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Question

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

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Solution

Carbon dioxide (CO2) and carbon monoxide (CO) gases are emitted during the combustion of various fuels. Carbon monoxide is poisonous, whereas carbon-dioxide is non-toxic in nature.

Carbon monoxide is poisonous because it is capable of forming a complex with hemoglobin (carboxyhemoglobin), which is more stable than the oxygen-hemoglobin complex. The concentration range of 3-4% of carboxyhemoglobin decreases the oxygen-carrying capacity of blood. This results in headaches, weak eyesight, nervousness, and cardiovascular disorders. A more increased concentration may even lead to death. Compare to Carbon monoxide, the Carbon dioxide is not much poisonous than Carbon monoxide. It proves harmful only at very high concentrations.


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