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Chemical absorption is preferred to physical absorption when

  • A.The gas is extremely soluble already
  • B.No liquid is available
  • C.The gas is to be recovered unchanged
  • D.The gas is sparingly soluble

Answer: D

Reacting the dissolved gas keeps its concentration in the liquid near zero and so maintains the driving force through the whole tower. The penalty is that the reagent is consumed and the pollutant is no longer recoverable in its original form.

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