This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 12 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is a characteristic of an electrolytic cell? A) It does not involve chemical reactions. B) It generates electrical energy. C) It requires an external power source. D) It operates spontaneously. Show Answer Correct Answer: C) It requires an external power source. 2. What type of reaction occurs when a metal atom becomes a positive ion? A) Oxidation. B) Reduction. C) Double replacement. D) Neutralization. Show Answer Correct Answer: A) Oxidation. 3. Which process requires energy to decompose a substance? A) Electrolysis. B) Neutralization. C) Synthesis. D) Sublimation. Show Answer Correct Answer: A) Electrolysis. 4. Which of the following would begin a reaction when added to a solution of tin(II) chloride, SnCl$_{2}$?(Use your table of standard reduction potentials.) A) Solid copper, Cu. B) Solid gold, Au. C) Solid manganese, Mn. D) Solid silver, Ag. Show Answer Correct Answer: C) Solid manganese, Mn. 5. Which law states that the mass of a substance produced at an electrode during electrolysis is proportional to the number of moles of electrons transferred at that electrode? A) Coulomb's law. B) Ohm's law. C) Faraday's second law of electrolysis. D) Faraday's first law of electrolysis. Show Answer Correct Answer: D) Faraday's first law of electrolysis. 6. Electrochemistry deals with A) Electric energy. B) Chemical energy. C) Only a. D) Both a & b. Show Answer Correct Answer: D) Both a & b. 7. In an electrolytic cell, the positive electrode is the A) Anode, where oxidation occurs. B) Anode where reduction occurs. C) Cathode where reduction occurs. D) None of the above. Show Answer Correct Answer: A) Anode, where oxidation occurs. 8. Where are the electrons found in an atom? A) Outside the nucleus. B) Inside the protons. C) Outside the protons. D) Inside the nucleus. Show Answer Correct Answer: A) Outside the nucleus. 9. Discuss the applications of electrolysis in industry. A) Cooking food, heating water, generating electricity. B) Building construction, road paving, car manufacturing. C) Medical surgeries, dental procedures, veterinary care. D) Electroplating, metal extraction, production of chemicals. Show Answer Correct Answer: D) Electroplating, metal extraction, production of chemicals. 10. One of the metals most difficult to oxidize is ..... A) Potassium. B) Calcium. C) Copper. D) Sodium. Show Answer Correct Answer: C) Copper. 11. The weight of silver(At.wt= 108) displaced by a quantity of electricity which displaces 5600 mL of O$_{2}$ at STP will be A) 10.8 g. B) 5.4 g. C) 54.0 g. D) 108.0 g. Show Answer Correct Answer: D) 108.0 g. 12. When molten NaCl is electrolysed what has forms at the cathode? A) Hydrogen. B) Sodium. C) Chlorine. D) Oxygen. Show Answer Correct Answer: B) Sodium. 13. Al$^{3+}$ is reduced to Al(s) at an electrode surface. If a current of 25 amperes is maintained for 8.0 hours, what mass of aluminum is deposited on the electrode? Assume 100% current efficiency. A) 44 g. B) 2.5 g. C) 0.019 g. D) 67 g. Show Answer Correct Answer: D) 67 g. 14. During a science experiment, Harper and David were given two electrodes. Harper said the anode is the electrode where oxidation takes place, while David said it's the electrode where reduction takes place. Sophia, on the other hand, thought it's an aqueous solution containing an electrode or the salt bridge that connects half-cells. Who is correct? A) Harper is correct. B) David is correct. C) Sophia is correct. D) None of them are correct. Show Answer Correct Answer: A) Harper is correct. 15. Which is correct cell notationAnode:ZnCathode:Ni A) Zn$^{2+ }$(aq, 1M) / Zn (s) // Ni (s) / Ni$^{2+ }$(aq, 1M). B) Zn (s) /Zn$^{2+ }$(aq, 1M) // Ni$^{2+ }$(aq, 1M) / Ni (s). C) Zn$^{2+ }$(s, 1M) / Zn (aq) // Ni (aq) / Ni$^{2+ }$(s, 1M). D) Zn (aq) /Zn$^{2+ }$(s, 1M) // Ni$^{2+ }$(s, 1M) / Ni (aq). Show Answer Correct Answer: B) Zn (s) /Zn$^{2+ }$(aq, 1M) // Ni$^{2+ }$(aq, 1M) / Ni (s). 16. In a chemistry experiment, Nora and Noah are trying to identify an oxidizing agent. Which of the following best describes an oxidizing agent? A) It is the species that gets reduced gains electrons. B) It is the species that gets oxidized loses electrons. C) It is the species that creates electrons. D) It is the species that loses electrons. Show Answer Correct Answer: A) It is the species that gets reduced gains electrons. 17. Explain the function of a salt bridge in a galvanic cell. A) To prevent the flow of electrons. B) To act as a catalyst for the reaction. C) To increase the voltage of the cell. D) The function of a salt bridge in a galvanic cell is to maintain electrical neutrality and allow ion flow between the half-cells. Show Answer Correct Answer: D) The function of a salt bridge in a galvanic cell is to maintain electrical neutrality and allow ion flow between the half-cells. 18. Given the following half-reactions, Pb(s) + 2I$^{-}$(aq) $\rightarrow$ PbI$_{2}$(s) + 2e$^{-}$I$_{2}$(aq) + 2e$^{-}$ $\rightarrow$ 2I$^{-}$(aq)write the balanced overall reaction. A) 2Pb(s) + 4e$^{-}$ $\rightarrow$ 2PbI(s) + I$_{2}$(aq). B) Pb(s) + I$_{2}$(aq) $\rightarrow$ PbI$_{2}$(s). C) Pb(s) + I$_{2}$(aq) + 2e$^{-}$ $\rightarrow$ PbI (s) + I$^{-}$(aq). D) Pb(s) + Cl$_{2}$(aq) $\rightarrow$ Pb$^{2+}$(aq) + 2I$^{-}$(aq). Show Answer Correct Answer: B) Pb(s) + I$_{2}$(aq) $\rightarrow$ PbI$_{2}$(s). 19. Which statement is true for any electrochemical cell? A) Oxidation occurs at the anode, only. B) Reduction occurs at the anode, only. C) Oxidation occurs at both the anode and the cathode. D) Reduction occurs at both the anode and the cathode. Show Answer Correct Answer: A) Oxidation occurs at the anode, only. 20. Choose the correct cell representation of Na ion battery A) Na | Na$^{+}$, Na-MO2 | Electrolyte containing sodium salt | C. B) Na | Na$^{+}$, C | Electrolyte containing sodium salt | Na-MO2. C) Na$^{+}$ | Na, C | Electrolyte containing sodium salt | Na-MO2. D) Na$^{+}$ | Na, Na-MO2 | Electrolyte containing sodium salt | C. Show Answer Correct Answer: B) Na | Na$^{+}$, C | Electrolyte containing sodium salt | Na-MO2. 21. The standard cell potential ( $E^\circ_{\text{cell}}$ A) 1 M concentration, 1 atm pressure, and 25$^\circ$C. B) 0 M concentration, 1 atm pressure, and 0$^\circ$C. C) 1 M concentration, 0 atm pressure, and 0$^\circ$C. D) 0 M concentration, 0 atm pressure, and 25$^\circ$C. Show Answer Correct Answer: A) 1 M concentration, 1 atm pressure, and 25$^\circ$C. 22. The driving force behind the electron transfer is called the cell potential (Voltage). A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 23. What is the quantity of electricity in Faraday required to Reduce 1 mole of MnO$_{4}$$^{-}$ to Mn$^{2+}$. A) 8. B) 4. C) 5. D) 6. Show Answer Correct Answer: C) 5. 24. The standard redox potentials for the reactions Mn$^{2+}$+2e$\rightarrow$Mn and Mn$^{3+}$+e$\rightarrow$Mn2+ are-1.18V and 1.51V respectively. What is the redox potential for the reaction Mn$^{3+}$+3e$\rightarrow$Mn? A) -.85 V. B) -0.28 V. C) 1.69V. D) .33 V. Show Answer Correct Answer: B) -0.28 V. 25. Which of the following is not a secondary battery A) Mercury cell. B) Lead acid cell. C) Li ion battery. D) Ni-MH cell. Show Answer Correct Answer: A) Mercury cell. 26. What is the oxidation state of nitrogen in the compound NH$_{4}$Br? A) 4. B) +2. C) -1. D) -3. Show Answer Correct Answer: D) -3. 27. For redox reaction to proceed in a cell, the e.m.f. must be A) Negative. B) Zero. C) Fixed. D) Positive. Show Answer Correct Answer: D) Positive. 28. The specific conductivity of 0.20M solutionof KCl at 298 K is 0.0248 S/cm. Calculate itsmolar conductivity. A) 148 Scm$^{2}$mol$^{-1}$. B) 136 Scm$^{2}$mol$^{-1}$. C) 112 Scm$^{2}$mol$^{-1}$. D) $^{ }$124 Scm$^{2}$mol$^{-1}$. Show Answer Correct Answer: D) $^{ }$124 Scm$^{2}$mol$^{-1}$. 29. What is the main cause of corrosion in metals? A) Mechanical stress. B) Exposure to high temperatures. C) Chemical reactions with environmental substances. D) Exposure to ultraviolet light. Show Answer Correct Answer: C) Chemical reactions with environmental substances. 30. Hydrogen electrode is placed in the solution whose pH is 10. The potential of this electrode will be A) 0.591V. B) -0.591V. C) 0. D) None of these. Show Answer Correct Answer: B) -0.591V. 31. It is referred as the study of the interchange of chemical and electrical energy. A) Electrochemistry. B) Electrochemical energy. C) Redox reaction. D) Electricity. E) Electrolysis. Show Answer Correct Answer: A) Electrochemistry. 32. The cell potential of a spontaneous reaction is A) Positive. B) Negative. C) All the above. D) None of the above. Show Answer Correct Answer: A) Positive. 33. Cell constant is A) L/a. B) A/l. C) Axl. D) None. Show Answer Correct Answer: A) L/a. 34. In a Galvanic Cell, the salt bridge ..... A) Completes the circuit so that electrons can flow through the wire. B) Maintains charge balance. C) Is soaked in an unreactive electrolyte such as KNO$_{3}$. D) All of the above. Show Answer Correct Answer: D) All of the above. 35. Oxidation is the loss of electrons from some chemical species. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 36. The covering of a thin layer of metal is A) Electromachining. B) Electrowinning. C) Electroplating. D) Electrorefining. Show Answer Correct Answer: C) Electroplating. 37. Species passing in the salt bridge A) Cation. B) Anion. C) Cation and anion. D) Electrons. Show Answer Correct Answer: C) Cation and anion. 38. Ethan is observing a chemical reaction in his science class that involves the transfer of electrons. A) Electrochemistry. B) Anode. C) Redox Reactions. D) Electrolysis. Show Answer Correct Answer: C) Redox Reactions. 39. What is the oxidation number of N in NO$_{2}$$^{-}$?$_{}$ A) +3. B) -3. C) -2. D) +4. Show Answer Correct Answer: A) +3. 40. Calculate emf of the following cell at 25$^\circ$C:Fe | Fe$^{2+}$ (0.001 M) || H$^{+}$ (0.01 M) | H$_{2}$(g) (1 bar) | Pt(s)E$^\circ$$_{(Fe2+ | Fe)}$ =-0.44 V, E$^\circ$$_{(H+ | H2)}$ = 0.00V A) E $_{cell}$ = 0.4105 Volts. B) E $_{cell}$ = 0.2105 Volts. C) E $_{cell}$ = 0.5105 Volts. D) E $_{cell}$ = 0.4605 Volts. Show Answer Correct Answer: A) E $_{cell}$ = 0.4105 Volts. 41. A species with relatively large positive reduction potential are strong (a) agents. A) A. oxidizing. B) Reducing. C) All the above. D) None of the above. Show Answer Correct Answer: A) A. oxidizing. 42. Which of the following is the chemical formula of rust. A) FeO.xH$_{2}$O. B) Fe$_{2}$O$_{3}$. C) Fe$_{2}$O$_{3}$.xH$_{2}$O. D) Fe$_{3}$O$_{4}$.xH$_{2}$O. Show Answer Correct Answer: C) Fe$_{2}$O$_{3}$.xH$_{2}$O. 43. Cell constant is generally found by measuring the conductivity of aqueous solution of A) KNO3. B) KCl. C) BaCl2. D) NaCl. Show Answer Correct Answer: B) KCl. 44. Which statement correctly describes the two electrodes in an electrolytic cell? A) The anode is negative and the cathode is positive. B) The anode and cathode are both positive. C) The anode is positive and the cathode is negative. D) The anode and cathode are both negative. Show Answer Correct Answer: C) The anode is positive and the cathode is negative. 45. An example of primary cell is ..... A) Lithium. B) Eveready. C) Ni-CAD. D) Lead acid. Show Answer Correct Answer: B) Eveready. 46. Same quantity of electricity was passed through solutions of salts of elements A, B and C with atomic weights 7, 27 and 48 respectively. The masses of A, B and C deposited were 2.1 g, 27.7g and 7.2 respectively. The valencies of A, B and C A) 1, 3, 2. B) 1, 2, 3. C) 2, 3, 2. D) 3, 2, 1. Show Answer Correct Answer: A) 1, 3, 2. 47. What is the value of the cell constant when the conductance of an electrolytic solution is equal to its conductivity? A) 10. B) 1. C) 100. D) 0. Show Answer Correct Answer: B) 1. 48. What will happen during the electrolysis of aqueous solution of CuSO$_{4 }$in the presence of Cu electrodes? A) Oxygen will be released at cathode. B) Copper will deposit at anode. C) Copper will deposit at the cathode. D) H $_{2}$ will be released at anode. Show Answer Correct Answer: C) Copper will deposit at the cathode. 49. With dilution which of the following decreases A) Resistance. B) Specific Conductance. C) Equivalent Conductance. D) Molar Conductance. Show Answer Correct Answer: B) Specific Conductance. 50. Electric current flow is caused by a ..... between the electrodes. A) Resistance. B) Ions. C) Potential difference. D) Electrodes. Show Answer Correct Answer: C) Potential difference. 51. In an electrochemical cell, electrons travel in which direction? A) From the cathode to the anode through the porous cup. B) From the anode to the cathode through the external circuit. C) From the cathode to the anode through the external circuit. D) From the anode to the cathode through the porous cup. Show Answer Correct Answer: B) From the anode to the cathode through the external circuit. 52. Question 6In a survival situation, which type of cell would help you the most? A) Electrolytic cell-because it uses electricity to start a reaction. B) Chemical cell-because it can generate electricity without external power. C) Chemical cell-because it produces food during reaction. D) None of the above. Show Answer Correct Answer: B) Chemical cell-because it can generate electricity without external power. 53. Saturated solution of potassium nitrate is used to make salt bridge because A) Velocity of K+ ion is greater than nitrate ion. B) Velocity of nitrate ion is more than K+ ion. C) Velocity of both the ions nearby same. D) None of these. Show Answer Correct Answer: C) Velocity of both the ions nearby same. 54. What is a disadvantage of a rechargeable cell when compared to an primary cell? A) It is smaller. B) It costs more to manufacture. C) It can be reused many times. D) None of the above. Show Answer Correct Answer: C) It can be reused many times. 55. To electroplate an object with silver it would have to be the ..... and have a ..... charge. A) Cathode, positive. B) Anode, negative. C) Anode, positive. D) Cathode, negative. Show Answer Correct Answer: C) Anode, positive. 56. Which of the following best describes an electrochemical series? A) A list of metals arranged by their atomic mass. B) A table of chemical reactions. C) A list of half-reactions ordered by their standard electrode potentials. D) A series of electrolytic cells. Show Answer Correct Answer: C) A list of half-reactions ordered by their standard electrode potentials. 57. An acidic solution contains H$^{+}$ ions and H$_{2}$O-. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 58. Electrolysis of copper(ii) sulphate solution produced colourless bubble gas. What is it ..... ? A) Hydroxide gas. B) Nitrogen gas. C) Oxygen gas. D) Hydrogen gas. Show Answer Correct Answer: C) Oxygen gas. 59. The negatively charged ions migrate toward the ..... A) Anode. B) Cathode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Anode. 60. E$^{O}$ represents A) Single electrode potential. B) Standard electrode potential. C) Standard hydrogen electrode. D) None. Show Answer Correct Answer: B) Standard electrode potential. ← PreviousNext →Related QuizzesScience QuizzesClass 12 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 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books