Related Questions

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
Entrainer used in azeotropic distillation should
A Form a low boiling azeotrope with one of the constituents of the mixture
B Form a new azeotrope of low relative volatility with one of the constituents of the mixture
C Have high latent heat of vaporisation
D Have high viscosity to provide high tray efficiency
A contractor employed 30 men to do a piece of work in 38 days. After 25 days , he employed 5 men more and the work was finished one day earlier. How many days he would have been behind, if he had not employed additional men?
A 1
B 114
C 134
D 112
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
Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).
A 5-10
B 30-80
C 150-250
D 350-400
Steam distillation is used to separate
A Azeotropes
B High boiling substances from nonvolatile impurities
C Heat sensitive materials
D Mixtures of low relative volatility
The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is
A 3
B 1
C 2
D 0
The equilibrium liquid composition compared to the vapor composition in case of azeotropic mixture is
A More
B Less
C Same
D Either more or less; depends on the system
The relative volatility of a binary mixture at the azeotropic composition is
A 1
B > 1
C 0
D ∞
A binary liquid azeotropic mixture has boiling point higher than either of the components, when it shows __________ deviation from Raoult's Law.
A Positive
B Negative
C No
D None of these

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