Which of the following gases combines with haemoglobin to form carboxyhaemoglobin and reduces the oxygen carrying capacity of blood?

Carbon dioxide

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Methane

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Carbon monoxide

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Sulphur dioxide

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Solution

The correct option is C Carbon monoxide
Carbon monoxide combines with haemoglobin present in blood to form carboxyhaemoglobin due to its higher affinity towards haemoglobin than oxygen and as a result, it reduces the oxygen carrying capacity of blood. This causes headache, nausea, and dizziness in a person. A high level of carboxyhaemoglobin is proved to be fatal for humans.

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