Mass Transfer
When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.

Same as
Always lower than
Always higher than
Dependent on the system; can be either lower or higher than

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

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