Mass Transfer
For a distillation column operating at minimum reflux, the

None of these
Concentration of liquid and vapour leaving a plate will be same
Reflux ratio will be maximum
Number of plates required will be maximum

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Mass Transfer
Dew point of an air-water vapor mixture

All of the listed here
At constant humidity & total pressure is fixed
Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve
Decreases with decrease in pressure

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