Mass Transfer
In a counter-current extractor, as the axial mixing increases, the extraction efficiency

Decreases
Remains unchanged
Depends on the pressure of the system
Increases

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Mass Transfer
Bollman extractor

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

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Mass Transfer
For absorbing a sparingly soluble gas in a liquid

Liquid side mass transfer co-efficient should be decreased
Gas side mass transfer co-efficient should be increased
Liquid side mass transfer co-efficient should be increased
Mass transfer co-efficient must be kept constant

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