This set of Applied Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Types of Fuel Cells”.
1. In standard hydrogen electrode, concentration of hydrogen is ____________
a) 0M
b) 0.5M
c) 1M
d) 1.5M
View Answer
Explanation: In standard hydrogen electrode, the concentration of hydrogen is 1 molar and the pressure is about 1atm.
2. The temperature maintained in the standard hydrogen electrode is _____________
a) 22oC
b) 23oC
c) 24oC
d) 25oC
View Answer
Explanation: The temperature maintained in the standard hydrogen electrode is 25oC, pressure is maintained at 1 atmosphere.
3. The emf of the standard hydrogen electrode is ____________
a) 0V
b) 1V
c) 2V
d) 3V
View Answer
Explanation: The electro motive force of the standard hydrogen electrode is 0V. Depending on the half cell attached, hydrogen cell acts as anode or cathode.
4. Which of the following is the correct equation?
a) E = Eo [(2.303RT)/nF] log10 [H+]
b) E = Eo + [(2.303RT)/nF] log10 [H+]
c) E = Eo – [(2.303RT)/nF] log10 [H+]
d) E = Eo/[(2.303RT)/nF] log10 [H+]
View Answer
Explanation: E = Eo – [(2.303RT)/nF] log10 [H+] is called Nernst equation. Where, E = single electrode potential, Eo = standard electrode potential, n = valency of ion, F = faraday.
5. If the standard hydrogen electrode is used as the reduction electrode, then the emf is given by __________
a) Ered = -Eo + (5/n) log10 [H+]
b) Ered = -Eo – (0.0591/n) log10 [H+]
c) Ered = Eo + (0.0591/n) log10 [H+]
d) Ered = -Eo + (0.0591/n) log10 [H+]
View Answer
Explanation: If the standard hydrogen electrode is used as the reduction electrode, then the emf can be given by Ered = -Eo + (0.0591/n) log10 [H+] that is Ered = – EOX.
6. In standard calomel electrode, for saturated KCL solution, electrode potential is __________
a) 0.897V
b) 0.456V
c) 0.3512V
d) 0.2415V
View Answer
Explanation: In standard calomel electrode, for saturated KCL solution, electrode potential is 0.2415V. The mercury of high purity is placed at the bottom of this tube.
7. For 1N KCL standard reduction potential in the calomel electrode is __________
a) 0.28V
b) 0.25V
c) 0.5V
d) 1V
View Answer
Explanation: For 1N KCL standard reduction in the calomel electrode is 0.28V. For 0.1N KCL solution the reduction potential is 0.3338V.
8. The calomel electrode is only used as _________
a) Oxidising electrode
b) Reducing electrode
c) Depends on the half cell
d) Cannot be said
View Answer
Explanation: The calomel electrode is used only as a reducing electrode. The electrolyte used is a solution of potassium chloride.
9. ___________ is the device used to measure the emf of the cell.
a) Voltmeter
b) Potentiometer
c) Ammeter
d) Multimeter
View Answer
Explanation: The potentiometer is the device used to measure the electro motive force of the cell. Ammeter is used to measure the quantity of current.
10. The emf of the Weston standard cell is __________ at 20oC.
a) 16.7989V
b) 5.2572V
c) 1.0183V
d) 0V
View Answer
Explanation: The electro motive force of the Weston standard cell is 1.0183V at 20oC and It varies slightly by 0.0000406V per change of 1oC.
11. In primary cells reaction is not reversible.
a) True
b) False
View Answer
Explanation: In primary cells, the reaction is not reversible and in secondary cells, the reaction can be reversed.
12. The energy of the fuel cells ___________
a) Can be recharged
b) Cannot be recharged
c) Is stored
d) Cannot be said
View Answer
Explanation: The energy of the fuel cells is stored. Energy can be withdrawn indefinitely as long as outside supply of fuel is maintained.
Sanfoundry Global Education & Learning Series – Applied Chemistry.
To practice all areas of Applied Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.
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