This set of Unit Processes Multiple Choice Questions & Answers (MCQs) focuses on “Completing esterification”.
1. 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. What is a Glyceride?
a) Volatile acid
b) Non-volatile acid
c) Neutral
d) None of the mentioned
View Answer
Explanation: Glyceride is a non-volatile acid.
3. What are the ways to removes water from reaction?
a) Superheated steam
b) Bubbling inert gas
c) Heating
d) All of the mentioned
View Answer
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. How to complete a reaction when acids are volatile?
a) Superheated steam
b) Distillation
c) Catalyst
d) All of the mentioned
View Answer
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. What should be considered during azeotropic distillation?
a) Solubility
b) Boiling point
c) Both solubility and boiling point
d) None of the mentioned
View Answer
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. Ethyl acetate is produced by the mixture of ethanol with what?
a) Acetic acid
b) Carboxylic acid
c) Ketones
d) Amides
View Answer
Explanation: Ethyl acetate can be made continuously by starting with a mixture of ethanol and acetic acid, with some sulfuric acid.
7. Ternary azeotrope can be easily separated by distillation.
a) True
b) False
View Answer
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. 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.
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