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Ozone penetrates further into the lung than sulphur dioxide because it is

  • A.Much less soluble in water
  • B.A smaller molecule
  • C.Present at higher concentration
  • D.Denser than air

Answer: A

Solubility governs where a gas is absorbed, and a poorly soluble gas passes the upper airways to reach the small airways and alveoli. That is why ozone damage appears deep in the lung while sulphur dioxide acts higher up.

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