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
Number of plates decreases very slowly first and then more and more rapidly
Slope of the operating line in stripping section decreases
Total cost first decreases and then increases

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Mass Transfer
Which of the following processes is not an example of adsorption applied to gaseous separations?

Recovery of valuable solvent vapors from dilute mixture with air and other gases
Dehumidification of air and gas
Removal of objectionable odour and impurities from industrial gases
Decolouration of yellow glycerene

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