Mass Transfer
The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called

Percolation
None of these
Elutriation or elution
Decoction

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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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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
Composition of vapors and that of liquid do not vary throughout the column
Reboiler load and condenser load are minimum

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