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Why is carbon monoxide (CO) dangerous to humans?

1. It produces carbolic acid in the body
2. It leads to an increased level of carbon dioxide
3. It causes cancer
4. It binds to haemoglobin and competes with oxygen

Correct answer: It binds to haemoglobin and competes with oxygen

Solution

CO is dangerous because it binds haemoglobin much more strongly than oxygen, forming carboxyhaemoglobin and starving tissues of O2. It is not a carcinogen.

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