A) non-availability of oxygen
B) Hb has more affinity to combine with carbon monoxide
C) Hb has more affinity to combine with nitrogen
D) combined effect of [a] and [b].
Correct Answer: D
Solution :
: Charcoal contains carbon, which on burning produces carbon monoxide (CO). CO has 200 times more affinity for haemoglobin than oxygen. It combines with haemoglobin and produces a stable compound carboxyhaemoglobin. Because of this compound haemoglobin becomes unable to carry sufficient oxygen from lungs to the brain and other body parts. Due to lack of oxygen, the person cannot breath properly. It causes suffocation. If CO is inhaled for a long time the person becomes unconscious and can even die due to oxygen starvation.
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