Mass Transfer
Pick out the wrong statement. Raoult's law does not apply, when the

Size of component molecules are not equal
Attractive forces between like and unlike molecules in the solution are approximately equal
Chemical combination or molecular association between unlike molecules takes place in the formation of solution
Component molecules are nonpolar

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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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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,

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

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