Q32 / 180 · KCET 2023 · Chemistry

Which one of the following gases converts haemoglobin into carboxy haemoglobin?

  • Correct answer
    A
    $\mathrm{CO}$
  • B
    $\mathrm{O}_2$
  • C
    NO
  • D
    $\mathrm{CO}_2$

Solution

Carbon monoxide ( $\mathrm{CO}$ ) converts haemoglobin to carboxyhaemoglobin. When $\mathrm{CO}$ is inhaled, it binds with haemoglobin in red blood cells with a much higher affinity compared to oxygen. This binding forms carboxyhaemoglobin which prevents the normal binding of oxygen to. haemoglobin, leading to a decreased oxygen-carrying capacity of the blood.

Hence, the correct answer is option: 'A'.

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