This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If the concentration of Cu2+ ions is 0.1 M and Cu(s) is at 1 atm, calculate the cell potential for the given reaction. A) 0.18 V. B) 0.42 V. C) 0.25 V. D) 0.34 V. Show Answer Correct Answer: D) 0.34 V. 2. In a process called flash electroplating, a current of 2.90 x 10$^{3}$ A passes through an electrolytic cell for 8.00 minutes. How many moles of electrons are driven through the cell? (use 96, 485 C) A) -14.4272 mol e-. B) 14.4272 mol e-. C) 14.4271 mol e-. D) -14.4271 mol e-. Show Answer Correct Answer: C) 14.4271 mol e-. 3. The electrode potential measures A) Tendency of cell reaction to occur. B) Current carried by an electrode. C) Tendency of an electrode to gain or lose electron. D) Difference in ionization of electrode and metal ion. Show Answer Correct Answer: C) Tendency of an electrode to gain or lose electron. 4. A redox is not a ..... A) Transfer of electrons from one element to another. B) Double Replacement Reaction. C) Single Replacement Reaction. D) An element that goes from a zero charge to a charged particle in a reaction. Show Answer Correct Answer: B) Double Replacement Reaction. 5. The anode is also known as the ..... half of the cell. A) Positive. B) Negative. C) Inactive. D) Neutral. Show Answer Correct Answer: B) Negative. 6. What is the unit of electrode potential? A) Amperes (A). B) Volts (V). C) Newtons (N). D) Joules (J). Show Answer Correct Answer: B) Volts (V). 7. For cell notation:Cd (s)/Cd$^{2+}$(aq) // Cu$^{2+}$(aq)/Cu(s) the voltage can be increased by A) Reducing [Cu$^{2+}$]. B) Reducing [Cd$^{2+}$]. C) Increasing [Cd$^{2+}$]. D) Reducing [Cu$^{2+}$] and [Cd$^{2+}$]. Show Answer Correct Answer: B) Reducing [Cd$^{2+}$]. 8. For SHE potential, concentration of the solution and pressure always be A) Unity. B) Zero. C) Half. D) None of the above. Show Answer Correct Answer: A) Unity. 9. In a galvanic cell, which direction do electrons flow? A) From anode to cathode. B) From negative to positive terminal. C) From positive to negative terminal. D) From cathode to anode. Show Answer Correct Answer: A) From anode to cathode. 10. During electroplating which metal covering is done on Fe A) Zn. B) Pb. C) Mg. D) Sn. Show Answer Correct Answer: D) Sn. 11. What is meant by invariant point? A) Number of phases is zero. B) Number of component is zero. C) Degree of freedom is zero. D) Non of the above. Show Answer Correct Answer: C) Degree of freedom is zero. 12. In the reaction:Fe + Cu$^{2+ }$ $\rightarrow$Fe$^{2+}$ + CuWhat species is oxidized? A) Cu$^{2+}$. B) Cu. C) Fe. D) Fe$^{2+}$. Show Answer Correct Answer: C) Fe. 13. What is the purpose of the salt bridge in an electrochemical cell? A) To increase the voltage. B) To allow the flow of electrons. C) To complete the circuit by allowing ion flow. D) To separate the two half-cells physically. Show Answer Correct Answer: C) To complete the circuit by allowing ion flow. 14. Define standard electrode potential. A) Standard electrode potential is the measure of the tendency of a half-cell to form covalent bonds. B) Standard electrode potential is the measure of the tendency of a half-cell to gain electrons and be oxidized. C) Standard electrode potential is the measure of the tendency of a half-cell to attract protons. D) Standard electrode potential is the measure of the tendency of a half-cell to lose electrons and be reduced. Show Answer Correct Answer: D) Standard electrode potential is the measure of the tendency of a half-cell to lose electrons and be reduced. 15. Electrolytic cell is based on a spontaneous reaction. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 16. What is the oxidation state of sulfur in sulfuric acid (H$_{2}$SO$_{4}$)? A) +6. B) -2. C) +4. D) 0. Show Answer Correct Answer: A) +6. 17. Calculate the standard cell potential.3Mg + 2Al$^{3+}$ $\rightarrow$ 2Al + 3Mg$^{2+}$ A) +0.71 V. B) -0.71 V. C) All the above. D) None of the above. Show Answer Correct Answer: A) +0.71 V. 18. The oxidation state of a species undergoing oxidation decreases A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 19. In a chemistry class, Lily and Aiden were discussing a chemical reaction. Lily said that oxidation is happening in the reaction. What did she mean by oxidation? A) It is the creation of electrons. B) It is the destruction of electrons. C) It is the loss of electrons. D) It is the gain of electrons. Show Answer Correct Answer: C) It is the loss of electrons. 20. Which component in a galvanic cell prevents the reaction from reaching equilibrium instantly? A) Cathode. B) Anode. C) Electrolyte. D) Salt bridge. Show Answer Correct Answer: D) Salt bridge. 21. 16H+ + 5Fe + 2Mn04-$\rightarrow$ 5Fe2+ + 2Mn2+ + 8H2OWHICH IS OXIDISED? A) Fe. B) MnO4-. C) Mn2+. D) Fe2+. Show Answer Correct Answer: A) Fe. 22. In a galvanic cell the electrode at which the electrons released is called ..... and the change that occurs at this electrode is called ..... A) Anode, reduction. B) Cathode, oxidation. C) Anode, Oxidation. D) Cathode, Reduction. Show Answer Correct Answer: C) Anode, Oxidation. 23. Saturated solution of KNO3 is used to make 'salt bridge' because [IIT JEE 2001] A) Velocity of K+ is greater than that of NO3-. B) Velocity of NO3-is greater than that of K+. C) Velocity of both K+ and NO3-are nearly the same. D) KNO3 is highly soluble in water. Show Answer Correct Answer: C) Velocity of both K+ and NO3-are nearly the same. 24. The conductivity of 0.2M KCl solution is 0.00248 S cm$^{-1}$. what is the molar conductivity of the solution. A) 124 X 10$^{-4}$S cm$^{2}$ mol$^{-1}$. B) 124 S cm$^{2}$ mol$^{-1}$. C) 1.24 S m$^{2}$ mol$^{-1}$. D) 124 S m$^{2}$ mol$^{-1}$. Show Answer Correct Answer: B) 124 S cm$^{2}$ mol$^{-1}$. 25. What is the relationship between the Nernst equation and the Gibbs free energy change? A) The Nernst equation directly measures Gibbs free energy. B) The Nernst equation is unrelated to Gibbs free energy. C) The Nernst equation can be derived from the Gibbs free energy change. D) The Nernst equation is used to calculate Gibbs free energy. Show Answer Correct Answer: C) The Nernst equation can be derived from the Gibbs free energy change. 26. Charge of cathode in eletrolytic cell A) +. B) -. C) 0. D) None of the above. Show Answer Correct Answer: B) -. 27. N$_{c}$ + n$_{a}$ = A) Less than 1. B) More than 1. C) Equal to 1. D) None. Show Answer Correct Answer: C) Equal to 1. 28. In electrochemical cell anode is A) Positive. B) Negative. C) Neutral. D) None. Show Answer Correct Answer: B) Negative. 29. A galvanic cell was set up using the Cu$^{2+}$/Cu and Fe$^{3+}$/Fe$^{2+}$ half-cells. The standard reduction potentials for these half-cells are:Cu$^{2+}$(aq) + 2e$^{-}$ $\rightarrow$ Cu(s); E$^{0}$ = 0.34 V Fe$^{3+}$(aq) + e$^{-}$ $\rightarrow$ Fe$^{2+}$(aq); E$^{0}$ = 0.77 V The oxidizing and reducing agents in this galvanic cell are, respectively: A) Cu$^{2+}$; Fe$^{2+}$. B) Cu$^{2+}$; Fe$^{3+}$. C) Fe$^{2+}$; Cu. D) Fe$^{3+}$; Cu. Show Answer Correct Answer: D) Fe$^{3+}$; Cu. 30. In a lemon battery, a different ..... occurs at each of the metal electrodes. A) Physical reaction. B) Reduction. C) Chemical reaction. D) Oxidation. Show Answer Correct Answer: C) Chemical reaction. 31. How much electricity in terms of faraday is required to produce 20 gm of calcium from calcium chloride A) 1 faraday. B) 2 faraday. C) 1.5 faraday. D) 3 faraday. Show Answer Correct Answer: A) 1 faraday. 32. An ion that has a POSITIVE charge A) Electron. B) Proton. C) Cation. D) Anion. Show Answer Correct Answer: C) Cation. 33. Which is reversible electrode among following? A) Calomel electrode. B) Zn-electrode. C) Cu-electrode. D) SHE. Show Answer Correct Answer: D) SHE. 34. Free energy is always available from reactions that are A) At equilibrium. B) Endothermic. C) Spontaneous. D) Non spontaneous. Show Answer Correct Answer: C) Spontaneous. 35. Which of the species strong oxidizing agent?Cl$_{2}$(g) + 2e $\rightarrow$ 2Cl$^{-}$(aq) E$^{o}$cell = + 1.36 V Cu$^{2+}$(aq) + 2e $\rightarrow$ Cu(s) E$^{o}$cell = + 0.34 V Ni$^{2+}$(aq) + 2e $\rightarrow$ Ni(s) E$^{o}$cell =-0.25 VCa$^{2+}$(aq) + 2e $\rightarrow$ Ca(s) E$^{o}$cell =-2.87 V A) Cu$^{2+}$(aq). B) Ni$^{2+}$(aq). C) Ca$^{2+}$(aq). D) Cl$_{2}$(g). Show Answer Correct Answer: D) Cl$_{2}$(g). 36. How does an electrolytic cell 's electricity established? A) An injected chemical reaction. B) A chemical reaction. C) It is pumped into the cell. D) It injects itself. Show Answer Correct Answer: C) It is pumped into the cell. 37. Per mole of reaction, how many moles of electrons are transferred in the reaction below?2Al$_{(s)}$ + 3Cu$^{2+}$$_{(aq)}$ $\rightarrow$ 2Al$^{3+}$$_{(aq)}$ + 3Cu$_{(s)}$ A) 4. B) 3. C) 2. D) 6. Show Answer Correct Answer: D) 6. 38. A salt bridge can be found in the electrolytic cell. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 39. In a Galvanic cell, the cations in the salt bridge ..... A) Flow the same way as the electrons flow in the wire. B) Flow the opposite way to the electron flow in the wire. C) Stay in the salt bridge. D) None of the above. Show Answer Correct Answer: A) Flow the same way as the electrons flow in the wire. 40. The general term for material where electrons can be lost or gained A) Electrode. B) Funion. C) Atom. D) Compound. Show Answer Correct Answer: A) Electrode. 41. The electrode where reduction occurs A) Cathode. B) Anion. C) Cation. D) Anode. Show Answer Correct Answer: A) Cathode. 42. Which cell is used for metal plating? A) Voltaic. B) Electrolytic. C) All the above. D) None of the above. Show Answer Correct Answer: B) Electrolytic. 43. What is the the electrode that contains the item to be electroplated? A) Anode. B) Cathode. C) All the above. D) None of the above. Show Answer Correct Answer: B) Cathode. 44. The charge of anode in the galvanic cell A) +. B) -. C) 0. D) None of the above. Show Answer Correct Answer: B) -. 45. TRUE/FALSEBy isolating a reaction in a half-cell it is not possible to calculate what is called a standard reduction potential. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 46. Which of the following is the strongest oxidising agent? A) $Cl_2$. B) $Br_2$. C) $I_2$. D) $F_2$. Show Answer Correct Answer: D) $F_2$. 47. A battery with no aqueous electrolyte solution is called a ..... A) Series battery. B) Oxidizer. C) Wet cell. D) Dry cell. Show Answer Correct Answer: D) Dry cell. 48. In the reaction:Fe + Cu$^{2+ }$ $\rightarrow$Fe$^{2+}$ + CuHow many electrons are gained? A) 2. B) 4. C) 6. D) 0. Show Answer Correct Answer: A) 2. 49. In a redox reaction how doe the number of electrons lost compare to the number of electrons gained? A) The number lost is always equal to the number gained. B) The number lost is sometimes equal to the number gained. C) The number lost is always greater than the number gained. D) The number lost is always less than the number gained. Show Answer Correct Answer: A) The number lost is always equal to the number gained. 50. Given the equation representing a reaction:Cd + NiO$_{2}$ + 2H$_{2}$O Cd(OH)$_{2}$ + Ni(OH)$_{2}$Which half-reaction equation represents the oxidation in the reaction? A) Ni$^{4+}$ + 2e$^{-}$ Ni$^{2+}$. B) Cd + 2e$^{-}$ Cd$^{2+}$. C) Cd Cd$^{2+}$ + 2e$^{-}$. D) Ni$^{4+}$ Ni$^{2+}$ + 2e$^{-}$. Show Answer Correct Answer: C) Cd Cd$^{2+}$ + 2e$^{-}$. 51. The positive value of the standard electrode potential of Cu+2/Cu indicates that A) This redox couple is a stronger reduction agent than the H/H2 couple. B) This redox couple is a stronger oxidizing agent than H+/H2. C) Cu cannot displace H2 from acid. D) None. Show Answer Correct Answer: B) This redox couple is a stronger oxidizing agent than H+/H2. 52. Describe the process of electrolysis and its applications. A) Electrolysis is primarily used for cooking food. B) Electrolysis is a method of painting surfaces. C) Electrolysis is used in various applications including electroplating, metal extraction, water splitting for hydrogen production, and the purification of metals. D) Electrolysis is only applicable in the textile industry. Show Answer Correct Answer: C) Electrolysis is used in various applications including electroplating, metal extraction, water splitting for hydrogen production, and the purification of metals. 53. Pt | MnO$_{4}$$^{-}$, Mn$^{2+}$ | | Zn$^{2+}$ | ZnFor the cell above, identify the cathode and anode. A) Cathode:ZnAnode:MnO$_{4}$$^{-}$. B) Cathode:ZnAnode:Pt. C) Cathode:MnO$_{4}$$^{-}$Anode:Zn. D) Cathode:PtAnode:Zn. Show Answer Correct Answer: B) Cathode:ZnAnode:Pt. 54. An anion is ..... charged ion. A) Positively. B) Neutrally. C) Negatively. D) None of the above. Show Answer Correct Answer: C) Negatively. 55. According to Ohm's Law, If to the ends of a conductor, a voltage 'E' is applied and a current 'I' flows through it, then the resistance 'R' A) E x I. B) I/E. C) E/I. D) None of the above. Show Answer Correct Answer: C) E/I. 56. According to Faraday's first law, the amount of substances produced or consumed at cathode or anode electrode is directly proportional to the A) Voltage provided. B) Quantity of electricity passed. C) Temperature of solution. D) Concentration of electrolyte. Show Answer Correct Answer: B) Quantity of electricity passed. 57. What is the difference between primary and secondary cells? A) Primary cells are rechargeable; secondary cells are non-rechargeable. B) Both primary and secondary cells are rechargeable. C) Primary cells can be reused; secondary cells cannot. D) Primary cells are non-rechargeable; secondary cells are rechargeable. Show Answer Correct Answer: D) Primary cells are non-rechargeable; secondary cells are rechargeable. 58. In the zinc-copper voltaic cell, electrons are produced at the ..... A) Cathode. B) Anode. C) All the above. D) None of the above. Show Answer Correct Answer: B) Anode. 59. It is the method that can be used for both qualitative and quantitative analysis of a wide variety of molecular and ionic materials. A) Potentiometry. B) Electrometry. C) Ammetry. D) Voltammetry. Show Answer Correct Answer: D) Voltammetry. 60. What is the role of a salt bridge in an electrochemical cell? A) To maintain electrical neutrality. B) To increase the cell potential. C) To provide a surface for the reaction. D) To act as a catalyst. Show Answer Correct Answer: A) To maintain electrical neutrality. 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