📊 Mass Transfer
Q. In an operating distillation column, the
  • (A) Vapors and liquids are at their dew point and bubble point respectively
  • (B) Driving force for the liquid flow is its specific weight
  • (C) Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column
  • (D) Highest temperature is encountered at the top of the column
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✅ Correct Answer: (C) Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column

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