Mass Transfer
With increase in temperature, the rate of leaching increases, because the

Diffusivity of solute increases
Thermal conductivity of solute increases
Viscosity of solvent decreases
None of these

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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 exhibits an azeotrope at 101.3 kPa
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 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
In an operating distillation column, the

Vapors and liquids are at their dew point and bubble point respectively
Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column
Driving force for the liquid flow is its specific weight
Highest temperature is encountered at the top of the column

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