Suggest a reason as to why CO is poisonous. - Vidyadip

Question

Suggest a reason as to why CO is poisonous.

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Answer

Carbon monoxide is a colourless, odourless gas which has a tendency to bind to hemoglobin (the oxygen carrying molecule in blood), forming a complex called carboxyhemoglobin. This complex is 300 times more stable than oxyhemoglobin complex and therefore, if once, formed can seriously hamper the oxygen supply to different organs and ultimately can cause death. This is why CO is said to be so dangerous.

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