Mass Transfer
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

Perforated tray
Bubble cap
Packed
Wetted wall

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Mass Transfer
Bollman extractor

Is used for extraction of oil from oilseed
Is a centrifugal extractor
Is a static bed leaching equipment
Employs only counter-current extraction

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