Mass Transfer
Flash distillation is suitable for separating the constituents of a binary system, which

Form minimum boiling azeotrope
Have very close boiling points
Have very wide boiling points
Form constant boiling azeotrope

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Mass Transfer
Relative humidity is the ratio of the

Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
Actual humidity to saturation humidity
None of these
Partial pressure of the vapour to the vapour pressure of the liquid at room temperature

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