Unit 7: Electrochemistry
- What does the “i” represent in the van ‘t Hoff equation for osmotic pressure?
- A) Current
- B) Ideal gas constant
- C) Number of particles formed in solution
- D) Temperature
- Answer: C) Number of particles formed in solution
- What is the primary cause of polarization in an electrolytic cell?
- A) Overvoltage
- B) Low current
- C) High temperature
- D) Low concentration of electrolyte
- Answer: A) Overvoltage
- In a concentration cell, what causes the cell potential to develop?
- A) Different electrode materials
- B) Different electrode potentials
- C) Different ion concentrations in the electrolyte
- D) Different temperatures of the solutions
- Answer: C) Different ion concentrations in the electrolyte
- What is the Nernst equation used to determine in electrochemical cells?
- A) Standard cell potential
- B) Reaction rate
- C) Cell potential under non-standard conditions
- D) Heat of reaction
- Answer: C) Cell potential under non-standard conditions
- Which of the following is a correct statement about the Gibbs free energy change (ΔG) and the cell potential (E) of an electrochemical cell?
- A) ΔG = -nFE
- B) ΔG = nFE
- C) ΔG = -FE
- D) ΔG = nF/E
- Answer: A) ΔG = -nFE
- The quantity of electricity required to deposit one mole of a substance is called:
- A) Faraday constant
- B) Equivalent weight
- C) Faraday’s constant
- D) Molar mass
- Answer: A) Faraday constant
- What is the effect of increasing the concentration of the electrolyte on the conductivity of the solution?
- A) Conductivity decreases
- B) Conductivity remains constant
- C) Conductivity increases
- D) Conductivity fluctuates
- Answer: C) Conductivity increases
- What is the Faraday constant approximately equal to?
- A) 96485 C/mol
- B) 96500 C/mol
- C) 100000 C/mol
- D) 50000 C/mol
- Answer: A) 96485 C/mol
- Which type of reaction does the galvanic cell facilitate?
- A) Endothermic reaction
- B) Exothermic reaction
- C) Spontaneous redox reaction
- D) Non-spontaneous redox reaction
- Answer: C) Spontaneous redox reaction
- What happens to the cell potential of an electrochemical cell if the temperature is increased?
- A) It decreases
- B) It remains constant
- C) It increases
- D) It becomes zero
- Answer: C) It increases
This website uses cookies.