A. Thermal diffusion
B. Reverse osmosis
C. Adsorption
D. Absorption
Related Mcqs:
- When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is _______________ distillation?
A. Continuous
B. Steam
C. Azeotropic
D. None of these - At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?
A. 0.0
B. 0.2
C. 0.4
D. 1.0 - _____________ is used as an ‘entrainer’ for the separation of acetic acid-water mixture by distillation?
A. Furfural
B. Benzol
C. Butyl acetate
D. Hexane - An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively. The humidity of air sample expressed as kg of water vapour/kg of dry air is__________________?
A. 0.048
B. 0.079
C. 0.122
D. 0.152 - Separation of two volatile liquids by distillation makes use of their___________________?
A. Selectivity
B. Relative volatility
C. Solubility
D. Density difference - Separation of two volatile liquids by distillation makes use of their________________________?
A. Selectivity
B. Relative volatility
C. Solubility
D. Density difference - Out of two equilibrium curves, first one lies above the diagonal and the second lies below the diagonal in the x-y plot. It means that separation by distillation is_________________?
A. Not possible in the second case unless vacuum is applied
B. Not possible in the second case unless high pressure is applied
C. More readily done in the second case compared to first one
D. None of these - Steam distillation is used for separation of high boiling ____________________?
A. Substances from non-volatile impurities
B. Volatile impurity from still higher boiling substances
C. Both A. and B.
D. Neither A. nor B. - The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will______________________?
A. Increase
B. Decrease
C. Remain same
D. Depend on saturated boiling point; may increase or decrease - Separation of two or more components of a liquid solution cannot be achieved by___________________?
A. Fractional crystallisation
B. Liquid extraction
C. Absorption
D. Evaporation