Mass Transfer
Molecular distillation is

For heat-sensitive materials
Very low pressure distillation
High temperature distillation
Both B and 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
Relative volatility is reasonably constant
Mixture (to be separated) shows positive deviation from ideality

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Liquid flow increases while the vapor flow decreases for a system
Slope of the operating line in stripping section decreases
Number of plates decreases very slowly first and then more and more rapidly
Total cost first decreases and then increases

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