Which of the following is most poisonous?

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(A) $CO$ (carbon monoxide) is the most poisonous among the given options.In human beings,carbon monoxide causes headaches,dizziness,and difficulty in

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$CO$

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(A) $CO$ (carbon monoxide) is the most poisonous among the given options.In human beings,carbon monoxide causes headaches,dizziness,and difficulty in breathing.Haemoglobin has a significantly greater affinity for $CO$ than for oxygen.It binds with haemoglobin to form carboxyhaemoglobin $(Hb.CO)$,which is much more stable than oxyhaemoglobin.This reduces the oxygen-carrying capacity of the blood,leading to hypoxia and potentially death.

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