This set of Engineering Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Desalination of Brackish Water”.
1. The example of brackish water is ___________
a) Ground water
b) Rain water
c) Sea water
d) Underground water
View Answer
Explanation: The example of brackish water is sea water. Ground water, underground water and rain water are not brackish water. Sea water is also saline in nature and not fit for domestic purpose.
2. Which of the following technique is not used for the desalination of brackish water?
a) Electrolysis
b) Electrodialysis
c) Reverse osmosis
d) Distillation
View Answer
Explanation: Electrolysis technique is not used for the desalination of brackish water. Electrodialysis, reverse osmosis and distillation are the few techniques used for desalination of brackish water.
3. Salt cannot be separated from brackish water by freezing.
a) True
b) False
View Answer
Explanation: Salt can be separated from brackish water by freezing.
4. Electrodialysis is based on the fact that the ions present in saline water migrate towards their respective electrodes under the influence of applied ___________
a) Current
b) Resistance
c) Conductance
d) EMF
View Answer
Explanation: Electrodialysis is based on the fact that the ions present in saline water migrate towards their respective electrodes under the influence of applied emf. The potential difference generated between the elctrodes is the main cause of flow of electrons.
5. The cation selective membrane is embedded with functional groups of ___________
a) Positive charge
b) Negative charge
c) Both positive as well as negative charge
d) Neutral
View Answer
Explanation: The cation selective membrane is embedded with functional groups of negative charge as it attracts only positive charges towards them.
6. In electrodialysis cell, the pressure is about ___________
a) 2 kg/m2
b) 3 kg/m2
c) 5-6 kg/m2
d) 10 kg/m2
View Answer
Explanation: Electrodialysis is an electrically driven separation conducted at very low pressure-driven of about 5-6 kg/m2.
7. Electrodialysis is an electrically driven separation conducted at a very low pressure-driven, size-exclusion filtering process.
a) True
b) False
View Answer
Explanation: Electrodialysis is an electrically driven separation conducted at a very low pressure-driven, size-exclusion filtering process. Electrodialysis is used to transport salt ions from one solution through ion-exchange membranes to another solution under the influence of an applied electric potential difference.
8. The ion-exchange membrane are electrically conductive and are not permeable to ___________ flow, even under pressure.
a) Electron
b) Oil
c) Fluorine
d) Water
View Answer
Explanation: The ion-exchange membrane are electrically conductive and impermeable to water flow, even under pressure. Electrons can easily flow through these membranes.
9. Select the incorrect statement from the following option.
a) Electrodialysis reversal (EDR) was introduced in the commercial sector to improve electrodialysis process
b) The EDR process and conventional ED unit operates on the same principle, except at intervals of several times an hour
c) The reversal feature is useful in breaking up films, scales and other deposits
d) Electrodialysis process is not economical as per capital cost
View Answer
Explanation: Electrodialysis process is economical as per capital cost and operational expenses are concerned. All the other options are correct.
10. Which one of the following is not a cation exchanger?
a) Amberlite
b) Triolite
c) Dowex
d) Duolite
View Answer
Explanation: Triolite is not a cation exchanger. Amberlite, dowex and duolite are some of the examples of the cation exchanger.
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