Mass Transfer
In which of the following unit operations, the selectivity is an important parameter?

Absorption
None of these
Solvent extraction
Distillation

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Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Decreases pressure drop, decreases surface area
Increases pressure drop, increases surface area
Decreases pressure drop, increases surface area
Increases pressure drop, decreases surface area

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