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Class 12 Chemistry: Electrochemistry
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MCQs on electrochemical cells, galvanic cells, nernst equation, electrolytic cells and solutions, electrolysis, batteries, fuel cells and corrosion.
 

Class 12 Chemistry: Electrochemistry
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25 Questions

1. The standard oxidation potential of Ni/Ni2+ electrode is 0.3 V. If this is combined with a hydrogen electrode in acid solution, at what pH of the solution with the measured e.m.f. be zero at 25°C? (Assume [Ni2+] = 1M)
2. Which of the following is not a generally used electrolyte in the salt bridges used to connect the two half-cells of an electrochemical cell?
3. Which of the following factors does not affect the electrode potential of an electrode?
4. What is the standard reduction potential of the cathode of a galvanic cell if the standard EMF of the cell and the standard reduction potential of the anode are 2.71 and -2.37 respectively?
5. Which of the following solutions cannot conduct electricity?
6. Which of the following is not a characteristic feature of a salt bridge?
7. Who invented the galvanic cell?
8. What is the role of manganese dioxide in a dry cell?
9. What is the preferred electrode when it is not allowed to take part in the chemical reaction?
10. Which of the following conditions are satisfied when the cell reaction in the electrochemical cell is spontaneous?
11. A zinc rod dipped in n molar solution of ZnSO4 has an electrode potential of -0.56 V. The salt is 98 percent dissociated at room temperature. What is the molarity of the solution? (E°(Zn+2/Zn) = -0.5 V)
12. A cell is prepared by dipping a copper rod in 1 M CuSO4 solution and an iron rod in 2 M FeSO4 solution. What are the cathode and anode respectively?
13. Which of the following is not a fuel cell?
14. Which of the following is the overall reaction of rusting?
15. What is the direction of flow of electrons in an electrolytic cell?
16. What is the final oxidation state of manganese after the electrochemical reactions in a dry cell?
17. What is the composition of aqua regia?
18. The e.m.f and the standard e.m.f of a cell in the following reaction is 5 V and 5.06 V at room temperature, Ni(s) + 2Ag+(n) → Ni2+(0.02M) + 2Ag(s). What is the concentration of Ag+ ions?
19. Why do leak proof dry cells have an iron or steel sheet covering the zinc cylinder?
20. Which of the following statements is correct with respect to electrolytic solutions?
21. Which of the following statements is false?
22. Which of the following is a correct method to calculate the EMF of a galvanic cell?
23. Calculate the electrode potential of the given electrode.
Pt, Cl2(2 bar)| 2Cl–(0.02 M); E°(Cl2 | 2Cl–) = 3.4 V
24. Which of the following is a not a secondary cell?
25. Which of the following is not a requirement for a useful battery?

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