This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 24 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 24 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Q5 . A salt bridge may contain A) A saturated solution of KCl and agar-agar. B) A saturated solution of KNO3 and agar-agar. C) A saturated solution of NH4NO3 and agar-agar. D) All of these. Show Answer Correct Answer: D) All of these. 2. What is the Nernst equation and its significance in electrochemistry? A) The Nernst equation is E = E$^\circ$-(RT/nF)ln(Q) and is significant for calculating cell potentials under non-standard conditions. B) The Nernst equation is irrelevant in electrochemistry. C) The Nernst equation is used to calculate reaction rates. D) The Nernst equation is E = E$^\circ$ + (RT/nF)ln(Q) for standard conditions. Show Answer Correct Answer: A) The Nernst equation is E = E$^\circ$-(RT/nF)ln(Q) and is significant for calculating cell potentials under non-standard conditions. 3. What are the products formed at the anode and the cathode during the electrolysis of molten magnesium oxide using carbon electrodes? A) Anode:Oxygen Cathode:Magnesium. B) Anode:Magnesium Cathode:Oxygen. C) Anode:Hydrogen Cathode:Oxygen. D) Anode:Oxygen Cathode:Hydrogen. Show Answer Correct Answer: A) Anode:Oxygen Cathode:Magnesium. 4. The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively A) Acidic, acidic, basic. B) Basic, acidic, basic. C) Basic, neutral, basic. D) None. Show Answer Correct Answer: B) Basic, acidic, basic. 5. What concentration of Ag$^{+}$ is present in the following electrochemical cell if E =-0.683 V and E$^\circ$ (Ag$^{+}$) = +0.799 V at 25$^\circ$C?Ag | Ag$^{+}$ (? M) || H$^{+}$ (1.0 M) | H$_{2}$ (1.0 atm) | Pt A) 1.1 x 10$^{-2}$ M. B) 9.3 x 10$^{-26}$ M. C) 9.1 x 10$^{-1}$ M. D) 9.1 x 10$^{1}$ M. Show Answer Correct Answer: A) 1.1 x 10$^{-2}$ M. 6. What is a cathode? A) It is the electrode where oxidation takes place. B) It is the electrode where reduction takes place. C) It is an aqueous solution containing an electrode. D) It is the salt bridge that connects half-cells. Show Answer Correct Answer: B) It is the electrode where reduction takes place. 7. In which of the following conditions salt bridge is not required in a galvanic cell? A) When galvanic cell is used in geyser. B) When distance between oxidation half cell and reduction half cell is negligible. C) Electrolytic solutions used in both the half cells are of same concentration. D) When both the electrodes are dipped in the same electrolytic solution. Show Answer Correct Answer: D) When both the electrodes are dipped in the same electrolytic solution. 8. The unit of conductance cannot be expressed in A) Mho. B) Ohm/m. C) Siemen (S). D) (ohm)-1. Show Answer Correct Answer: D) (ohm)-1. 9. If the E$^{o}$cell for a given reaction has a negative value, then which of the following gives the correct relationships for the values of $\Delta$G$^{0 }$and K$_{eq.}$ A) $\Delta$G$^{0 }$ > 0 ; K$_{eq.}$<1. B) $\Delta$G$^{0 }$ > 0 ; K$_{eq.}$>1. C) $\Delta$G$^{0 }$ < 0 ; K$_{eq.}$>1. D) $\Delta$G$^{0 }$ < 0 ; K$_{eq.}$<1. Show Answer Correct Answer: A) $\Delta$G$^{0 }$ > 0 ; K$_{eq.}$<1. 10. Hydrogen electrode as a reference electrode can be used as which of the following? A) Anode only. B) Cathode only. C) Anode or Cathode. D) Salt bridge. Show Answer Correct Answer: C) Anode or Cathode. 11. Which of the following is a correct representation of the Nernst equation? A) $E = E^0-\frac{RT}{nF} \ln Q$. B) $E = E^0 + \frac{RT}{nF} \ln Q$. C) $E = E^0-\frac{nF}{RT} \ln Q$. D) $E = E^0 + \frac{nF}{RT} \ln Q$. Show Answer Correct Answer: A) $E = E^0-\frac{RT}{nF} \ln Q$. 12. In an electrochemical cell, which component is responsible for allowing the flow of ions between the two half-cells? A) Salt bridge. B) Electrode. C) Battery. D) Voltmeter. Show Answer Correct Answer: A) Salt bridge. 13. During a chemistry experiment, Harper, Evelyn, and Maya are examining different electrodes. They come across a cathode. What is a cathode according to their understanding? A) It is the electrode where oxidation takes place. B) It is the electrode where reduction takes place. C) It is an aqueous solution containing an electrode. D) It is the salt bridge that connects half-cells. Show Answer Correct Answer: B) It is the electrode where reduction takes place. 14. From the following metal which is the most active one. A) Al. B) Mg. C) Cu. D) Zn. Show Answer Correct Answer: B) Mg. 15. What is the oxidation number of manganese in KMnO$_{4}$? A) +7. B) +2. C) +3. D) +4. Show Answer Correct Answer: A) +7. 16. A voltaic cell converts electrical energy to chemical energy. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 17. What is the primary function of a salt bridge in a galvanic cell? A) To allow the flow of electrons between electrodes. B) To maintain electrical neutrality by allowing the flow of ions. C) To increase the voltage of the cell. D) To prevent the mixing of different solutions. Show Answer Correct Answer: B) To maintain electrical neutrality by allowing the flow of ions. 18. A voltaic cells in which a fuel substance undergoes oxidation and from which electrical energy is continuously obtained. A) Dry cells. B) Lead storage batteries. C) Fuel cells. D) None of the above. Show Answer Correct Answer: C) Fuel cells. 19. Assuming that the redox reaction in the galvanic cell:Fe + Cu$^{2+ }$ $\rightarrow$Fe$^{2+}$ + CuWhat is the movement of electrons? A) Fe to Cu. B) Cu to Fe. C) All the above. D) None of the above. Show Answer Correct Answer: A) Fe to Cu. 20. The value which decreases with dilution is A) Conductivity. B) Equivalent conductivity. C) Molar conductivity. D) Conductance. Show Answer Correct Answer: A) Conductivity. 21. What is the importance of electrode materials in electrochemical cells? A) Electrode materials are irrelevant in determining the voltage of a cell. B) Electrode materials are essential for efficient electron transfer, affecting the performance and efficiency of electrochemical cells. C) Electrode materials are only important for aesthetic purposes. D) The choice of electrode materials has no impact on cell temperature. Show Answer Correct Answer: B) Electrode materials are essential for efficient electron transfer, affecting the performance and efficiency of electrochemical cells. 22. Which of the following reactions at an electrode is an example of oxidation? A) \(\text\{Cu\}^\{2+\} + 2\text\{e\}^-\rightarrow \text\{Cu\}(s)\). B) \(\text\{2Cl\}^-\rightarrow \text\{Cl\} 2(g) + 2\text\{e\}^-\). C) \(\text\{2H\} 2\text\{O\} + 2\text\{e\}^-\rightarrow \text\{H\} 2(g) + 2\text\{OH\}^-\). D) \(\text\{Na\}^+ + \text\{e\}^-\rightarrow \text\{Na\}(s)\). Show Answer Correct Answer: B) \(\text\{2Cl\}^-\rightarrow \text\{Cl\} 2(g) + 2\text\{e\}^-\). 23. What is the only chemical product when hydrogen and oxygen are reacted together in a fuel cell? A) Water. B) Electricity. C) Carbon dioxide. D) None of the above. Show Answer Correct Answer: A) Water. 24. Effect of acid and bases on non aqueous solvent was not explained by A) Lewis concept. B) Lowery bronsted theory. C) Arrhenius theory. D) None of the above. Show Answer Correct Answer: C) Arrhenius theory. 25. Reactions that use more energy than they produce A) Endothermic. B) Exothermic. C) Hyperbaric. D) Barbaric. Show Answer Correct Answer: A) Endothermic. ← PreviousNext →Related QuizzesClass 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 1Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 2Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 3Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 4Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 5Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 6Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 7Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 8Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 9Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books