This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 36 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 36 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A reactions that produces more energy than it takes in A) Endothermic. B) Exothermic. C) Hyperbaric. D) Barbaric. Show Answer Correct Answer: B) Exothermic. 2. How is voltaic cell electricity produced? A) A chemical reaction. B) It is pumped into the cell. C) It injects itself. D) An injected chemical reaction. Show Answer Correct Answer: A) A chemical reaction. 3. What is the effect of increasing the concentration of reactants in an electrochemical cell? A) It decreases the cell potential. B) It has no effect on the cell potential. C) It increases the cell potential. D) It reverses the direction of the reaction. Show Answer Correct Answer: C) It increases the cell potential. 4. Without losing its concentration ZnCl2 solution cannot be kept in contact with A) Au. B) Al. C) Pb. D) Ag. Show Answer Correct Answer: B) Al. 5. The equilibrium constants of two redox reactions X and Y are 1.5 x10$^{15}$ and 5.5 x 10$^{16}$ . Reaction X is more spontaneous than Y. A) FALSE. B) TRUE. C) All the above. D) None of the above. Show Answer Correct Answer: A) FALSE. 6. In the following reactionSn$^{2+}$ + 2Fe$^{3+}$ $\rightarrow$ Sn$^{4+ }$+ 2Fe$^{2+}$the oxidizing agent is ..... A) Sn$^{4+}$. B) Sn$^{2+}$. C) Fe$^{3+}$. D) Fe$^{2+}$. Show Answer Correct Answer: C) Fe$^{3+}$. 7. A higher reduction potential in a galvanic cell indicates that a substance is more likely to: A) Undergo oxidation. B) Undergo reduction. C) Act as an electrolyte. D) Remain inert. Show Answer Correct Answer: B) Undergo reduction. 8. Which of the following is an example of a spontaneous redox reaction? A) Charging a rechargeable battery. B) Electrolysis of water. C) The rusting of iron. D) Splitting water into hydrogen and oxygen gas. Show Answer Correct Answer: C) The rusting of iron. 9. What happens to an atom when it is oxidized? A) It gains electrons. B) It loses electrons. C) It gains protons. D) It loses neutrons. Show Answer Correct Answer: B) It loses electrons. 10. The oxidation number of chlorine in HClO4 A) +5. B) +6. C) +7. D) +8. Show Answer Correct Answer: C) +7. 11. How does electrolysis contribute to clean energy technologies? A) By splitting water into hydrogen and oxygen gases. B) By converting hydrogen into water. C) By converting carbon dioxide into oxygen. D) By converting oxygen into hydrogen. Show Answer Correct Answer: A) By splitting water into hydrogen and oxygen gases. 12. Using iron as a cathode to prevent corrosion A) Cathodic protection. B) Passivation. C) Galvanization. D) Coating. Show Answer Correct Answer: A) Cathodic protection. 13. The half-cells are connected by a ..... , which is a tube containing a strong electrolyte, often potassium sulfate A) Metallic wire. B) Salt bridge. C) Magnetic bridge. D) None of the above. Show Answer Correct Answer: B) Salt bridge. 14. Describe the components of an electrolytic cell. A) Electrodes, electrolyte solution, external power source, wires. B) Electrodes, salt, power outlet, plastic tubing. C) Cathode, anode, water, light bulb. D) Cathode, anode, salt bridge, voltmeter. Show Answer Correct Answer: A) Electrodes, electrolyte solution, external power source, wires. 15. Thickness of ionic atmosphere is represented as A) 1/k. B) K. C) N. D) 1/K. Show Answer Correct Answer: A) 1/k. 16. When aqueous ammonia is added to CuSO4 solution, the solution turns deep blue A) NH3 replaces H2O. B) H2O replaces NH3. C) NH3 remains. D) H2O remains. Show Answer Correct Answer: B) H2O replaces NH3. 17. Oxidation occurs at the A) Anode. B) Cathode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Anode. 18. The electronic configuration of Cu(II) is 3d$^{9}$ whereas that of Cu(I) is 3d$^{10}$. Which of the following is correct? A) Cu(II) is more stable in aqueous solution. B) Cu(II) is less stable in aqueous solution. C) Cu(I) and Cu(II) are equally stable. D) Stability of Cu(I) and Cu(II) depends on nature of copper salts. Show Answer Correct Answer: A) Cu(II) is more stable in aqueous solution. 19. Question 5Which cell do you think is more sustainable for future technology? A) Chemical cell-because it is renewable and uses clean fuel only. B) Electrolytic cell-because it is efficient in reversing chemical reactions. C) Chemical cell-because it is used in rechargeable battery technology. D) None of the above. Show Answer Correct Answer: C) Chemical cell-because it is used in rechargeable battery technology. 20. Reduction is the process of gaining electron. A) True. B) Flase. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 21. Which of the following is an example of electrolyte? A) Naphthalene, C$_{10}$H$_{8}$. B) Acetamide, CH$_{3}$CONH$_{2}$. C) Ethanol, C$_{2}$H$_{5}$OH. D) Copper(II) sulphate solution, CuSO$_{4}$. Show Answer Correct Answer: D) Copper(II) sulphate solution, CuSO$_{4}$. 22. How many electrons is needed to transform Fe$^{2+}$ ion to solid state? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 23. A cell reaction is spontaneous A) $\Delta$G$^\circ$ is positive. B) $\Delta$G$^\circ$ is negaitive. C) E$^\circ$ is positive. D) E$^\circ$ is negaitive. Show Answer Correct Answer: B) $\Delta$G$^\circ$ is negaitive. 24. The size of an electrical current depends on ..... potential difference A) The direction of the. B) The size of the. C) The source of the. D) Whether there is a. Show Answer Correct Answer: B) The size of the. 25. At 25$^{0}$ C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm$^{-1}$cm$^{2}$mol$^{-1}$ and at infinite dilution its molar conductance is 238 ohm$^{-1}$cm$^{2}$mol$^{-1}$. The degree of ionization of ammonium hydroxide at the same concentration and temperature is A) 4.008 %. B) 40.800 %. C) 2.080 %. D) 20.800 %. Show Answer Correct Answer: A) 4.008 %. ← 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