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Which of the following best explains why chemical absorption suits a sparingly soluble gas?

  • A.The reagent raises the gas's solubility
  • B.The reaction lowers the tower's pressure drop
  • C.Chemical absorption needs no liquid
  • D.Reacting it keeps the driving force high

Answer: D

A physical absorber would approach equilibrium and stall, whereas a reagent that consumes the dissolved gas keeps its concentration near zero. The cost is a consumed reagent and a pollutant that cannot be recovered unchanged.

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