Mass Transfer
In extractive distillation, solvent is

Present in overhead stream
Of high viscosity to give high tray efficiency
Of high volatility
Added to alter the relative volatility of the mixture

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

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