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Carbon Monoxide

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Question

Suggest a reason as to why CO is poisonous.

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Solution

Carbon monoxide is highly-poisonous because of its ability to form a complex with haemoglobin. The CO–Hb complex is more stable than the $O_{2} - H b$ complex. The former prevents Hb from binding with oxygen. Thus, a person dies because of suffocation on not receiving oxygen. It is found that the CO–Hb complex is about 300 times more stable than the $O_{2}$ –Hb complex.

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Carbon Monoxide

Standard XII Chemistry

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