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

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Mixture (to be separated) shows positive deviation from ideality
Multicomponent distillation is involved
Relative volatility is reasonably constant
Mixture (to be separated) shows negative deviation from ideality

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