This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “separations by Solid Agents and Barriers”.
1. What is the semi-permeable membrane used in separation techniques made from?
a) Animal calls
b) Plant cells
c) Egg shells
d) Natural fibers
View Answer
Explanation: Natural fibers act best as semi-permeable membrane.
2. What is separation effected by in microporous membranes?
a) Difference in solubility
b) Rate of species diffusion through the pores
c) Amount of feed to the membranes
d) Number of membranes used
View Answer
Explanation: Rate of species diffusion through the pores.
3. What is separation effected by in non-porous membranes?
a) Differences In solubility in the membrane
b) Rate of species diffusion through the pores
c) Amount of feed to the membranes
d) Number of membranes used
View Answer
Explanation: The differences in solubility lead to the separation in case of non-porous membranes.
4. What is meant by osmosis?
a) A process where molecules of a solute travel from more concentrated solution to less concentrated solution
b) A process where molecules of solute travel from less concentrated solution to more concentrated solution
c) A process where molecules of solvent travel from less concentrated solution to more concentrated solution through a semi-permeable membrane
d) A process where molecules of solvent travel from more concentrated solution to less concentrated solution through a semi-permeable membrane
View Answer
Explanation: The solvent travels from less concentration to more concentration thus equalizing the ncentration.This process is called as osmosis.
5. Why do reverse osmosis occur?
a) Because the concentration is more in the other region
b) Because the semi-permeable membrane has a tendency
c) Because solute molecules start travelling from high concentration to low concentration
d) Because a reverse pressure greater than the osmotic pressure is applied
View Answer
Explanation: When a pressure greater than the osmotic pressure is applied in the reverse direction the solvent molecules reverses their path.
6. In which separation process is the heat of evaporation required?
a) Desublimation
b) Pervaporation
c) Crystallization
d) Reverse osmosis
View Answer
Explanation: The species transported through non porous membranes are evaporated and used.Thus there is a requirement of heat of evaporation.
7. Which of the following separation techniques DO NOT use a solid agent?
a) Adsorption
b) Ion-exchange
c) Chromatography
d) Stripping
View Answer
Explanation: There is no requirement of a solid agent in the process of separation by stripping.
8. Why is a solid adsorbent used in the separation technique of adsorption?
a) Because the components selectively adsorb and desorb from the solid surfaces
b) Because the transportation of solid adsorbents is easy
c) There are no known liquid adsorbents
d) Using a solid adsorbent lessens the heat of evaporation
View Answer
Explanation: Components move through the bed at different rates when the solid adsorbent is used.
9. Demineralization of water is done by which process?
a) Adsorption
b) Chromatography
c) Ion-Exchange
d) Distillation
View Answer
Explanation: Ion-exchange is used to remove salts and their corresponding charged metals to demineralize water.
10. What are the solid agents in form of?
a) Thick beds
b) Tubes
c) Flat sheets
d) Granular material
View Answer
Explanation: Solid agents are in forms of granular material that increase the exposed surface area.
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