Engineering Questions with Answers - Multiple Choice Questions
Unit Processes MCQ’s – Completing Esterification
1 - Question
What effect does removal of water has on esterification?
a) Increase reaction
b) Decrease reacting
c) Completes reaction
d) Acts as catalyst
View Answer
Explanation: One way of completing an esterification is to remove the water as it is formed. The removal of the water is aided by bubbling an inert gas through the mixture or by the application of a vacuum.
2 - Question
What is a Glyceride?
a) Volatile acid
b) Non-volatile acid
c) Neutral
d) None of the mentioned
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Explanation: Glyceride is a non-volatile acid.
3 - Question
What are the ways to removes water from reaction?
a) Superheated steam
b) Bubbling inert gas
c) Heating
d) All of the mentioned
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Explanation: The removal of the water is aided by bubbling an inert gas through the mixture or by the application of a vacuum. When the acid, alcohol, and ester are non-volatile, the mixture is heated, usually to around 200°C or higher, without a catalyst to drive out the water. Another method of removing the water is to pass superheated steam through the mixture; the steam both agitates the mixture and carries off the water as it is formed.
4 - Question
How to complete a reaction when acids are volatile?
a) Superheated steam
b) Distillation
c) Catalyst
d) All of the mentioned
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Explanation: When either or both the acid and the alcohol are volatile, the reaction may be carried to completion by distilling out the water produced in the reaction, usually as an azeotrope.
5 - Question
What should be considered during azeotropic distillation?
a) Solubility
b) Boiling point
c) Both solubility and boiling point
d) None of the mentioned
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Explanation: The operating conditions must be adapted to the particular acid and alcohol. Not only must the boiling point of the azeotropes be considered but also the solubilities of the esters and alcohols in water.
6 - Question
Ethyl acetate is produced by the mixture of ethanol with what?
a) Acetic acid
b) Carboxylic acid
c) Ketones
d) Amides
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Explanation: Ethyl acetate can be made continuously by starting with a mixture of ethanol and acetic acid, with some sulfuric acid.
7 - Question
Ternary azeotrope can be easily separated by distillation.
a) True
b) False
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Explanation: The ternary azeotrope boils lower than any of the individual constituents of the system or either of the binary azeotropes and is the distillate from an efficient column as long as all three of the constituents are present in the still. Because this ternary azeotrope cannot be separated by distillation.
8 - Question
What happens to the rate of reaction as reflux ration increases?
a) Increases
b) Decreases
c) No change
d) None of the mentioned
View Answer
Explanation: As rate of reaction increases, reflux ratio also increases.