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

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

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Mass Transfer
One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect

Neither the product composition nor the fraction vaporised
The product composition but not the fraction vaporised
The fraction vaporised but not the product composition
The product composition as well as the fraction vaporised

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Mass Transfer
An example of elutioh is

Dissolution of tannin out of tree barks by water
Recovery of vegetable oils from seeds
Separation of sugar from sugar beet by hot water
Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank

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