Mass Transfer
Can the efficiency of a plate in the distillation tower be greater than 100%?

Never
Yes
Normally not; but is possible if infinite number of plates are put
Yes ; if the reflux ratio is maximum

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

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

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