Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Perforated tray tower
Grid tray tower
Wetted wall tower
Bubble cap tower

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Mass Transfer
Inside the distillation column, the

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

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