Mass Transfer
Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.

Film
None of the listed here
Penetration
Surface renewal

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Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

Composition of vapors and that of liquid do not vary throughout the column
The top and bottom compositions are unchanged with and without total reflux
Reboiler load and condenser load are minimum
The top and bottom compositions correspond to the maximum enrichment available

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