioxide is a colourless gas with a pungent, suffocating odour. It is a dangerous air pollutant because it is corrosive to organic materials and it irritates the eyes, nose and lungs.