A. Increases
B. Decreases
C. Remains unchanged
D. Depends on relative volatility
Related Mcqs:
- If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that___________________?
A. The system comprises of partially miscible liquids
B. The system comprises of miscible liquids
C. The system comprises of an azeotrope
D. On heating, a vapor phase will appear; while on cooling, a solid phase will appear - 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. - 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 - Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the ________________ temperature?
A. Dry-bulb
B. Wet-bulb
C. Dew point
D. Adiabatic saturation - Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?
A. Cost
B. Availability
C. Toxicity
D. Selectivity - In steam distillation, the _____________________?
A. Temperature is 100°C
B. Temperature is more than 100° C
C. Product must be immiscible with water
D. Temperature is higher than the boiling point of either component - Steam distillation is used to__________________?
A. Reduce the number of plates
B. Avoid thermal decomposition of a component
C. Increase the efficiency of separation
D. Increase the total pressure of distillation - Steam distillation is not recommended to be used, if the _____________________?
A. Azeotropic mixture is to be separated and the final product is miscible with water
B. Liquids decompose, if distilled directly at atmospheric pressure
C. Material cannot be distilled by indirect heating even under low pressure, because of the high
boiling temperature
D. Material to be distilled is thermally unstable or has the tendency to react with other
components associated with it, at the boiling temperature - 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. - 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
