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Absorption removes a gaseous pollutant by

  • A.Dissolving it into a liquid
  • B.Binding it to the surface of a solid
  • C.Oxidising it to carbon dioxide and water
  • D.Cooling it until it condenses

Answer: A

The gas must be soluble in the chosen liquid, and the driving force is the difference between the partial pressure in the gas and the equilibrium pressure over the liquid. Packed and plate towers both exist to maximise the area over which that transfer takes place.

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