This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Al$^{3+}$(aq) + 3e$^{-}$$\rightarrow$Al(s) E$^\circ$ =-1.66 VAg$^{+}$(aq) + e$^{-}$$\rightarrow$Ag(s) E$^\circ$ = +0.80 VAccording to the standard reduction potentials given above, what is the standard cell potential for the reaction represented below?3Ag$^{+}$(aq) + Al(s) $\rightarrow$3Ag(s) + Al$^{3+}$(aq) A) 0.46 V. B) 2.46 V. C) 3.66 V. D) 1.20 V. Show Answer Correct Answer: B) 2.46 V. 2. In electrochemical series, negative electrode potential values are placed at A) Bottom. B) Top. C) Right. D) None. Show Answer Correct Answer: B) Top. 3. Explain the significance of the cathode in electrochemical reactions. A) The cathode is significant as it is the site of reduction in electrochemical reactions, enabling electron transfer and driving the reaction. B) The cathode does not play a role in electron transfer during reactions. C) The cathode is the source of ions in electrochemical cells. D) The cathode is where oxidation occurs in electrochemical reactions. Show Answer Correct Answer: A) The cathode is significant as it is the site of reduction in electrochemical reactions, enabling electron transfer and driving the reaction. 4. What is the oxidation number of chromium in the chromate ion, CrO$_{4}$$^{2-}$? A) 2. B) 6. C) 3. D) 8. Show Answer Correct Answer: B) 6. 5. One type of experimental battery for electric cars uses the active metal ..... A) Potassium. B) Sodium. C) Lithium. D) Rubidium. Show Answer Correct Answer: C) Lithium. 6. The Resistance of a conductor is directly proportional to A) Length. B) Height. C) Width. D) Area of cross section. Show Answer Correct Answer: D) Area of cross section. 7. Which of the following is true about the Nernst equation at equilibrium? A) The cell potential is zero. B) The cell potential is at its maximum. C) The cell potential is equal to the standard cell potential. D) The cell potential is negative. Show Answer Correct Answer: A) The cell potential is zero. 8. Which ion can be most easily oxidized A) Copper +2. B) Iron +2. C) Zinc +2. D) Calcium +2. Show Answer Correct Answer: D) Calcium +2. 9. This provides a path for ions to travel in an electrochemical cell A) Carbon tunnel. B) Sugar bridge. C) Copper bridge. D) Salt bridge. Show Answer Correct Answer: D) Salt bridge. 10. They are two types of reaction are possible in SHE depends on ..... we take A) Electrolyte. B) Metal. C) Potential. D) None of the above. Show Answer Correct Answer: B) Metal. 11. How does the concentration of electrolytes affect the cell potential? A) Higher concentrations of electrolytes can increase the cell potential. B) The concentration of electrolytes has an inverse relationship with cell potential. C) Higher concentrations of electrolytes decrease the cell potential. D) Lower concentrations of electrolytes have no effect on cell potential. Show Answer Correct Answer: A) Higher concentrations of electrolytes can increase the cell potential. 12. In electrolytic cell, anode will attract ..... A) Cations. B) Anions. C) All the above. D) None of the above. Show Answer Correct Answer: B) Anions. 13. In addition to a fuel, what other chemical is needed by a fuel cell? A) Nitrogen. B) Oxygen. C) Methane. D) None of the above. Show Answer Correct Answer: B) Oxygen. 14. Which of the following is not the unit of conductance A) $\frac{1}{ohm}$. B) Ohm. C) Mho. D) Siemens. Show Answer Correct Answer: A) $\frac{1}{ohm}$. 15. What is The relationship between Z &E A) Inversely proportional. B) No relation. C) Directly proportional. D) A) & C) both. Show Answer Correct Answer: C) Directly proportional. 16. An aqueous solution of zinc sulphate is electrolysed between zinc electrodes. Which of the following will not affect the mass of zinc deposited. A) Amount of current. B) Duration of electrolysis. C) Type of electrodes. D) Concentration of zinc sulphate. Show Answer Correct Answer: D) Concentration of zinc sulphate. 17. What would be the theoretical cell potential of the previous electrochemical cell?Ag$^{+}$/Ag = 0.80VNi$^{2+}$/Ni =-0.25V A) -0.55V. B) 0.55V. C) 1.05V. D) -1.05V. Show Answer Correct Answer: C) 1.05V. 18. An oxidizing agent will A) Be reduced. B) Increase in oxidation number. C) Lose electrons. D) Increase in mass. Show Answer Correct Answer: A) Be reduced. 19. When tin is over iron, it acts as an oxidizing agent and protects iron. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: B) FALSE. 20. Which type of equation can represent the oxidation occurring in a reaction? A) A half-reaction equation. B) A double-replacement reaction equation. C) A transmutation reaction equation. D) A neutralization reaction equation. Show Answer Correct Answer: A) A half-reaction equation. 21. An example of a strong electrolyte is: A) Ammonium hydroxide. B) Urea. C) Sodium hydroxide. D) Acetic acid. Show Answer Correct Answer: C) Sodium hydroxide. 22. William, David, and Rohan are on a thrilling adventure to create a circuit for their science project. They need to measure the electrical potential of their masterpiece. Which unit of measurement should they use to ensure their experiment's success? A) Amps. B) Volts. C) Ohms. D) Watts. Show Answer Correct Answer: B) Volts. 23. If Al is above Co in the activity series of metals, which of the following will occur if Al metal is put into a solution of cobalt nitrate? A) A redox reaction takes place. B) The Al strip dissolves. C) The Al strip becomes coated with cobalt. D) All of the above. Show Answer Correct Answer: D) All of the above. 24. A basic solution contains OH$^{-}$ ions and H$_{2}$O. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 25. Discuss the role of salt bridges in galvanic cells. A) Salt bridges are used to generate electrical charge in galvanic cells. B) Salt bridges prevent the flow of ions between the half-cells. C) Salt bridges are only necessary for certain types of galvanic cells. D) Salt bridges maintain electrical neutrality and allow the flow of ions between the half-cells. Show Answer Correct Answer: D) Salt bridges maintain electrical neutrality and allow the flow of ions between the half-cells. 26. What are the ions present in water? A) H and OH. B) H+ and OH-. C) H2 and O. D) H2O. Show Answer Correct Answer: B) H+ and OH-. 27. In the reaction:Fe + Cu$^{2+ }$ $\rightarrow$Fe$^{2+}$ + CuWhat is the oxidant? A) Fe$^{2+}$. B) Fe. C) Cu$^{2+}$. D) Cu. Show Answer Correct Answer: A) Fe$^{2+}$. 28. If a copper sample containing some zinc impurity is to be purified by electrolysis, the anode and the cathode must be which of the following? A) Pure zinc anode & pure copper cathode. B) Pure copper anode & impure copper cathode. C) Impure copper anode & pure copper cathode. D) Pure copper anode & pure zinc cathode. Show Answer Correct Answer: C) Impure copper anode & pure copper cathode. 29. In a voltaic cell, the half cell that receives cations from the salt bridge is A) Cathode. B) Anode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Cathode. 30. Antara berikut, yang manakah elektrolit? A) Larutan asid nitrik cair. B) Leburan naftalena. C) Kuprum. D) Larutan glukosa. Show Answer Correct Answer: A) Larutan asid nitrik cair. 31. What is the significance of the $n$ A) It represents the number of moles of electrons transferred. B) It is unrelated to the reaction. C) It shows the number of moles of products. D) It indicates the number of moles of reactants. Show Answer Correct Answer: A) It represents the number of moles of electrons transferred. 32. If the two half-cells, X$^{2+}$/X, E$^{o}$ =-0.44V and Y$^{2+}$/Y, E$^{0}$ =-0.76V are connected, the E$^{0}$$_{cell}$ is A) -1.20 V. B) -0.32 V. C) +0.32 V. D) +1.20 V. Show Answer Correct Answer: C) +0.32 V. 33. Which of the following electrolyte produces hydrogen gas and oxygen gas during electrolysis using carbon compounds?Antara electrolit berikut, yang manakah akan menghasilkan gas hydrogen dan gas oksigen semasa elektrolisis menggunakan elektrod karbon? A) Sodium chloride solutionLarutan natrium klorida. B) Magnesium sulphate solutionLarutan magnesium sulfat. C) Copper(II) sulphate solutionLarutan kuprum(II) sulfat. D) Zinc iodide solutionLarutan zink iodida. Show Answer Correct Answer: A) Sodium chloride solutionLarutan natrium klorida. 34. The electrode connected to the positive terminal of a battery is ..... A) Cathode. B) Anode. C) All the above. D) None of the above. Show Answer Correct Answer: B) Anode. 35. Galvanised iron sheet are coated with A) C. B) Cu. C) Ni. D) Zn. Show Answer Correct Answer: D) Zn. 36. Which of the following statements concerning galvanic cells is/are true? A) The two half-cells are connected by a salt bridge. B) Electrons flow from the anode to the cathode. C) Reduction occurs at the cathode. D) All of the above are true. Show Answer Correct Answer: D) All of the above are true. 37. The potential of SHE is A) 0.00V. B) 0.1V. C) 0.01V. D) None. Show Answer Correct Answer: A) 0.00V. 38. Gibbs phase rule for general system: A) F =C-P+2. B) P+F=C-2. C) P+F=C-1. D) P+F=C+1. Show Answer Correct Answer: A) F =C-P+2. 39. The process in which electrical energy is used to bring about a chemical change A) Fuel cell. B) Voltaic cell. C) Battery. D) Electrolysis. Show Answer Correct Answer: D) Electrolysis. 40. When 1.0 mole of ZnO(s) decomposes, the $\Delta H$ A) The formation of ZnO is endothermic. B) The formation of ZnO does not require energy. C) The formation of ZnO is exothermic. D) None of the above. Show Answer Correct Answer: C) The formation of ZnO is exothermic. 41. The group of elements in which the electron enters the antipenultimate shell is called A) P block. B) F block. C) S block. D) D block. Show Answer Correct Answer: B) F block. 42. Which of the following is NOT equal to 1 Faraday? A) 96500C. B) 1 mole of electron. C) One second. D) None of the above. Show Answer Correct Answer: C) One second. 43. Define redox reaction and give an example related to electrochemistry. A) The synthesis of ammonia from nitrogen and hydrogen. B) In the context of electrochemistry, an example of a redox reaction is the oxidation of zinc and the reduction of copper in a galvanic cell, such as the Daniell cell. C) The combustion of methane gas. D) The reaction of sodium chloride with water. Show Answer Correct Answer: B) In the context of electrochemistry, an example of a redox reaction is the oxidation of zinc and the reduction of copper in a galvanic cell, such as the Daniell cell. 44. Which of the following best describes the Nernst equation's application in biological systems? A) It is used to measure blood pressure. B) It helps in understanding nerve impulse transmission. C) It is unrelated to biological systems. D) It measures the concentration of glucose in blood. Show Answer Correct Answer: B) It helps in understanding nerve impulse transmission. 45. Which is not an advantage for using a hydrogen-oxygen fuel cell in a space station? A) No moving parts. B) Small and compact size. C) They generate useful heat for warmth. D) None of the above. Show Answer Correct Answer: C) They generate useful heat for warmth. 46. Write a balanced net ionic equation for the overall reaction represented by the cell notation below.Ag | AgI | I$^{-}$ || Fe$^{2+}$, Fe$^{3+}$ | Pt A) Fe$^{3+}$(aq) + Ag(s) + I$^{-}$(aq) $\rightarrow$ Fe$^{2+}$(aq) + AgI(s). B) Fe$^{2+}$(aq) + Ag(s) + I$^{-}$(aq) $\rightarrow$ Fe$^{3+}$(aq) + AgI(s). C) Fe$^{2+}$(aq) + AgI(s) $\rightarrow$ Fe$^{3+}$(aq) + Ag(s) + I$^{-}$(aq). D) Fe$^{3+}$(aq) + 2I$^{-}$(aq) $\rightarrow$ Fe$^{2+}$(aq) + I$_{2}$(s). Show Answer Correct Answer: A) Fe$^{3+}$(aq) + Ag(s) + I$^{-}$(aq) $\rightarrow$ Fe$^{2+}$(aq) + AgI(s). 47. Nora is conducting an experiment in her chemistry class where she uses chemical energy to drive a non-spontaneous chemical reaction. What is this process called? A) Electrolysis. B) Redox Reactions. C) Electrochemistry. D) Anode. Show Answer Correct Answer: A) Electrolysis. 48. Which of the following elements does NOT have an oxidation number of +2? A) K. B) Sr. C) Ba. D) Ca. Show Answer Correct Answer: A) K. 49. In the following half equation, which particle undergoes oxidation?2 I$^{-}$ $\rightarrow$ I$_{2}$ + 2e A) I$^{-}$. B) I$_{2}$. C) All the above. D) None of the above. Show Answer Correct Answer: A) I$^{-}$. 50. Cathode is the electrode where A) Electrons are released. B) Reduction occurs. C) Oxidation occurs. D) No reaction occurs. Show Answer Correct Answer: B) Reduction occurs. 51. The process of gaining electrons A) Reduction. B) Oxidation. C) Electrolysis. D) Anion. Show Answer Correct Answer: A) Reduction. 52. A spontaneous electrochemical reaction that produces electricity A) Jail cell. B) Reduced cell. C) Electrolytic cell. D) Electrochemical cell. Show Answer Correct Answer: D) Electrochemical cell. 53. Separate equations that show how electrons are lost and gained A) Exothermic. B) Half reactions. C) Endothermic. D) Double reactions. Show Answer Correct Answer: B) Half reactions. 54. Applications of Kohlrausch's law A) Determination of Dissociation constant. B) Degree of dissociation. C) Solubility of sparingly soluble salts. D) All the above. Show Answer Correct Answer: D) All the above. 55. The cell constant of a conductivity cell A) Remains constant for a cell. B) Changes with change of electrolyte. C) Changes with temperature of electrolyte. D) Changes with change of concentration of electrolyte. Show Answer Correct Answer: A) Remains constant for a cell. 56. How does pH affect the electrochemical reactions? A) PH has no effect on electrochemical reactions. B) Higher pH always increases reaction rates. C) PH influences the concentration of ions, affecting reaction rates and equilibria in electrochemical processes. D) PH only affects solid-state reactions, not electrochemical ones. Show Answer Correct Answer: C) PH influences the concentration of ions, affecting reaction rates and equilibria in electrochemical processes. 57. Electrochemistry is A) The study of the relationship between sound and chemical reactions. B) The study of the relationship between magnetism and chemical reactions. C) The branch of chemistry that deals with the study of the relationship between electricity and chemical reactions. D) The study of the relationship between light and chemical reactions. Show Answer Correct Answer: C) The branch of chemistry that deals with the study of the relationship between electricity and chemical reactions. 58. In electrochemistry, the Nernst equation is used to calculate: A) The pH of a solution. B) The cell potential under non-standard conditions. C) The concentration of ions in a solution. D) The temperature of a reaction. Show Answer Correct Answer: B) The cell potential under non-standard conditions. 59. If in d-d transition electron absorb green colour radiation then the colour of radiation emited by it A) Orange. B) Yellow. C) Red. D) Voilet. Show Answer Correct Answer: C) Red. 60. Molar conductivity of ionic solution depends on A) Surface area of electrodes. B) Density of the solution. C) Concentration of electrolytes in solution. D) Distance between electrodes. Show Answer Correct Answer: C) Concentration of electrolytes in solution. ← 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 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