Unit 7: Electrochemistry

  1. The quantity of electric charge required to deposit one mole of a substance at an electrode is:
    • A) One Faraday
    • B) Two Faradays
    • C) Three Faradays
    • D) Four Faradays
    • Answer: A) One Faraday
  2. What does the symbol “E°” represent in electrochemical cells?
    • A) The standard electrode potential
    • B) The cell potential at non-standard conditions
    • C) The electrode potential under actual conditions
    • D) The equilibrium constant
    • Answer: A) The standard electrode potential
  3. In a concentration cell, the electrode with the higher concentration is:
    • A) The anode
    • B) The cathode
    • C) The salt bridge
    • D) The reference electrode
    • Answer: B) The cathode
  4. Which of the following is true about the standard reduction potential of a half-cell?
    • A) It is always positive
    • B) It is always negative
    • C) It can be positive or negative
    • D) It is always zero
    • Answer: C) It can be positive or negative
  5. What is the effect of increasing the concentration of reactants on the cell potential of a galvanic cell?
    • A) The cell potential decreases
    • B) The cell potential remains constant
    • C) The cell potential increases
    • D) The cell potential becomes zero
    • Answer: C) The cell potential increases
  6. The electrochemical series lists metals and their:
    • A) Atomic weights
    • B) Standard reduction potentials
    • C) Solubility products
    • D) Thermal conductivities
    • Answer: B) Standard reduction potentials
  7. In an electrolytic cell, the anode is the electrode where:
    • A) Reduction occurs
    • B) Oxidation occurs
    • C) Dissolution occurs
    • D) Precipitation occurs
    • Answer: B) Oxidation occurs
  8. What is the main purpose of the platinum electrode in electrochemical cells?
    • A) To serve as a reference electrode
    • B) To conduct electrons
    • C) To act as a catalyst
    • D) To supply a stable potential
    • Answer: B) To conduct electrons
  9. In a galvanic cell, the salt bridge:
    • A) Facilitates electron flow
    • B) Maintains electrical neutrality
    • C) Provides a source of electrons
    • D) Increases the rate of reaction
    • Answer: B) Maintains electrical neutrality
  10. Which factor does not affect the cell potential of an electrochemical cell?
    • A) Temperature
    • B) Concentration of reactants and products
    • C) Type of electrode material
    • D) Electrical resistance of the cell
    • Answer: D) Electrical resistance of the cell

Page: 1 2 3 4 5 6 7 8 9 10 11

This website uses cookies.