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Carbon monoxide (CO) is particularly dangerous because:
AIt smells very bad and warns people of leaks
BIt cools the body rapidly
CIt is colourless, odourless and combines tightly with haemoglobin, preventing oxygen transport
DIt is highly inflammable
Answer & Solution
Correct answer: C. It is colourless, odourless and combines tightly with haemoglobin, preventing oxygen transport
CO has no colour and no smell, so victims often do not notice they are inhaling it. Once in the blood, it binds to haemoglobin much more strongly than oxygen, blocking oxygen transport — even small amounts can be fatal. This is why incomplete combustion (smoky stoves in closed rooms) is so dangerous.
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