Mass Transfer
Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature.

Less than
Equal to
More than
Either A or B; depends on the solid

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Mass Transfer
In a counter-current liquid extractor

Only one of the liquids may be pumped at any desired rate
Both liquids flow at fixed rate
Both liquids can have any desired flow rate
Liquid's flow rate depends upon the temperature and pressure

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Mass Transfer
An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)

Composition of the residue remains unchanged
More number of trays are required but the residue composition remains unchanged
Less number of trays are required
More number of trays are required and the residue composition is more dilute in methanol

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