Mass Transfer
For contacting a highly soluble gas with a liquid

None of the listed here
Both of the options given here
Spray the liquid on gas stream
Bubble the gas through liquid

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Mass Transfer
Dew point of an air-water vapor mixture

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
At constant humidity & total pressure is fixed
All of the listed here

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Mixture (to be separated) shows negative deviation from ideality
Relative volatility is reasonably constant
Mixture (to be separated) shows positive deviation from ideality
Multicomponent distillation is involved

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