Mass Transfer
Which of the following same diameter columns gives lowest pressure drop per unit height?

Packed column (stacked)
Bubble-cap column
Sieve-plate column
Randomly packed column

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

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

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