Mass Transfer
In physical terms, Schmidt number means

Thermal diffusivity/mass diffusivity
Thermal diffusivity/momentum diffusivity
Mass diffusivity/thermal diffusivity
Momentum diffusivity/mass diffusivity

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Mass Transfer
When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,

As the acetone concentration increases, the solubility curves approach each other
The distribution curve which is a plot between x (acetone concentration in one phase) and y (acetone concentration in other phase) is analogous to x-y curve used in distillation and absorption termina
All of these
Both the phases become identical at a particular common point on both the solubility curves called the plait point

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Mass Transfer
Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m² and the solvent flow, rate is 400 moles of S/m². hr. The equilibrium data is represented by Y = 3X² , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is

0.9
0.5
0.25
0.7

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Mass Transfer
In a counter-current liquid extractor

Both liquids can have any desired flow rate
Liquid's flow rate depends upon the temperature and pressure
Both liquids flow at fixed rate
Only one of the liquids may be pumped at any desired rate

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