Discussion
Assertion (A) : Carbon monoxide when inhaled causes death.
Reason (R) : Carbon monoxide combines with haemoglobin.
Answer: A
Correct answer: Both A and R are true and R is the correct explanation of A.
Carbon monoxide binds to haemoglobin about 200 times more readily than oxygen does, forming carboxyhaemoglobin, which cannot carry oxygen. The blood is therefore left unable to supply the tissues, which is why the gas is lethal. Both are true and R explains A.
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