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MHT CET Medical202624 April 2026Morning ShiftChemistryBiomoleculesActual

O ₂ gas has very low solubility in water. However, its solubility in blood is excessively high. This is because of

Options

  1. Awater is less viscous than blood
  2. Bblood is colloidal mixture
  3. Cbinding of O ₂ molecule to hemoglobin in blood.
  4. Dblood has low pressure

Correct answer

C. binding of O ₂ molecule to hemoglobin in blood.

Step-by-step solution

Oxygen is a non-polar molecule, so it has very low solubility in polar solvents like water. In blood, oxygen binds reversibly with the iron-containing protein hemoglobin present in red blood cells to form oxyhemoglobin. This chemical binding significantly increases the oxygen-carrying capacity of blood compared to simple physical dissolution in water. Answer: binding of O ₂ molecule to hemoglobin in blood.

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