A) \[C{{O}_{2}}(g)\]
B) \[{{O}_{2}}(g)\]
C) \[CO\,(g)\]
D) \[{{N}_{2}}(g)\]
Correct Answer: C
Solution :
The respiratory pigment in blood is haemoglobin. It forms unstable compound oxyhaemoglobin with oxygen. But carbon monoxide is the asphyxiating agent. It combines with the haemoglobin of blood and form carboxyhaemoglobin. This reduces the haemoglobin available to carry oxygen to the body. Carbon monoxide combines with the haemoglobin of blood about 210 times faster than oxygen does and result in oxygen -deficiency. It produces giddiness and headache. At higher concentrations, it proves fatal. \[CO+haemoglobin\xrightarrow{{}}\]carboxyhaemoglobin
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