Mass Transfer
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

Remains same
Either A or B; depends on the gas
Increases
Decreases

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

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