Mass Transfer
The caking of crystals can be prevented by

Maintaining low critical humidity
Both A and C
Maintaining high critical humidity
Coating the product with inert material

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

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