Mass Transfer
In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.

Gas
Liquid
Both A & B
Neither A nor B

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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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