Mass Transfer
A minimum boiling azeotrope is exemplified by

Acetone-carbon disulphide
Toluene-benzene
None of these
Water-isobutyl alcohol

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Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Pressure drop in the equipment will be very high
Viscosity variation of the fluids may cause channeling/flooding
None of these

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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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

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

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