Mass Transfer
Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes?

Packed towers
Spray towers
Wetted wall columns
Plate towers

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

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

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