Mass Transfer
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler

Remains unaffected
Decreases
Increases
And the heat required in reboiler decreases

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Mass Transfer
In a counter-current liquid extractor

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

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Mass Transfer
For water-ethanol system, the minimum reflux ratio

Cannot be computed
Is the optimum reflux ratio
Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
Is computed from the intercept of the operating line

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