Mass Transfer
In extractive distillation, solvent is

Present in overhead stream
Added to alter the relative volatility of the mixture
Of high viscosity to give high tray efficiency
Of high volatility

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Mass Transfer
The term "cooling range" in a cooling tower refers to the difference in the temperature of

Hot water entering the tower and the wet bulb temperature of the surrounding air
Cold water leaving the tower and the wet bulb temperature of the surrounding air
None of the listed here
Hot water entering the tower and the cooled water leaving the tower

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