Mass Transfer
Flash distillation is suitable for the separation of components

Having very close boiling points
Which form maximum boiling azeotrope
Which form minimum boiling azeotrope
Having very wide boiling points

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Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering and the cooled water leaving the cooling tower
Hot water entering the tower and the wet bulb temperature of the surrounding air
None of these

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

One of the liquid components is heat sensitive
One of the liquid components has very high affinity towards the solvent
Extracting solvent is cheaply & abundantly available
Viscosity of liquid components is very high

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