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

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

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Mixture (to be separated) shows positive deviation from ideality
Mixture (to be separated) shows negative deviation from ideality
Relative volatility is reasonably constant
Multicomponent distillation is involved

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