A coloured gas that is known to be poisonous and can readily damage the mucous lining of the lungs is?

A. hydrogen sulphide
B. carbon(ii)oxide
C. chlorine
D. sulphur(iv)oxide

Correct Answer:

Option B – carbon(ii)oxide

Explanation

When too much carbon monoxide is in the air you’re breathing, your body replaces the oxygen in your red blood cells with carbon monoxide.