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.
Answer: Option C 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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