question_answer

The toxic effect of CO is due to its affinity with haemoglobin as compared to oxygen, approximately by :

A)  20 times                                             

B)  200 times

C)  500 times                           

D)  10 times

Correct Answer: B

Solution :

 CO has 200 times more affinity for haemoglobin as compared to. CO reacts with Hb to form a stable compound carboxyhaemoglobin (CO Hb). So, it impairs oxygen transport resulting in asphyxia (difficulty in respiration), headache etc.