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

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

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Mass Transfer
When the solvent dissolves very little of solute, then

Very small quantity of solvent is required
Solvent of low latent heat of vaporisation should be used
Large quantity of solvent is required to extract the solute
Solvent of low freezing point should be used

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