Mass Transfer
Which of the following is the most suitable for extraction in a system having very low density difference?

Centrifugal extractor
Mixer-settler extractor
Packed extraction tower
Pulsed extractor

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Mass Transfer
Inside the distillation column, the

Liquids are not always at their bubble points
None of these
Pressure increases gradually from bottom to the top of the column
Driving force for the vapour flow is the pressure drop

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