Mass Transfer
To get high tray efficiency

Gas velocity should be very low
Interfacial surface between liquid and gas phase should be large
Time of contact between the two phases should be less
Liquid entrainment should be severe

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Mass Transfer
Inside the distillation column, the

None of these
Driving force for the vapour flow is the pressure drop
Pressure increases gradually from bottom to the top of the column
Liquids are not always at their bubble points

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