Multiple choice

Carbon monoxide, a highly poisonous gas, reacts with blood to form

  1. oxy-haemoglobin

  2. carboxyhaemoglobin

  3. nitro-haemoglobin

  4. carbon dioxide haemoglobin
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon monoxide binds to hemoglobin in red blood cells to form carboxyhaemoglobin, which is extremely stable (200+ times stronger bond than oxyhemoglobin). This prevents oxygen transport, causing CO poisoning. CO does not form nitro-haemoglobin, carbon dioxide haemoglobin, or oxy-haemoglobin.

Keep practicing — related questions