Mass Transfer
Mass transfer co-efficient is defined as

None of the listed here
Flux = Co-efficient/concentration difference
Flux=concentration difference/co-effi-cient
Co-efficient = Flux/concentration difference

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

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