Electro Chemistry, Cells, and Batteries Solved MCQs

Electro Chemistry, Cells, & Batteries

1. What is the process of a substance gaining electrons called?

a) Oxidation

b) Reduction

c) Electrolysis

d) Ionization

2. In a galvanic cell, where does oxidation occur?

a) Anode

b) Cathode

c) Electrolyte

d) Salt bridge

3. What is the SI unit of electric charge?

a) Ampere

b) Coulomb

c) Volt

d) Ohm

4 Which of the following is a non-spontaneous process in an electrochemical cell?

a) Oxidation

b) Reduction

c) Electrolysis

d) Galvanization

5. What is Faraday's law of electrolysis related to?

a) Heat transfer

b) Electron transfer

c) Mass deposition during electrolysis

d) Voltage generation

6. What happens during oxidation in a redox reaction?

a) Gain of electrons

b) Loss of electrons

c) Gain of protons

d) Loss of protons

7. In the electrochemical cell, where does oxidation occur?

a) Anode

b) Cathode

c) Electrolyte

d) Salt bridge

8. Which species is being reduced in the following half-reaction:

\(Cu{2+} + 2e - \ → Cu\)

a) Cu

b) Cu2+

c) e-

d) None of the above

9. In a voltaic cell, where does the flow of electrons occur?

a) Anode to cathode

b) Cathode to anode

c) Anode to electrolyte

d) Cathode to electrolyte

10. What is the standard reduction potential of hydrogen ion (H+)?

a) 0 V

b) +0.34 V

c) -0.76 V

d) +1.23 V

11. What is oxidation in terms of gain or loss of oxygen and hydrogen in electrochemistry?

a. Gain of oxygen, loss of hydrogen

b. Loss of oxygen, gain of hydrogen

c. Gain of oxygen, gain of hydrogen

d. Loss of oxygen, loss of hydrogen

12. Which statement accurately describes reduction in electrochemical reactions?

a. Gain of oxygen, gain of hydrogen

b. Loss of oxygen, loss of hydrogen

c. Gain of oxygen, loss of hydrogen

d. Loss of oxygen, gain of hydrogen

13. In the reaction: 2H₂O → O₂ + 4H⁺ + 4e⁻, what is happening to oxygen?

a. Oxygen is gaining electrons

b. Oxygen is losing electrons

c. Oxygen is gaining protons

d. Oxygen is losing protons

14. During oxidation, what is typically observed in terms of electrons?

a. Electrons are gained

b. Electrons are lost

c. No change in electrons

d. Electrons are shared

15. Which of the following represents a balanced redox reaction?

a. 2H₂ + O₂ → 2H₂O

b. Zn + CuSO₄ → ZnSO₄ + Cu

c. 2NaCl → Na₂ + Cl₂

d. 2AgNO₃ + Mg → Mg(NO₃)₂ + 2Ag

16. What is oxidation in terms of electron transfer?

a. Gain of electrons

b. Loss of electrons

c. Both a and b

d. Neither a nor b

17. Reduction involves:

a. Gain of electrons

b. Loss of electrons

c. No electron transfer

d. Both a and c

18. In a redox reaction, the reducing agent:

a. Gains electrons

b. Loses electrons

c. Neither gains nor loses electrons

d. Undergoes a phase change

19. What happens to an element that is oxidized?

a. Gains electrons

b. Loses electrons

c. Remains unchanged

d. Converts to a different element

20. Identify the oxidizing agent in a chemical reaction:

a. Substance gaining electrons

b. Substance losing electrons

c. Substance with no change in electrons

d. Inert substance

21. What is the nature of electrochemical processes?

a. Mechanical

b. Thermal

c. Chemical

d. Electrical

22. The standard unit of electrochemical potential is:

a. Volt

b. Ampere

c. Ohm

d. Joule

23. What is Faraday's first law of electrolysis?

a. The mass of a substance deposited during electrolysis is directly proportional to the current passed.

b. The voltage applied is directly proportional to the rate of electrolysis.

c. The quantity of electricity passed is directly proportional to the equivalent weight of the substance deposited.

d. The mass of a substance deposited during electrolysis is inversely proportional to the time of electrolysis.

24. Which electrochemical process is used to protect iron from corrosion?

a. Electroplating

b. Galvanization

c. Electrolysis

d. Electrolytic refining

25. What is corrosion in the context of electrochemistry?

a) Formation of a protective layer on metals

b) Increase in conductivity of metals

c) Deterioration of metals due to chemical reactions

d) Enhancement of metal strength

26. Which of the following is a common form of corrosion?

a) Oxidation

b) Rusting

c) Alloying

d) Annealing

27. What is the primary cause of rusting in iron?

a) Exposure to air

b) Presence of water

c) Both air and water

d) High temperature

28. How can corrosion be prevented in metals?

a) Increasing temperature

b) Reducing exposure to light

c) Applying protective coatings

d) Mixing metals

29. Which metal is known for its resistance to corrosion?

a) Iron

b) Stainless steel

c) Aluminum

d) Copper

30. What role does anodic protection play in preventing corrosion?

a) Enhances corrosion

b) Suppresses corrosion at anodic sites

c) Increases metal conductivity

d) Promotes rusting

31. Which electrochemical process is associated with the corrosion of metals?

a) Electroplating

b) Galvanic corrosion

c) Electrophoresis

d) Electrolysis

32. What is the purpose of sacrificial anodes in corrosion prevention?

a) Increase metal conductivity

b) Promote corrosion

c) Sacrifice themselves to protect the main metal

d) Enhance metal hardness

33. How does cathodic protection prevent corrosion?

a) By increasing metal reactivity

b) By supplying electrons to the metal

c) By promoting rust formation

d) By exposing the metal to air

34. What is the primary role of inhibitors in corrosion control?

a) Increase metal hardness

b) Promote rusting

c) Suppress corrosion reactions

d) Enhance metal conductivity

35. What is the primary purpose of electroplating in the context of electrochemistry?

a) To increase the electrical conductivity of metals

b) To enhance the aesthetic appearance of surfaces

c) To reduce the weight of metals

d) To protect metals from corrosion

36. Which metal is commonly used as the coating material in the electroplating process?

a) Aluminum

b) Chromium

c) Copper

d) Silver

37. In electroplating, what role does the anode play in the process?

a) Attracts electrons from the cathode

b) Provides metal ions for deposition

c) Acts as a barrier to prevent deposition

d) Initiates the corrosion of the substrate

38. What electrolyte is typically used in the electroplating of silver?

a) Sodium chloride

b) Silver chloride

c) Silver nitrate

d) Sodium nitrate

39. What effect does increasing the current in electroplating have on the deposition rate?

a) Decreases the deposition rate

b) Has no effect on the deposition rate

c) Increases the deposition rate

d) Causes uneven deposition

40. What is the primary function of a cathode in electrochemistry?

a. Oxidation

b. Reduction

c. Both A and B

d. Electron transport

41. Which type of cell generates electrical energy through spontaneous chemical reactions?

a. Electrolytic cell

b. Voltaic cell

c. Galvanic cell

d. Faraday cell

42. In electrochemical cells, the anode is associated with:

a. Reduction

b. Oxidation

c. Electron acceptance

d. None of the above

43. What is the role of the salt bridge in a galvanic cell?

a. Facilitates electron flow

b. Maintains electrical neutrality

c. Enhances cell voltage

d. Acts as a catalyst

44. The standard hydrogen electrode (SHE) is used as a reference in electrochemistry. What is its standard electrode potential?

a. 0.00 V

b. 1.00 V

c. -1.36 V

d. 0.76 V

45. Which type of battery utilizes a solid electrolyte?

a) Dry Battery

b) Liquid Battery

c) Both

d) Neither

46. What is the electrolyte in a typical liquid battery?

a) Solid

b) Water

c) Liquid solution

d) Gas

47. Which battery type is prone to leakage and requires periodic maintenance?

a) Dry Battery

b) Liquid Battery

c) Both

d) Neither

48. In a dry battery, what type of electrolyte is commonly used?

a) Gel

b) Liquid

c) Solid

d) Gas

49. What is the advantage of dry batteries over liquid batteries in terms of portability?

a) Dry batteries are lighter

b) Liquid batteries are lighter

c) Both have equal weight

d) Weight is not a factor

50. What is the role of the cathode in an electrochemical cell?

a) Source of electrons

b) Electron acceptor

c) Electron donor

d) None of the above

51. In a galvanic cell, where does reduction occur?

a) Anode

b) Cathode

c) Both anode and cathode

d) Neither anode nor cathode

52. What is the function of the anode in electrolysis?

a) Gains electrons

b) Releases electrons

c) Attracts electrons

d) None of the above

53. During discharge in a battery, which electrode undergoes oxidation?

a) Cathode

b) Anode

c) Both cathode and anode

d) Neither cathode nor anode

54. Which statement is true about the cathode in electrolysis?

a) It attracts cations

b) It attracts anions

c) It releases anions

d) It releases cations

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