Question

Carbon monoxide emitted by automobiles is poisonous because?

• A. It changes $O_2$ to $C{O}_2$.
• B. It prevents breathing.
• C. It reduces oxygen carrying capacity of blood.
• D. It makes it difficult to see.

Answer 1

The correct option is C It reduces oxygen carrying capacity of blood.

Carbon monoxide mainly causes adverse effects in humans by combining with haemoglobin in the blood and preventing it from carrying oxygen to the tissues.

So, option C is correct.