Previous year MCQs

General science UPPSC 1996 GS-I
Question

Which one of the following forms an irreversible complex with haemoglobin of the blood?

Answer & Solution

Answer: (Detailed Solution Below)

Option C: Carbon monoxide

Detailed Solution:

The correct answer is “Carbon monoxide”.
Carbon monoxide (CO) forms a stable complex with hemoglobin called carboxyhemoglobin. This bond is much stronger than the oxygen-hemoglobin bond, preventing oxygen from being transported to the body's tissues. This is why carbon monoxide poisoning is so dangerous.

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