This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 7 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is the correct form of the Nernst equation? A) $E = E^0-\frac{nF}{RT} \ln Q$. B) $E = E^0 + \frac{nF}{RT} \ln Q$. C) $E = E^0-\frac{RT}{nF} \ln Q$. D) $E = E^0 + \frac{RT}{nF} \ln Q$. Show Answer Correct Answer: C) $E = E^0-\frac{RT}{nF} \ln Q$. 2. What is the oxidation state of oxygen in water ( $H_2O$ A) +2. B) -2. C) +1. D) 0. Show Answer Correct Answer: B) -2. 3. Which of the following is a half-reaction? A) $H_2O \rightarrow H_2 + \frac{1}{2}O_2$. B) $Zn \rightarrow Zn^{2+} + 2e^-$. C) $2H_2 + O_2 \rightarrow 2H_2O$. D) $NaCl \rightarrow Na^+ + Cl^-$. Show Answer Correct Answer: B) $Zn \rightarrow Zn^{2+} + 2e^-$. 4. The difference in the heat contents of the product and the reactants is called A) Temperature. B) Heat of reaction. C) Heat of calorimetry. D) None of the above. Show Answer Correct Answer: B) Heat of reaction. 5. Electrolyte used in Li ion battery is A) KOH. B) Ethylene Carbonate. C) LiPF$_{6}$. D) LiMO$_{2}$. Show Answer Correct Answer: C) LiPF$_{6}$. 6. What is the name of the negative electrode in an electrolytic cell? A) Cathode. B) Anode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Cathode. 7. The following reaction occurs spontaneously.2 Fe(s) + 3 Cl$_{2}$(aq) $\rightarrow$ 2 Fe$^{3+}$(aq) + 6 Cl$^{-}$(aq)Write the balanced reduction half-reaction A) Fe(s) $\rightarrow$ Fe$^{3+}$(aq) + e$^{-}$. B) Fe(s) + 3/2 Cl$_{2}$(aq) $\rightarrow$ FeCl$_{3}$(aq). C) Fe(s) + 3 e$^{-}$ $\rightarrow$ Fe$^{3+}$(aq). D) Cl$_{2}$(aq) + 2 e$^{-}$ $\rightarrow$ 2 Cl$^{-}$(aq). Show Answer Correct Answer: D) Cl$_{2}$(aq) + 2 e$^{-}$ $\rightarrow$ 2 Cl$^{-}$(aq). 8. When looking up enthalpy values for a set of reaction species, the enthalpy depends on the A) Physical state of the species. B) Color of species. C) Concentration of the species. D) None of the above. Show Answer Correct Answer: A) Physical state of the species. 9. EMF of a cell in terms of the reduction potential of its left and right electrode A) E = E$_{right}$-E$_{left}$. B) E = E$_{right}$ + E$_{left}$. C) E = E$_{left}$ + E$_{right}$. D) E = E$_{left}$-E$_{right}$. Show Answer Correct Answer: A) E = E$_{right}$-E$_{left}$. 10. Electroplating is an industrial process where objects are coated by a thin layer of a nonreactive metal by electrolysis. What should be used as the cathode in this process? A) Magnesium ribbon. B) Graphite electrode. C) The electroplating metal. D) The object to be electroplated. Show Answer Correct Answer: D) The object to be electroplated. 11. How does a galvanic cell generate electricity? A) The galvanic cell generates electricity by emitting light. B) Redox reactions at the anode and cathode release and accept electrons, respectively, generating an electric current. C) The galvanic cell generates electricity through mechanical rotation. D) The galvanic cell absorbs electricity from the environment. Show Answer Correct Answer: B) Redox reactions at the anode and cathode release and accept electrons, respectively, generating an electric current. 12. Describe the components of a galvanic cell and their functions. A) Anode, cathode, electrolyte, external circuit. B) Electrolyte, wire, insulator, semiconductor. C) Anode, cathode, voltmeter, resistor. D) Cathode, anode, proton, neutron. Show Answer Correct Answer: A) Anode, cathode, electrolyte, external circuit. 13. The conductivity of electrolytic conductors is due to A) Movement of ions. B) Either movement of electrons or ions. C) Flow of free mobile electrons. D) Cannot be said. Show Answer Correct Answer: A) Movement of ions. 14. In half cell, metal is dipped in to a solution of its ..... salt A) Mohr's. B) Common. C) Own. D) Rock salt. Show Answer Correct Answer: C) Own. 15. Which metal reacts spontaneously with Sr$^{2+}$ ions? A) Ca. B) Cs. C) Co. D) Cu. Show Answer Correct Answer: B) Cs. 16. Question 2 Can an electrolytic cell create energy like a chemical cell? A) No-electrolytic cells require electricity to work. B) Yes-both cells naturally produce electricity. C) No-chemical cells only work in laboratories. D) None of the above. Show Answer Correct Answer: A) No-electrolytic cells require electricity to work. 17. For a cell given below Ag | Ag$^{+}$ || Cu$^{2+}$ | Cu-Ag$^{+}$ + e$^{-}$ Ag, E$^\circ$ = xCu$^{2+}$ + 2e$^{-}$ Cu, E$^\circ$ = y, E$^\circ$ cell is-(A) (B) (C) (D) A) 2x + y. B) Y-2x. C) X + 2y. D) Y-x. Show Answer Correct Answer: D) Y-x. 18. Reduction electrode is: A) Cathode. B) Anode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Cathode. 19. Given their standard reduction potentials, which of the species is going to be oxidized?Cu$^{2+}$/Cu = 0.34VZn$^{2+}$/Zn =-0.76V A) CuSO4. B) ZnSO4. C) Zn. D) Cu. Show Answer Correct Answer: C) Zn. 20. Which of the following statements is correct with respect to electrolytic solutions? A) Its conductivity increases with dilution. B) Its conductance increases with dilution. C) Its equivalent conductance decreases with dilution. D) Its conductance decreases with dilution. Show Answer Correct Answer: B) Its conductance increases with dilution. 21. In electrochemical cell Anode is of which charge A) -ve. B) +ve. C) No charge. D) Both charge. Show Answer Correct Answer: A) -ve. 22. Which statement is incorrect regarding H2-O2 fuel cell A) O2 gas introduced from cathode end. B) H2 gas introduced from anode end. C) Molten KOH is used as electrolyte. D) Water is end product of cell. Show Answer Correct Answer: C) Molten KOH is used as electrolyte. 23. For an electrolytic solution of 0.05 mol L$^{-1}$, the conductivity has been found to be 0.0110 Scm$^{1}$. The molar conductivity is- A) 0.055 S cm$^{2}$ mol$^{-1}$. B) 220 S cm$^{2}$ mol$^{-1}$. C) 0.22 S cm$^{2}$ mol$^{-1}$. D) 550 S cm$^{2}$ mol$^{-1}$. Show Answer Correct Answer: B) 220 S cm$^{2}$ mol$^{-1}$. 24. Ion conductance viscosity product is constant for all solvents including water in A) Picrate ions. B) Potassium ions. C) Silver ions. D) Sodium ions. Show Answer Correct Answer: A) Picrate ions. 25. When a magnesium wire is dipped into a solution of lead(II) nitrate, a black deposit forms on the wire. Which of the following can be concluded from this observation? A) The standard reduction potential, E$^\circ$ for Pb$^{2+}$(aq) is greater than that for Mg$^{2+}$(aq). B) Mg(s) is less easily oxidized than Pb(s). C) An external source of potential must have been supplied. D) The magnesium wire will be the cathode of a Mg/Pb cell. Show Answer Correct Answer: A) The standard reduction potential, E$^\circ$ for Pb$^{2+}$(aq) is greater than that for Mg$^{2+}$(aq). 26. The charge required for the reduction of 1 mol of MnO2-to MnO2 is A) 6F. B) 3F. C) 5F. D) 1F. Show Answer Correct Answer: B) 3F. 27. List two methods to prevent corrosion. A) 1. Apply protective coatings, 2. Use corrosion-resistant materials. B) Apply heat to metal surfaces. C) Expose metals to moisture. D) Use regular steel materials. Show Answer Correct Answer: A) 1. Apply protective coatings, 2. Use corrosion-resistant materials. 28. Which of the metals would be the anode in a battery with these two elements? A) Gold. B) Cadmium. C) Neither could serve as the anode. D) None of the above. Show Answer Correct Answer: B) Cadmium. 29. A salt bridge is used in ..... A) A Galvanic Cell. B) A Electrolytic Cell. C) Both Galvanic and Electrolytic cells. D) None of the above. Show Answer Correct Answer: A) A Galvanic Cell. 30. Faraday's laws of electrolysis will failwhen A) Temperature is increased. B) Inert electrodes are used. C) A mixture of electrolytes is used. D) None of these cases. Show Answer Correct Answer: D) None of these cases. 31. Which form of energy is converted to electrical energy in a voltaic cell? A) Nuclear. B) Mechanical. C) Thermal. D) Chemical. Show Answer Correct Answer: D) Chemical. 32. What is the Nernst equation used for? A) To calculate the mass of reactants in a reaction. B) To measure the pH of a solution. C) To determine the temperature of a chemical reaction. D) The Nernst equation is used to calculate the electric potential of an electrochemical cell based on ion concentrations. Show Answer Correct Answer: D) The Nernst equation is used to calculate the electric potential of an electrochemical cell based on ion concentrations. 33. Which of the following represents the reaction that occurs at the negative electrode in the above cell?Pb / Pb(NO$_{3}$)$_{2}$ (1.0 M) || AgNO$_{3}$ (1.0 M) / Ag A) Pb $\rightarrow$ Pb$^{2+}$ + 2 e$^{-}$. B) Ag$^{+}$ + e$^{-}$ $\rightarrow$ Ag. C) Pb$^{2+}$ + 2 e$^{-}$ $\rightarrow$ Pb. D) Ag $\rightarrow$ Ag$^{+}$ + e$^{-}$. Show Answer Correct Answer: A) Pb $\rightarrow$ Pb$^{2+}$ + 2 e$^{-}$. 34. How does the Nernst equation apply to redox reactions? A) It calculates the equilibrium constant. B) It determines the standard reduction potential. C) It predicts the direction of the redox reaction. D) It measures the rate of the redox reaction. Show Answer Correct Answer: C) It predicts the direction of the redox reaction. 35. A voltaic cell is made by combining two half-cells:solid cadmium with cadmium nitrate, and solid nickel(II) with nickel chloride. Which is the correct cell notation? A) Cd | Cd$^{2+ }$|| Ni$^{2+}$ | Ni. B) Cd$^{2+ }$| Cd || Ni | Ni$^{2+}$. C) Ni | Ni$^{2+}$ || Cd$^{2+ }$| Cd. D) Ni$^{2+}$ | Ni || Cd | Cd$^{2+}$. Show Answer Correct Answer: A) Cd | Cd$^{2+ }$|| Ni$^{2+}$ | Ni. 36. BF3 acts as an acid according to A) Arrhenius theory. B) Lowery bronsted. C) Lewis. D) All the above. Show Answer Correct Answer: C) Lewis. 37. Conductivity of an electrolytic solution depends on A) Distance between the electrodes. B) Concentration of electrolyte. C) Pressure. D) Power of AC source. Show Answer Correct Answer: B) Concentration of electrolyte. 38. What is the pH of the solution at the cathode if E =-0.362 V for the following electrochemical cell at 25$^\circ$C?Pt | H$_{2}$(1.0 atm) | H$^{+}$(1.00 M) || H$^{+}$(aq) | H$_{2}$(1.0 atm) | Pt A) 1.77. B) 3.06. C) 7.89. D) 6.11. Show Answer Correct Answer: D) 6.11. 39. Fuel cells ..... be recharged. A) Have to. B) Do not have to. C) All the above. D) None of the above. Show Answer Correct Answer: B) Do not have to. 40. The number of unpaired electron in Mn$^{3+}$, Cr$^{3+}$, and V$^{3+}$ are and respectively most stable ion is A) 4, 3 and 2 and V$^{3+}$ is most stable. B) 3, 3 and 2 and Cr$^{3+}$ is most stable. C) 4, 3 and 2 and Cr$^{3+}$ is most stable. D) 3, 3 and 2 and Mn$^{3+}$ is most stable. Show Answer Correct Answer: C) 4, 3 and 2 and Cr$^{3+}$ is most stable. 41. What is a galvanic cell? A) A type of battery that stores energy chemically due to electrical energy. B) A device used to measure electrical conductivity of an electrolyte. C) A tool for analyzing gas composition. D) A cell that converts chemical energy to electrical energy due to spontaneous redox reactions. Show Answer Correct Answer: D) A cell that converts chemical energy to electrical energy due to spontaneous redox reactions. 42. Define molar conductivity. A) Conducting power of all ions furnished by one mole of electrolyte at a particular volume of solution. B) Conductance of all ions furnished by one mole of electrolyte at a particular volume of solution. C) Resistivity of all ions furnished by one mole of electrolyte at a particular volume of solution. D) None of the above. Show Answer Correct Answer: A) Conducting power of all ions furnished by one mole of electrolyte at a particular volume of solution. 43. The resistance of 0.01N solution of an electrolyte AB at 328K is 100 ohm. The specific conductance of solution is (cell constant = 1cm$^{-1}$)- A) 10$^{2}$ ohm-cm. B) 10$^{-2}$ ohm$^{-1}$ cm$^{-1}$. C) 100 ohm. D) 10$^{-2}$ ohm$^{-1}$. Show Answer Correct Answer: B) 10$^{-2}$ ohm$^{-1}$ cm$^{-1}$. 44. Determine the values of equilibrium constant $\Delta$G$^\circ$ for the following reaction:Ni(s) + 2Ag$^{+}$ (aq) $\rightarrow$ Ni$^{2+}$ (aq) + 2Ag(s), E$^\circ$ = 1.05 V (1F=96500C) A) -202.65 Kj. B) 198.08KJ. C) -215.73Kj. D) 324.34KJ. Show Answer Correct Answer: A) -202.65 Kj. 45. This electrode in a voltaic cell loses mass A) Anode. B) Cathode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Anode. 46. What would be the theoretical cell potential of the electrochemical cell with the following species?Ag$^{+}$/Ag = 0.80VNi$^{2+}$/Ni =-0.25V A) +0.55V. B) -1.05V. C) -0.55V. D) +1.05V. Show Answer Correct Answer: D) +1.05V. 47. In commercial dry cell, the anode made by A) Carbon. B) Zinc. C) Lead. D) Platinum. Show Answer Correct Answer: B) Zinc. 48. Calculate the standard emf of the cell constructed with electrodes having E$^{o}$ values-0.44 V and-0.14V. A) 0.3V. B) 0.28V. C) 0.4V. D) 0.58V. Show Answer Correct Answer: A) 0.3V. 49. A particle with no charge A) Proton. B) Atom. C) Electron. D) Anion. Show Answer Correct Answer: B) Atom. 50. Samuel is working on a science project where he uses chemical energy to drive a chemical reaction in a cell. A) Redox Reactions. B) Electrochemistry. C) Electrochemical Cell. D) Anode. Show Answer Correct Answer: C) Electrochemical Cell. 51. The specific conductance (k) or conductivity of any conducting material is defined as the A) Reciprocal of current. B) Reciprocal of specific resistance. C) Reciprocal of resistance. D) Product of specific resistance and current. Show Answer Correct Answer: B) Reciprocal of specific resistance. 52. Which metal is used as a coating on steel to limit corrosion? A) Ca. B) K. C) Na. D) Zn. Show Answer Correct Answer: D) Zn. 53. Which of these is not likely to act as lewis base? A) BF3. B) F-. C) CO. D) PF3. Show Answer Correct Answer: A) BF3. 54. A voltaic cell consists of ..... half-cells. A) Two. B) Three. C) More than four. D) None of the above. Show Answer Correct Answer: A) Two. 55. What is a substance called that carries an electric charge? A) Electrolyte. B) Salt. C) Molecule. D) Solution. Show Answer Correct Answer: A) Electrolyte. 56. Lead acid storage battery is an example of A) Secondary cells. B) Electrolytic cells. C) Primary cells. D) Fuel cells. Show Answer Correct Answer: A) Secondary cells. 57. During galvanization, Fe metal is covered with A) Mg metal. B) Zn metal. C) Sn metal. D) Cu metal. Show Answer Correct Answer: B) Zn metal. 58. A voltaic cell has a standard potential of +0.31 V. What is the value of $\Delta$G under these conditions? A) More information is required. B) +29 kJ. C) -29 kJ. D) -15 kJ. Show Answer Correct Answer: A) More information is required. 59. Which of the following statements accurately describes the difference between galvanic and electrolytic cells? A) The anode is the negative terminal for a Galvanic cell because the anode is the source of the electrons where oxidation occurs. B) The flow of electrons goes from the anode to the cathode for galvanic cells. C) Oxidation occurs at the negative terminal, and reduction occurs at the positive terminal for an electrolytic cell. D) None of the above. Show Answer Correct Answer: A) The anode is the negative terminal for a Galvanic cell because the anode is the source of the electrons where oxidation occurs. 60. Which of the following ions has the maximum magnetic moment? A) Cr+2. B) Ti+2. C) Mn+2. D) Fe+2. Show Answer Correct Answer: C) Mn+2. ← 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 8Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books