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

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

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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
Is computed from the intercept of the operating line
Is the optimum reflux ratio
Cannot be computed

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