Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Total cost first decreases and then increases
Slope of the operating line in stripping section decreases
Number of plates decreases very slowly first and then more and more rapidly
Liquid flow increases while the vapor flow decreases for a system

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

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