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Chapter 10
Electrochemistry
1. Reduction always takes place:
- At anode
- At cathode
- At both electrodes
- does not occur at electrodes
2. The electrolyte KOH is used in cell:
- Lead accumulator All Past P
- e Ni-Cd cell
- Alkaline battery
- Silver oxide battery
3. In the reaction 2Fe + 3Cl2_ 2FeCl3:
- Fe is reduced
- Fe is oxidized
- Cl2 is oxidized
- None of these happens
4. Oxidation state of hydrogen in CaH2 is:
- +1
- -1
- +2
- zero
5. Cu metal can be purified in electrolytic cell by making the impure Cu as:
- Anode
- Cathode
- Anode and Cathode
- Depends upon nature of solution
6. Loss of electrons is called:
- Oxidation
- Reduction
- Hydration
- Dehydration
7. Fuel cells convert chemical energy into:
- Heat energy
- Light energy
- Electrical energy
- Mechanical energy
8. Electrolysis is used for:
- Electroplating
- Manufacture of sodium metal
- Manufacture of Al
- All of these
9. Nelson’s cell and Down’s cell are example of:
- Electrochemical cell
- Galvanic cell
- Electrolytic cell
- None of these
10. The oxidation number of Cr in K2Cr2O7 is:
- +14
- +12
- +6
- +13
11. The electrolyte used in fuel cell is:
- Aqueous Naci
- Molten NaCl
- KOH
- NaNO3
12. Which one is not an electrolyte:
- Aqueous Naci
- Aqueous CuSO4
- Cu metal
- H2SO4
13. Oxidation state of Mn is MnO42-.is
- + 4
- +6
- +5
- -6
14. In H2O2 the oxidation state of oxygen is:
- +1
- -1
- +2
- -2
15. Electrode potential of S.H.E arbitrarily taken in volts is:
- 0.00
- 1.00
- 0.01
- 0.50
16. Oxidation number of chromium in K2Cr2O7 is:
- 2
- 4
- 6
- 12
17. E.M.f of Zn-Cu cell is:
- 0.0V
- 0.5 V
- 1.0V
- 1.10V
18. The oxidation number of Mn in KMnO4 is:
- 3
- 5
- 7
- 9
19. The oxidation potential of (S.H.E) is:
- 0.02V
- 0.1V
- 0.00V
- 0.20V
20. The highest reduction potential in the electrochemical series is of Fz and its value is:
- +3.87V
- 3.87V
- +2.87 V
- -2.87V
21. Percentage of H2SO4 used in lead accumulator is:
- 40%
- 25%
- 30%
- 50%
22. Cathode in NICAD cell is:
- Ag2O
- NiO2
- Cd
- Zn
23. According to classical concept, oxidation involves:
- Addition of oxygen
- Removal of hydrogen
- Increase in oxidation state
- All of above
24. In Na2O2, the oxidation state of oxygen is:
- -2
- +2
- -1
- +1
25. The extraction of Na-metal by electrolysis of fused NaCl is carried out in:
- Down’s cell
- Fuel cell
- Nelson’s cell
- Voltaic cell
26. When one metal is deposited on the surface of the other by the process of electrical current, it is called:
- Electrolysis
- Electrolytic refining
- Electroplating
- Electrolytic
Sulphur has the highest state in:
- SO2
- SOD
- H2S
- H2SO0
28. The cell in which electrical energy is converted into chemical energy is called:
- Galvanic cell
- Electrolytic cell
- Fuel cell
- Daniel cell
29. In rusting of iron shown by the reaction 4Fe + 3O2 → 2F2O3, Iron is:
- Precipitated
- Reduced
- Hydrolyzed
- Oxidized
30. Electrochemical series is the arrangement of the electrodes in:
- Increasing order of reduction potentials
- Decreasing order of reduction potentials
- Increasing order of oxidation reduction potential
- there is not fixed arrangement
31. When aqueous NaCl is electrolyzed, which of the following get discharged at cathode:
- H+
- Na
- OH
- CI
32. The oxidation number of chromium in Cr2O3 is:
- +3
- +4
- +6
- +12
33. Gain of electrons is called:
- Oxidation
- Reduction
- Dissociation
- Electrolysis
34. A decrease in oxidation number is called:
- Oxidation
- Reduction
- Neutralization
- e.m.f
35. Electrolysis is the process in which a chemical reaction takes place at the expense of:
- Chemical energy
- Electrical energy
- Heat energy
- Solar energy
36. Those cells which cannot be recharged are called:
- Primary cell
- Secondary cell
- Tertiary cell
- None of these
37. Fuel cell converts chemical energy into:
- Heat energy
- Electrical energy
- Magnetic energy
- Sound energy
38. Which one of the following cells is used for the extraction of Na metal:
- Nelson’s cell
- Galvanic cell
- Down’s cell
- All of these cells
39. Oxidation state of carbon in glucose (C6H12O6) is:
- Zero
- One
- Two
- Four
40. The oxidation number of nitrogen in HNO3 is:
- +3
- -3
- -5
- +5
41. The best reducing agent is:
- F1
- CI-1
- Br-1
- I-1
42. Galvanic cells which cannot be re-charged are called:
- Diffused cells
- Secondary cells
- Tertiary cells
- Primary cells
43. Oxidation number of oxygen in OF2 is:
- Zero
- -1/2
- +2
- -1