Pollutant that reduces $O_{2}$ -carrying capacity of blood is

S O_{2}

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C O_{2}

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None of the above

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Solution

The correct option is A CO
Carbon monoxide destroys the oxygen-binding and oxygen-carrying capacity of the respiratory pigment haemoglobin because it binds with it irreversibly to form the compound called the carboxyhemoglobin. This compound binds to the available oxygen as well but does not release it to the tissues. Because of this, the body tissues suffocate in a deficiency of the oxygen. This process is called carbon monoxide poisoning, that results in death.
Hence, the correct answer is 'CO'.

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