This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Extractive Distillation”.
1. Which distillation is used to separate azeotropes and close boiling mixtures?
a) Extractive distillation
b) Salt distillation
c) Pressure-swing distillation
d) Reactive distillation
View Answer
Explanation: Extractive distillation is used to separate azeotropes and close boiling mixtures.
2. If the feed is ______ boiling azeotrope the solvet enters the column with the feed.
a) Maximum
b) Minimum
c) Low
d) High
View Answer
Explanation: If the feed is maximum boiling azeotrope the solvet enters the column with the feed.
3. Why is water the preferred solvent for separating acetone and methanol?
a) Because it does not form hydrogen bonding
b) Because it does not react with it
c) Because water is an universal solvent
d) Because water does not form binary or ternary azeotropes with acetone or methanol.
View Answer
Explanation: Water is the preferred solvent for separating acetone and methanol because water does not form binary or ternary azeotropes with acetone or methanol.
4. What happens due to presence of appreciable water?
a) Phase activity coefficient of acetone increases and that of methanol decreases
b) Phase activity coefficient of acetone decreases and that of methanol increases
c) Phase activity coefficient of both methanol and acetone increases
d) Phase activity coefficient of both decreases
View Answer
Explanation: Phase activity coefficient of acetone increases and that of methanol decreases due to presence of appreciable water.
5. What is the distillate and bottom in presence of appreciable water?
a) Distillate of methanol and bottoms of acetone
b) Distillate of acetone and bottoms of methanol
c) Distillate of both acetone and methanol
d) Bottoms of both acetone and methanol
View Answer
Explanation: Due to presence of appreciable water, we get a distillate of acetone and bottoms of methanol.
6. What is the unfortunate point of extractive distillation?
a) Water has low boiling point
b) Water has high boiling point
c) Extractive distillation is costly
d) Extractive distillation is not efficient
View Answer
Explanation: Water having a low boiling point is an unfortunate aspect of extractive distillation. Aniline is used instead.
7. Which factor does not decide a solvent?
a) Availability
b) Cost
c) Corrosivity
d) Viscosity
View Answer
Explanation: Viscosity of solvent won’t decide which solvent to be chosen.
8. Solvent should not form ________
a) Hydrogen bond
b) London forces
c) Azeotrope
d) Mixture
View Answer
Explanation: A solvent that forms a azeotrope is not used.
9. All the successful solvents are ________liquids.
a) Azeotrope forming
b) Hydrogen bonding
c) Reactive
d) Highly viscous
View Answer
Explanation: All the successful solvents are hydrogen bonding liquids since a successful solvent should not form azeotrope.
10. It is ________ to find a solvent to separate same functional group.
a) Easy
b) Difficult
c) Impossible
d) Illogical
View Answer
Explanation: It is impossible to find a solvent to separate same functional group.
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