Engineering Questions with Answers - Multiple Choice Questions
Separation Processes MCQ’s – Extraction of Bioproducts
1 - Question
Which of the following is not a commonly used solvent?
a) Acetone
b) Hexane
c) Iso-butyl keton
d) Acetaldehyde
View Answer
Explanation: Acetaldehyde is not a commonly used solvent.
2 - Question
The cost of solvent extraction is how many times more than distillation?
a) 20
b) 30
c) 50
d) 60
View Answer
Explanation: The cost of solvent extraction is 60 times more than distillation.
3 - Question
How can the partition coefficient be increased?
a) By increasing the feed
b) By decreasing the feed
c) By changing pH
d) By increasing chemical potential
View Answer
Explanation: By changing the pH the chemical potential can be reduced hence the partition coefficient can be increased.
4 - Question
Because partition coefficients of some solvents are unfavorably low _______ has received much attention.
a) Extractive reaction
b) Reactive extraction
c) Distillation
d) Fractional distillation
View Answer
Explanation: Because partition coefficients of some solvents are unfavorably low reactive extraction has received much attention.
5 - Question
What can be used to enhance the extraction of polar zwitter ions?
a) Hydrogen bonding
b) Acid-base pairing
c) Formation of ion pair
d) Addition of surfactant
View Answer
Explanation: High hydrogen bonding will lead to high extraction of polar zwitter ions.
6 - Question
How is the organic partitioning of a cation or an anion enhanced?
a) Hydrogen bonding
b) Acid-base pairing
c) Formation of ion pair
d) Addition of surfactant
View Answer
Explanation: The organic portioning of a cation or anion is dramatically enhanced by formation of ion pair between target species and complementary ion-pair agent.
7 - Question
How can competitive water and mineral salts be removed?
a) Hydrogen bonding
b) Acid-base pairing
c) Formation of ion pair
d) Addition of surfactant
View Answer
Explanation: Acid-base pairing permits the removal of competitive water that conatins mineral salts and minerals added to alter pH
8 - Question
What effect does increasing temperature have on KD?
a) Increases
b) Decreases
c) First increases then decreases
d) First decreases then increases
View Answer
Explanation: Increasing temperature decreases the kD value.
9 - Question
What happens after critical micelle concentration CMC?
a) Micelles stop forming
b) Micelles cannot form
c) Micelles start forming
d) Solubility is maximum
View Answer
Explanation: Above CMC micelles start forming.
10 - Question
How are reverse micelles formed?
a) By adding surfactant
b) By removing surfactant
c) By adding solvent
d) By removing solvent
View Answer
Explanation: By adding solvent above CMC< reverse micelles can be formed.