This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Cell potential is proportional to the slope of the Gibbs energy with respect to the extent of the reaction. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. In the reaction:Fe + Cu$^{2+ }$ $\rightarrow$Fe$^{2+}$ + CuWhich half-reaction can be found in the anode? A) Cu$^{2+}$$\rightarrow$Cu + 2e$^{-}$. B) Cu$^{2+ }$+ 2e$\rightarrow$ Cu. C) Fe $\rightarrow$ Fe$^{2+ }$+ 2e$^{-}$. D) Fe + 2e$^{-}$ $\rightarrow$ Fe$^{2+}$. Show Answer Correct Answer: C) Fe $\rightarrow$ Fe$^{2+ }$+ 2e$^{-}$. 3. Which of the following is a common method to prevent corrosion? A) Applying a protective coating. B) Exposing the metal to acids. C) Heating the metal. D) Keeping the metal in a vacuum. Show Answer Correct Answer: A) Applying a protective coating. 4. In the anode, the metal strip will gradually ..... A) Decrease in size. B) Increase in size. C) Stay the same size. D) Dissolve completely. Show Answer Correct Answer: A) Decrease in size. 5. Calculate standard cell potential for this equation:Zn$^{2+}$(aq) + 2e $\rightarrow$ Zn(s) E$^\circ$ =-0.76 VCd$^{2+}$(aq) + 2e $\rightarrow$ Cd(s) E$^\circ$ =-0.40 V A) E$^{o}$cell =-1.16 V. B) E$^{o}$cell = +1.16 V. C) E$^{o}$cell =-0.36 V. D) E$^{o}$cell = +0.36 V. Show Answer Correct Answer: D) E$^{o}$cell = +0.36 V. 6. Is it possible for a cell potential to have NEGATIVE sign? A) NO. B) YES. C) All the above. D) None of the above. Show Answer Correct Answer: A) NO. 7. The substance that is oxidized is referred to as a oxidizing agent. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 8. Given the balanced ionic equation representing a reaction:2Al(s) + 3Cu$^{+2}$$\rightarrow$ 2Al$^{+3}$+ 3Cu(s) Which half-reaction represents the reduction that occurs? A) Al$^{+3}$+3e $\rightarrow$ Al. B) Cu$\rightarrow$ Cu$^{+2}$+2e. C) Cu$^{+2}$+ 2e $\rightarrow$ Cu. D) Al$\rightarrow$ Al$^{+3}$+3e. Show Answer Correct Answer: C) Cu$^{+2}$+ 2e $\rightarrow$ Cu. 9. It is a branch of chemistry that deals with interconversion between chemical and electrical energy. This process involves redox reaction. A) Electromagnetism. B) Electrochemistry. C) Electronic Chemistry. D) None of the choices. Show Answer Correct Answer: B) Electrochemistry. 10. In the standard notation for a voltaic cell, the single vertical line "|" represents A) Gas electrode. B) A phase boundary. C) A salt bridge. D) A wire (metal) connection. Show Answer Correct Answer: B) A phase boundary. 11. The following reaction occurs spontaneously.2Al(s) + 6H$^{+}$(aq) $\rightarrow$ 2Al$^{3+}$(aq) + 3H$_{2}$(g)Write the balanced oxidation half-reaction A) Al$^{3+}$(aq) + 3e$^{-}$ $\rightarrow$ Al(s). B) H$_{2}$(g) $\rightarrow$ 2H$^{+}$(aq) + 2e$^{-}$. C) 2H$^{+}$(aq) $\rightarrow$ H$_{2}$(g) + 2e$^{-}$. D) Al(s) $\rightarrow$ Al$^{3+}$(aq) + 3e$^{-}$. Show Answer Correct Answer: D) Al(s) $\rightarrow$ Al$^{3+}$(aq) + 3e$^{-}$. 12. The oxidation state of the species undergoing reduction is A) Decreased. B) Increased. C) No change. D) None of the above. Show Answer Correct Answer: A) Decreased. 13. A voltaic cell in which the electrolyte is a paste. A) Dry cells. B) Lead storage batteries. C) Fuel cells. D) None of the above. Show Answer Correct Answer: A) Dry cells. 14. A voltaic cell created by a number of cells connected in a series. A) Battery. B) Wet cell. C) Fuel cell. D) Dry cell. Show Answer Correct Answer: A) Battery. 15. The ..... positive the E$^{o}$, the stronger the oxidising agent A) More. B) Less. C) (neither; there is no effect). D) None of the above. Show Answer Correct Answer: A) More. 16. It is defined as energy that converts from electrical to chemical energy vice versa. A) Electrolysis. B) Electrochemical energy. C) Electrochemistry. D) Redox Reaction. E) Electricity. Show Answer Correct Answer: B) Electrochemical energy. 17. A voltaic cell in which the materials to be oxidized or reduced may be continuously supplied. A) Wet cell. B) Battery. C) Fuel cell. D) Dry cell. Show Answer Correct Answer: C) Fuel cell. 18. Question 4How does the direction of energy flow affect the usefulness of each cell? A) Electrolytic cells are more useful because they can create electricity directly. B) Chemical cells are less useful because they only store electricity. C) Electrolytic cells convert electrical energy into chemical energy, while chemical cells do the reverse. D) None of the above. Show Answer Correct Answer: C) Electrolytic cells convert electrical energy into chemical energy, while chemical cells do the reverse. 19. THE ELECTRODES IN ELECTROCHEMICAL CELLS A) NOODLES AND CATHODE. B) ANODE AND CRATES. C) COTHADE AND ONADE. D) CATHODE AND ANODE. Show Answer Correct Answer: D) CATHODE AND ANODE. 20. A certain galvanic cell has for its spontaneous cell reaction:Zn + HgO $\rightarrow$ ZnO + HgWhich is the half-reaction occurring at the anode? A) ZnO + 2 e-$\rightarrow$ Zn. B) HgO + 2 e-$\rightarrow$ Hg + O$^{2-}$. C) Zn$^{2+}$ + 2 e-$\rightarrow$ Zn. D) Zn $\rightarrow$ Zn$^{2+}$ + 2 e-. Show Answer Correct Answer: D) Zn $\rightarrow$ Zn$^{2+}$ + 2 e-. 21. During a thrilling chemistry class, Benjamin, Rohan, and Scarlett were conducting an experiment. They were curious to find out in which substance sulfur has a negative oxidation number. Can you help them solve this exciting mystery? A) Na$_{2}$S. B) SO$_{2}$. C) S. D) CaSO$_{4}$. Show Answer Correct Answer: A) Na$_{2}$S. 22. How does the concentration of ions affect electrode potential? A) It causes the electrode to become more reactive. B) It has no effect on electrode potential. C) It changes the activity of the ions in the solution, affecting the potential difference between the electrode and the solution. D) It increases the resistance of the electrode. Show Answer Correct Answer: C) It changes the activity of the ions in the solution, affecting the potential difference between the electrode and the solution. 23. When carrying out the electrolysis of aluminium oxide, why is cryolite added? A) To decrease the boiling point of aluminium oxide. B) To increase the melting point of aluminium oxide. C) To increase the boiling point of aluminium oxide. D) To decrease the melting point of aluminium oxide. Show Answer Correct Answer: D) To decrease the melting point of aluminium oxide. 24. Increase in conductance with frequency is known as A) Onsager effect. B) Debye Huckel effect. C) Wien effect. D) Debye Falkenhagen effect. Show Answer Correct Answer: D) Debye Falkenhagen effect. 25. Faraday is the unit of A) Capacitance. B) Electrical charge. C) Power. D) Current. Show Answer Correct Answer: B) Electrical charge. 26. Which statement best describes how a salt bridge maintains electrical neutrality in the half-cells of an electrochemical cell? A) It prevents the migration of electrons. B) It prevents the reaction from occurring spontaneously. C) It permits the migration of ions. D) It allows for the reaction from occurring spontaneously. Show Answer Correct Answer: C) It permits the migration of ions. 27. The method of coating metals by immersing the metals in a liquid and then passing an electric current through the liquid is called ..... A) Electroplating. B) Electrolysis. C) Plating. D) Electroplation. Show Answer Correct Answer: A) Electroplating. 28. The function of Salt Bridge A) Maintain electrical neutrality of the cell. B) Complete the circuit of cell. C) Both maintaining the electrical neutrality and also completing the circuit of the cell. D) None of these. Show Answer Correct Answer: C) Both maintaining the electrical neutrality and also completing the circuit of the cell. 29. Which of the following are applications of chemical cell?I Dry cellII Light bulbIII Alkaline batteryIV Silver oxide-mercury battery A) II, III, IV. B) I, III, IV. C) I, II, III. D) I, II, IV. Show Answer Correct Answer: B) I, III, IV. 30. Lily is conducting an experiment in her chemistry class where she observes the conversion of chemical energy into electrical energy. The relationship she is studying is known as ..... A) Redox Reactions. B) Oxidation. C) Electrochemistry. D) Anode. Show Answer Correct Answer: C) Electrochemistry. 31. Type of galvanic cell, that is made of electrochemical cells that cannot be reversed. A) Primary Cells. B) Secondary Cells. C) Voltaic Cells. D) None of the above. Show Answer Correct Answer: A) Primary Cells. 32. In a redox reaction, the oxidizing agent will A) Lose electrons and be reduced. B) Lose electrons and be oxidized. C) Gain electrons and be reduced. D) Gain electrons and be oxidized. Show Answer Correct Answer: C) Gain electrons and be reduced. 33. In a galvanic cell, the anode is the electrode where: A) Oxidation occurs. B) No reaction occurs. C) Electrons are gained. D) Reduction occurs. Show Answer Correct Answer: A) Oxidation occurs. 34. What is a half-reaction? A) It is a reaction at equilibrium where half of the substances are reactants and half of the substances are products. B) It is the reaction that occurs when the switch of a galvanic cell is open. C) It shows EITHER the reduction component or the oxidation component of a redox reaction. D) It shows BOTH the reduction and oxidation components of a redox reaction. Show Answer Correct Answer: C) It shows EITHER the reduction component or the oxidation component of a redox reaction. 35. In fuel cell by product is A) Hydrogen. B) Water. C) Methanol. D) All of these. Show Answer Correct Answer: B) Water. 36. In which of the following does chlorine have an oxidation state of +1? A) Cl$_{2}$. B) NaClO. C) NaClO$_{2}$. D) NaCl. Show Answer Correct Answer: B) NaClO. 37. What is the primary function of electrochemistry in energy conversion? A) To convert chemical energy into electrical energy. B) To convert electrical energy into chemical energy. C) To convert thermal energy into electrical energy. D) To convert mechanical energy into chemical energy. Show Answer Correct Answer: A) To convert chemical energy into electrical energy. 38. The properties of the ..... make a dry cell "dry." A) Cathode. B) Anode. C) Electrolyte. D) Casing. Show Answer Correct Answer: C) Electrolyte. 39. Question 1 Which cell is more relevant in daily life? Why? A) Electrolytic cell-because it powers flashlights and remote controls. B) Chemical cell-because it is used in batteries and portable devices. C) Electrolytic cell-because it releases more energy in one reaction. D) None of the above. Show Answer Correct Answer: B) Chemical cell-because it is used in batteries and portable devices. 40. Calculate the potential (emf) of the cellCd/Cd$^{2+}$(0.10M) // H$^{+}$(0.20M)/Pt, H$_{2}$(0.5 atm)Given E$^{o}$ for Cd$^{2+}$/Cd =-0.403 V A) 4.00 V. B) 3.92 V. C) 0.400 V. D) 0.392V. Show Answer Correct Answer: C) 0.400 V. 41. Which type of electrochemical cell is used as a battery? A) Voltaic. B) Electrolytic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Voltaic. 42. If the molar conductivities (in S cm2 mol-1) of NaCl, KCl and NaOH at infinite dilution are 126, 150 and 250 respectively, the molar conductivity of KOH is:[in S cm2 mol-1] A) 26. B) 274. C) 226. D) 526. Show Answer Correct Answer: B) 274. 43. When KMnO4 acts as an oxidizing agent and ultimately forms MnO42-, MnO2, Mn2O3 and Mn2+, then the number of electrons transferred in each case is A) 1, 3, 4, 5. B) 5, 4, 3, 1. C) 3, 4, 1, 5. D) 4, 5, 31. Show Answer Correct Answer: A) 1, 3, 4, 5. 44. Which is true regarding fuel cell A) Cheap. B) Eco-friendly. C) High efficiency. D) All of these. Show Answer Correct Answer: D) All of these. 45. H$_{2}$O$_{2}$$\rightarrow$ H$_{2}$O A) Oxidation Reaction. B) Reduction Reaction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Reduction Reaction. 46. What is the role of the electrolyte in an electrochemical cell? A) Stores electrical charge. B) Generates heat in the cell. C) Prevents the flow of electrons. D) Facilitates the flow of ions between electrodes. Show Answer Correct Answer: D) Facilitates the flow of ions between electrodes. 47. In electrochemical cell, reduction takes place at A) Top. B) Right. C) Left. D) Bottom. Show Answer Correct Answer: B) Right. 48. How does temperature affect the Nernst equation? A) Higher temperatures decrease the cell potential. B) Temperature only affects the concentration of ions. C) Temperature has no effect on the cell potential. D) Higher temperatures increase the cell potential. Show Answer Correct Answer: D) Higher temperatures increase the cell potential. 49. Sodium ions (Na+) and Hydrogen ions (H+) both attract to the negative cathode, why is hydrogen produced? A) The most reactive element is always formed. B) The least reactive element is always formed. C) It is random each time. D) None of the above. Show Answer Correct Answer: B) The least reactive element is always formed. 50. What is the unit for conductivity? A) (A/m). B) (V/m). C) $\Omega$$^{-1}$ m$^{-1}$. D) $\Omega$/m. Show Answer Correct Answer: C) $\Omega$$^{-1}$ m$^{-1}$. 51. Question 7If one of the cells didn't exist, what would be the impact on science or daily life? A) If electrolytic cells didn't exist, we could not use rechargeable batteries. B) If chemical cells didn't exist, we would have no chemical reactions at all. C) If chemical cells didn't exist, we wouldn't have power banks or AA batteries. D) None of the above. Show Answer Correct Answer: C) If chemical cells didn't exist, we wouldn't have power banks or AA batteries. 52. The electronic configuration of Gadolinium (at no 64) is A) [xe] 4f8 5d0 6s2. B) [xe] 4f7 5d1 6s2. C) [xe] 4f3 5d5 6s2. D) [xe] 4f6 5d0 6s2. Show Answer Correct Answer: B) [xe] 4f7 5d1 6s2. 53. Which of the following is false regarding galvanic cells? A) The reactions taking place are non-spontaneous. B) To set up this cell, a salt bridge is used. C) It converts chemical energy into electrical energy. D) The electrolytes taken in the two beakers are different. Show Answer Correct Answer: A) The reactions taking place are non-spontaneous. 54. What is the purpose of the anode in an electrolytic cell? A) It generates electrical energy. B) It is where oxidation occurs. C) It is where reduction occurs. D) It connects the two half-cells. Show Answer Correct Answer: B) It is where oxidation occurs. 55. In an electrolytic cell, the electrons flow from the ..... A) Anode to the cathode. B) Cathode to the anode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Anode to the cathode. 56. If during d-d transition electron absorb Blue colour then which colour radiation will be emited by electron. A) Red. B) Voilet. C) Orange. D) Yellow. Show Answer Correct Answer: C) Orange. 57. THE ELECTRODES IN THE ELECTROLYTIC CELL ARE CONECTED TO; A) A LOAD (E.G. LIGHT BULB). B) A CELLULAR NETWORK. C) SOCKET. D) A BATTERY. Show Answer Correct Answer: D) A BATTERY. 58. The rate constant for a first order reaction is 60 s$^{-1}$. How much time will it take to reduce the initial concentration of the reactant to its l/10th value? A) .0380. B) .01. C) .09. D) .048. Show Answer Correct Answer: A) .0380. 59. Specific conductance is product of cell constant and ..... A) Conductivity. B) Resistance. C) Conductance. D) Resistivity. Show Answer Correct Answer: C) Conductance. 60. Which of the following statement is TRUE about a Daniell cell? A) Copper electrode is the anode. B) Zinc electrode is the cathode. C) Electron flows from anode to cathode. D) Both electrodes used are graphite rods. Show Answer Correct Answer: C) Electron flows from anode to cathode. ← PreviousNext →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 1Class 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books