1. 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
Explanation: When a pressure greater than the osmotic pressure is applied in the reverse direction the solvent molecules reverses their path.
2. In which separation process is the heat of evaporation required?
a) Desublimation
b) Pervaporation
c) Crystallization
d) Reverse osmosis
Explanation: The species transported through non porous membranes are evaporated and used.Thus there is a requirement of heat of evaporation
3. Which of the following separation techniques DO NOT use a solid agent?
a) Adsorption
b) Ion-exchange
c) Chromatography
d) Stripping
Explanation: There is no requirement of a solid agent in the process of separation by stripping.
4. 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
Explanation: Components move through the bed at different rates when the solid adsorbent is used.
5. Demineralization of water is done by which process?
a) Adsorption
b) Chromatography
c) Ion-Exchange
d) Distillation
Explanation: Ion-exchange is used to remove salts and their corresponding charged metals to demineralize water.
6. What are the solid agents in form of?
a) Thick beds
b) Tubes
c) Flat sheets
d) Granular material
Explanation: Solid agents are in forms of granular material that increase the exposed surface area.
7. How is the separation of uranium isotopes carried out?
a) Centrifugation
b) Electrodialysis
c) Electrophoresis
d) Thermal diffusion
Explanation: Centrifugation helps separation of isotopes based on molecular weights.
8. How is the separation of chlorine isotopes carried out?
a) Centrifugation
b) Electrodialysis
c) Electrophoresis
d) Thermal diffusion
Explanation: Thermal diffusion helps in the separation of chlorine isotopes.
9. Which separation technique is used to concentrate heavy water?
a) Centrifugation
b) Electrodialysis
c) Electrolysis
d) Thermal diffusion
Explanation: Electrolysis is the technique used to concentrate heavy water.
10. Which separation technique is used for desalinization of sea water?
a) Centrifugation
b) Electrodialysis
c) Electrophoresis
d) Thermal diffusion
Explanation: Electrodialysis is used in desalinization of sea water.