Mass Transfer
Stacked packing compared to dumped packing

Provides poorer contact between the fluids
Gives higher pressure drop
Gives lower pressure drop
Both A & B

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

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

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