A. Substances from non-volatile impurities
B. Volatile impurity from still higher boiling substances
C. Both A. and B.
D. Neither A. nor B.
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 - An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii) ____________________?
A. Less number of trays are required
B. Composition of the residue remains unchanged
C. More number of trays are required but the residue composition remains unchanged
D. More number of trays are required and the residue composition is more dilute in methanol - The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by __________________?
A. Raising the temperature
B. Lowering the total pressure
C. Both A. and B.
D. Neither A. nor B. - If the amount of the steam used in steam distillation is increased, the temperature of distillation__________________?
A. Increases
B. Decreases
C. Remains unchanged
D. Depends on relative volatility - In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because_______________?
A. Temperature is less
B. Total pressure is less
C. Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium
condition
D. Saturated steam is used for steam distillation - 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 - Flash distillation is suitable for the separation of components_________________?
A. Having very close boiling points
B. Which form maximum boiling azeotrope
C. Having very wide boiling points
D. Which form minimum boiling azeotrope - _____________ is used as an ‘entrainer’ for the separation of acetic acid-water mixture by distillation?
A. Furfural
B. Benzol
C. Butyl acetate
D. Hexane - The-relative volatility for separation of a non-ideal binary mixture by distillation should be ___________________?
A. 0
B. 1
C. > 1
D. < 1
