Mass Transfer
As the reflux ratio increases, the slope of the operating line for rectifying section

Data insufficient, cannot be predicted
Increases
Decreases
Remains constant

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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 positive deviation from ideality
Mixture (to be separated) shows negative deviation from ideality

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