Question

Assertion (A) High carbon monoxide $(CO) $ levels can kill a person.
Reason (R) $CO$ has greater affinity for haemoglobin.

• A. If both A and R are true and R is the correct explanation of A
• B. If both A and R are true, but R is not the correct explanation of A
• C. If A is true, but R is false
• D. If A is false, but R is true

Answer 1

Answer: (A)

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Carbon monoxide combines with haemoglobin far readily as compared to oxygen, since, it has $200$ times greater affinity for Hb. As a result, carboxyhaemoglobin is formed which causes reduced transport of $O _{2}$ in body. As a result, nausea, suffocation and even death occurs.