A) it decreases \[C{{O}_{2}}\] concentration
B) it competes \[{{O}_{2}}\] to combine with haemoglobin
C) it is carcinogenic
D) it depletes \[{{O}_{3}}\] layer
Correct Answer: B
Solution :
Haemoglobin forms a stable compound with \[CO\]. The affinity of haemoglobin for \[CO\] is 200 times more than for \[{{O}_{2}}\] so even 0.1% \[CO\] blocks 50% haemoglobin of the body due to which oxygen 0carrying capacity of blood is decreased. This is called hypoxia.
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