Mass Transfer
In extractive distillation, solvent is

Of high viscosity to give high tray efficiency
Present in overhead stream
Added to alter the relative volatility of the mixture
Of high volatility

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Mass Transfer
In case of an absorber, the operating

Velocity is more than the loading velocity
Line always lies below the equilibrium curve
Line always lies above the equilibrium curve
Line can be either above or below the equilibrium curve

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