Which gas combines with haemoglobin of blood to form carboxyhaemoglobin?

A $SO X_{2}$
B $CO$
C $NO X_{2}$
D $CO X_{2}$

Answer: B

Carbon monoxide binds the iron of haemoglobin much more strongly than oxygen does, forming carboxyhaemoglobin. This reduces the oxygen carrying capacity of blood. The gas is

CO

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