In the presence of CO, the oxygen carrying capacity of the haemoglobin:

increases

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decreases

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remains the same

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data insufficient

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Solution

The correct option is A decreases
The affinity of CO for haemoglobins much more (about 200 times) than that of oxygen. In the presence of CO, the oxygen carrying capacity of the haemoglobin decreases.

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The compound which forms a poisonous complex with haemoglobin and reduces the oxygen carrying capacity of haemoglobin is:

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