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Electrochemistry MCQ

Class 12 | Chemistry

1. Which of the following processes occurs at the anode in an electrochemical cell?
   a) Reduction
   b) Oxidation
   c) Reduction and oxidation
   d) None of the above
2. In the cell notation, which symbol represents the salt bridge?
   a) |
   b) ||
   c) ||
   d) |||
3. What is the function of a salt bridge in an electrochemical cell?
   a) It conducts electricity between the electrodes.
   b) It prevents the electrodes from reacting with each other.
   c) It maintains a constant pH in the cell.
   d) It increases the rate of reaction at the electrodes.
4. Which metal is commonly used as the reference electrode in a standard hydrogen electrode (SHE)?
   a) Copper
   b) Silver
   c) Platinum
   d) Gold
5. What is the standard hydrogen electrode (SHE) used as a reference for?
   a) Measuring temperature
   b) Measuring pressure
   c) Measuring voltage
   d) Measuring concentration
6. The cell potential is the difference in _ between the two half-cells.
   a) Temperature
   b) Pressure
   c) Electric potential
   d) Concentration
7. Which of the following factors affects the cell potential of an electrochemical cell?
   a) Concentration of reactants and products
   b) Surface area of the electrodes
   c) Length of the salt bridge
   d) All of the above
8. What is the unit of cell potential in electrochemistry?
   a) Volts
   b) Amps
   c) Coulombs
   d) Ohms
9. The standard reduction potential is measured with respect to which reference electrode?
   a) Ag/AgCl electrode
   b) Standard hydrogen electrode (SHE)
   c) Calomel electrode
   d) Platinum electrode
10. Which electrode is used in the measurement of pH?
    a) Platinum electrode
    b) Glass electrode
    c) Calomel electrode
    d) Silver electrode
11. The Nernst equation relates the cell potential to the _.
    a) Standard reduction potential
    b) Temperature
    c) Concentration of reactants and products
    d) Surface area of the electrodes
12. In a galvanic cell, the electrons flow from _.
    a) Anode to cathode
    b) Cathode to anode
    c) Salt bridge to anode
    d) Cathode to salt bridge
13. Which type of cell generates electrical energy from a spontaneous chemical reaction?
    a) Electrolytic cell
    b) Galvanic cell
    c) Electrochemical cell
    d) None of the above
14. The process of passing an electric current through a non-spontaneous chemical reaction is called _.
    a) Oxidation
    b) Reduction
    c) Electrolysis
    d) Galvanization
15. Which of the following is an example of a non-spontaneous redox reaction that can be driven by electrolysis?
    a) Rusting of iron
    b) Discharging a battery
    c) Electroplating
    d) Combustion of hydrogen
16. What is the primary function of the anode in an electrolytic cell?
    a) To produce electrons
    b) To attract cations
    c) To attract anions
    d) To release cations
17. What is the product formed at the cathode during the electrolysis of water?
    a) Hydrogen gas
    b) Oxygen gas
    c) Sodium ions
    d) Chlorine gas
18. Which law governs the amount of substance liberated during electrolysis?
    a) Faraday’s first law of electrolysis
    b) Newton’s law of gravitation
    c) Boyle’s law
    d) Charles’s law
19. What is the charge of one mole of electrons?
    a) 1 C
    b) 1 F
    c) 96,500 C
    d) 6.022 x 10^23 C
20. Which of the following is NOT a common application of electrochemistry?
    a) Electroplating
    b) Production of aluminum from bauxite
    c) Corrosion of metals
    d) Making candles

Key

1. b) Oxidation
2. ||
3. b) It prevents the electrodes from reacting with each other.
4. c) Platinum
5. c) Measuring voltage
6. c) Electric potential
7. a) Concentration of reactants and products
8. a) Volts
9. b) Standard hydrogen electrode (SHE)
10. b) Glass electrode
11. c) Concentration of reactants and products
12. b) Cathode to anode
13. b) Galvanic cell
14. c) Electrolysis
15. c) Electroplating
16. a) To produce electrons
17. a) Hydrogen gas
18. a) Faraday’s first law of electrolysis
19. c) 96,500 C
20. d) Making candles