A. At < 100
B. At > 210.6
C. Between 100 and 210
D. None of these
Related Mcqs:
- 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 - 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 - Pick out the system with minimum boiling azeotrope at 1 atm ?
A. Benzene-toluene
B. Ethyl alcohol-water
C. Hydrochloric acid-water
D. All A., B. and C. - If a1 and a2 are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement ?
A. a1 = a2
B. a1 = 2a2
C. a1 = 0.5 a2
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 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 - The boiling points of pure components of a binary system ________________ with increase in total pressure of the system ?
A. Decreases
B. Increases
C. Remains unchanged
D. May increase or decrease, depends on the system - At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes_____________________?
A. 1
B. 0
C. ∞
D. None of these
