Question

Which of the following gases mixes with the blood and prevents it from carrying oxygen?

• A. Carbon monoxide
• B. Carbon dioxide
• C. Nitrogen oxide
• D. Nitrogen trioxide

Answer 1

The correct option is A Carbon monoxide

The hemoglobin have more affinity towards the carbon monoxide rather than the oxygen. When the air is inhaled and there is presence of carbon monoxide, the hemoglobin protein binds to the carbon monoxide. This results in the formation of complex called as carboxyhemoglobin. This is the condition in which there is reduction in the supply of oxygen to the tissues which might lead to death.

Thus, the correct answer is option A.