Mass Transfer
Positive deviation from Raoult's law means a mixture whose total pressure is

Less than the sum of the vapour pressure of the components
Less than that computed for ideality
None of these
Greater than that computed for ideality

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

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

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