Mass Transfer
In batch distillation with constant reflux, overhead product composition __________ with time.

May increase on decrease, depends on the system
Does not vary
Decreases
Increases

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Mass Transfer
In steam distillation, the

Temperature is more than 100° C
Temperature is higher than the boiling point of either component
Product must be immiscible with water
Temperature is 100°C

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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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