Mass Transfer
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for

All of these
Constant relative volatility
Constant molal overflow
Total reflux

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

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