Mass Transfer
For contacting a highly soluble gas with a liquid

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

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Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Packing may be crushed due to thermal expansion/contraction of the components of the equipments
None of these
Viscosity variation of the fluids may cause channeling/flooding
Pressure drop in the equipment will be very high

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

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