Mass Transfer
Steam distillation is used for separation of high boiling

Both of the options given here
none of the listed here
Substances from non-volatile impurities
Volatile impurity from still higher boiling substances

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

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