Mass Transfer
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

Unidirectional diffusion from gas to liquid phase
A counter diffusion at an almost equal molar rate
Either A or B
Unidirectional diffusion from liquid to gas phase

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Mass Transfer
Bollman extractor

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

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