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)

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

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Mass Transfer
A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?

The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and m-xylene 10
The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10
The mixture contain optical isomers
The mixture exhibits an azeotrope at 101.3 kPa

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Mass Transfer
The rate of solid-liquid extraction is limited by the

Diffusion of the solute through the solvent in the pores to the outside of the particle
All of these
Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
Phase change of the solute as it dissolves in the solvent

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