Mass Transfer
For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams

Decreases
Passes through a maximum
Increases
Remains unaffected

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Relative volatility is reasonably constant
Multicomponent distillation is involved
Mixture (to be separated) shows negative deviation from ideality
Mixture (to be separated) shows positive deviation from ideality

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