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

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

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Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Decreases pressure drop, decreases surface area
Decreases pressure drop, increases surface area
Increases pressure drop, increases surface area
Increases pressure drop, decreases surface area

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