Mass Transfer
When a multistage tray tower uses a minimum reflux ratio, it implies

Minimum trays and minimum reboiler heat load
Infinite trays and maximum reboiler heat load
Minimum trays and maximum reboiler heat load
Infinite trays and minimum reboiler heat load

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Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Only liquid phase obeys Dalton's law
Only vapor phase follows Raoult's law
Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law

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