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

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

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Mass Transfer
In a counter-current liquid extractor

Both liquids flow at fixed rate
Both liquids can have any desired flow rate
Liquid's flow rate depends upon the temperature and pressure
Only one of the liquids may be pumped at any desired rate

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Mass Transfer
In case of an absorber, the operating

Velocity is more than the loading velocity
Line can be either above or below the equilibrium curve
Line always lies below the equilibrium curve
Line always lies above the equilibrium curve

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