Mass Transfer
In azeotropic mixture, the equilibrium vapour composition is

None of the listed here
Same as liquid composition
Less than liquid composition
More than liquid composition

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

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
Cannot be computed

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