Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

All of these
Helps in increasing the settling rate of the bubbles
Comprises of thin bed of substances of extended surface having high porosity
Helps in increasing the bubble size entering the settler

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Mass Transfer
Inside the distillation column, the

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
None of these

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