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14.3.    Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?

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Yes, carbon monoxide is more poisonous than carbon dioxide, (non-toxic in nature). CO has the ability to block delivery of oxygen to the organ and tissue. Also, it binds to haemoglobin to form a complex carboxyhaemoglobin, which is 300 times more stable than the oxygen-haemoglobin complex.
If the concentration of these complex reaches 3-4% then the capacity of blood to carry oxygen is reduced.
On the other hand, CO_2 is not poisonous, it is harmful only at high concentration.

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