Carbon monoxide can kill a person because of it's extremely high affinity for

haemoglobin

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phytochrome

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cytochrome

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none of these.

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Solution

The correct option is A haemoglobin
Carbon monoxide combines with Hb far more readily than $O_{2}$ (CO has about 200 times greater affinity for Hb as compared to $O_{2}$ ), forming a relatively stable compound carboxyhaemoglobin. This causes low supply of $O_{2}$ to the body cells leading to headache, nausea, dizziness, paralysis and even death.

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