This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 15 (52 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is an example of a spontaneous redox reaction? A) Charging a rechargeable battery. B) Electrolysis of water. C) The rusting of iron. D) Splitting water into hydrogen and oxygen gas. Show Answer Correct Answer: C) The rusting of iron. 2. What happens to an atom when it is oxidized? A) It gains protons. B) It gains electrons. C) It loses electrons. D) It loses neutrons. Show Answer Correct Answer: C) It loses electrons. 3. The oxidation number of chlorine in HClO4 A) +8. B) +7. C) +6. D) +5. Show Answer Correct Answer: B) +7. 4. How does electrolysis contribute to clean energy technologies? A) By splitting water into hydrogen and oxygen gases. B) By converting hydrogen into water. C) By converting carbon dioxide into oxygen. D) By converting oxygen into hydrogen. Show Answer Correct Answer: A) By splitting water into hydrogen and oxygen gases. 5. Using iron as a cathode to prevent corrosion A) Galvanization. B) Cathodic protection. C) Passivation. D) Coating. Show Answer Correct Answer: B) Cathodic protection. 6. The half-cells are connected by a ..... , which is a tube containing a strong electrolyte, often potassium sulfate A) Metallic wire. B) Salt bridge. C) Magnetic bridge. D) None of the above. Show Answer Correct Answer: B) Salt bridge. 7. Describe the components of an electrolytic cell. A) Electrodes, salt, power outlet, plastic tubing. B) Cathode, anode, water, light bulb. C) Cathode, anode, salt bridge, voltmeter. D) Electrodes, electrolyte solution, external power source, wires. Show Answer Correct Answer: D) Electrodes, electrolyte solution, external power source, wires. 8. Thickness of ionic atmosphere is represented as A) 1/K. B) N. C) K. D) 1/k. Show Answer Correct Answer: D) 1/k. 9. When aqueous ammonia is added to CuSO4 solution, the solution turns deep blue A) NH3 replaces H2O. B) H2O remains. C) NH3 remains. D) H2O replaces NH3. Show Answer Correct Answer: D) H2O replaces NH3. 10. Oxidation occurs at the A) Anode. B) Cathode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Anode. 11. The electronic configuration of Cu(II) is 3d$^{9}$ whereas that of Cu(I) is 3d$^{10}$. Which of the following is correct? A) Cu(II) is more stable in aqueous solution. B) Cu(II) is less stable in aqueous solution. C) Cu(I) and Cu(II) are equally stable. D) Stability of Cu(I) and Cu(II) depends on nature of copper salts. Show Answer Correct Answer: A) Cu(II) is more stable in aqueous solution. 12. Question 5Which cell do you think is more sustainable for future technology? A) Chemical cell-because it is renewable and uses clean fuel only. B) Electrolytic cell-because it is efficient in reversing chemical reactions. C) Chemical cell-because it is used in rechargeable battery technology. D) None of the above. Show Answer Correct Answer: C) Chemical cell-because it is used in rechargeable battery technology. 13. Reduction is the process of gaining electron. A) True. B) Flase. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 14. Which of the following is an example of electrolyte? A) Ethanol, C$_{2}$H$_{5}$OH. B) Naphthalene, C$_{10}$H$_{8}$. C) Acetamide, CH$_{3}$CONH$_{2}$. D) Copper(II) sulphate solution, CuSO$_{4}$. Show Answer Correct Answer: D) Copper(II) sulphate solution, CuSO$_{4}$. 15. How many electrons is needed to transform Fe$^{2+}$ ion to solid state? A) 4. B) 1. C) 3. D) 2. Show Answer Correct Answer: D) 2. 16. A cell reaction is spontaneous A) $\Delta$G$^\circ$ is positive. B) E$^\circ$ is positive. C) $\Delta$G$^\circ$ is negaitive. D) E$^\circ$ is negaitive. Show Answer Correct Answer: C) $\Delta$G$^\circ$ is negaitive. 17. The size of an electrical current depends on ..... potential difference A) Whether there is a. B) The size of the. C) The source of the. D) The direction of the. Show Answer Correct Answer: B) The size of the. 18. At 25$^{0}$ C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm$^{-1}$cm$^{2}$mol$^{-1}$ and at infinite dilution its molar conductance is 238 ohm$^{-1}$cm$^{2}$mol$^{-1}$. The degree of ionization of ammonium hydroxide at the same concentration and temperature is A) 4.008 %. B) 2.080 %. C) 20.800 %. D) 40.800 %. Show Answer Correct Answer: A) 4.008 %. 19. In home UPS and in all transportation vehicles, ..... battery is used. A) Lead acid. B) Primary. C) Lithium ion. D) Ni-CAD. Show Answer Correct Answer: A) Lead acid. 20. What is the oxidation number of carbon in H$_{2}$CO$_{3}$(aq)? A) 4-. B) 2-. C) 2+. D) 4+. Show Answer Correct Answer: D) 4+. 21. What is Faraday's law of electrolysis? A) The amount of substance produced during electrolysis is proportional to the electric charge passed. B) The amount of substance produced is independent of the electric charge. C) Electrolysis occurs only at high temperatures. D) The electric charge does not affect the rate of electrolysis. Show Answer Correct Answer: A) The amount of substance produced during electrolysis is proportional to the electric charge passed. 22. AlF$_{6}$ $^{3-}$ + 3 e$^{-}$ $\rightarrow$ Al + 6 F$^{-1}$Which of the following occurs in the reaction? A) Aluminum is converted from the-3 oxidation state to the 0 oxidation state. B) Al is oxidized at the anode. C) Aluminum is converted from the-3 oxidation state to the 0 oxidation state. D) AlF$_{6}$$^{3-}$ is reduced at the cathode. Show Answer Correct Answer: D) AlF$_{6}$$^{3-}$ is reduced at the cathode. 23. The salt bridge or porous plate ..... ions to pass from one half-cell to the other but prevents the solutions from mixing completely. A) Doesn't allow. B) Allows. C) All the above. D) None of the above. Show Answer Correct Answer: B) Allows. 24. The cell potential, E$^\circ$, for an oxidation-reduction reaction was found to equal 1.10 V. What can be saidabout this reaction? A) At equilibrium. B) Endothermic. C) Spontaneous. D) Nonspontaneous. Show Answer Correct Answer: C) Spontaneous. 25. Given the balanced ionic equation representing a reaction:Cu(s) + 2Ag$^{+}$(aq) $\rightarrow$ Cu$^{2+}$(aq) + 2Ag(s)During this reaction, electrons are transferred from A) Ag(s) to Cu$^{2+}$(aq). B) Cu(s) to Ag$^{+}$(aq). C) Ag$^{+}$(aq) to Cu(s). D) Cu$^{2+}$(aq) to Ag(s). Show Answer Correct Answer: B) Cu(s) to Ag$^{+}$(aq). 26. What is the oxidation state for a lead atom? A) 4+. B) 2+. C) 0. D) 2-. Show Answer Correct Answer: C) 0. 27. The molar conductivities are given as $\lambda$$^{0}$$_{m}$(H$_{2}$SO$_{4}$) = x S cm$^{2}$ mol$^{-1}$ $\lambda$$^{0}$$_{m}$(K$_{2}$SO$_{4}$) = y S cm$^{2}$ mol$^{-1}$$\lambda$$^{0}$$_{m}$(CH$_{3}$COOK) = z S cm$^{2}$ mol$^{-1}$$^{Molar conductance of }$$\lambda$$^{0}$$_{m}$(CH$_{3}$COOH) =? S cm$^{2}$ mol$^{-1}$ A) X-y + 2 z. B) X + y-z. C) X-y + z. D) (x-y)/2 + z. Show Answer Correct Answer: D) (x-y)/2 + z. 28. The cell which is used for electrolytic is A) Electrotic cell. B) Galvanic cell. C) Daniel cell. D) Voltaic cell. Show Answer Correct Answer: A) Electrotic cell. 29. The electrolyte composition in a cell affects its: A) Temperature. B) Shape. C) Color. D) Conductivity. Show Answer Correct Answer: D) Conductivity. 30. Which statement is correct about the Daniell cell? A) The spontaneous cell reaction involves the reduction of Cu2+ to Cu. B) The spontaneous cell reaction involves the reduction of Zn2+ to Zn. C) The Daniell cell is an example of an electrolytic cell. D) The spontaneous cell reaction involves the oxidation of Cu by Zn2+. Show Answer Correct Answer: A) The spontaneous cell reaction involves the reduction of Cu2+ to Cu. 31. Discuss the factors that affect the rate of redox reactions. A) Temperature, concentration of reactants, surface area of the reactants, and the presence of catalysts. B) Color of the reactants. C) Phase of the reactants. D) Time of day. Show Answer Correct Answer: A) Temperature, concentration of reactants, surface area of the reactants, and the presence of catalysts. 32. How do you calculate the cell potential of an electrochemical cell? A) ....cell = E$^\circ$ cell-(nF/RT) * ln(Q). B) ....cell = E$^\circ$ cell + (nF/RT) * ln(Q). C) ....cell = E$^\circ$ cell + (RT/nF) * ln(Q). D) ....cell = E$^\circ$ cell-(RT/nF) * ln(Q). Show Answer Correct Answer: D) ....cell = E$^\circ$ cell-(RT/nF) * ln(Q). 33. How many moles of mercury will be produced by electrolysing 1.0 M Hg(NO$_{3}$)$_{2}$ solution with a current of 2.00 A for 3 hours? [Hg(NO$_{3}$)$_{2}$ = 200.6 g mol$^{-1}$] A) .2020. B) .321. C) .0012. D) .1119. Show Answer Correct Answer: D) .1119. 34. Which of the following is a correct representation of a reduction half-reaction? A) $Cl_2 + 2e^-\rightarrow 2Cl^-$. B) $Na \rightarrow Na^+ + e^-$. C) $O_2 + 4e^-\rightarrow 2O^{2-}$. D) $Cu^{2+} + 2e^-\rightarrow Cu$. Show Answer Correct Answer: D) $Cu^{2+} + 2e^-\rightarrow Cu$. 35. Electrochemistry meals with A) Galvanic cells. B) Electrolytic cells. C) Both. D) None of these. Show Answer Correct Answer: C) Both. 36. An anode is ..... A) An electrode where reduction occurs. B) An element with a higher charge. C) Where reduction and oxidation. D) An electrode where oxidation occurs. Show Answer Correct Answer: D) An electrode where oxidation occurs. 37. In electrochemistry, what does the term 'oxidation' refer to? A) Loss of electrons. B) Gain of electrons. C) Change in state. D) Formation of compounds. Show Answer Correct Answer: A) Loss of electrons. 38. Which electrode is inert electrode. A) Carbon. B) Zinc. C) Iron. D) Copper. Show Answer Correct Answer: A) Carbon. 39. What occurs to the mass of copper electrode in the following reaction? A) Increases. B) Decreases. C) Remains the same. D) None of the above. Show Answer Correct Answer: A) Increases. 40. E$^{o}$cell ( Standard Cell Potential)-The potential measured at a specific temperature (298 K) with no current flowing and all concentrations in their "Standard States" . Which in False about "Standard States" ? A) 1 M for solutions. B) 1 atm for gases. C) Pure solids for electrodes. D) None. Show Answer Correct Answer: D) None. 41. What is the effect of increasing the concentration of the electrolyte in an electrolytic cell? A) It has no effect on the cell potential. B) It decreases the cell potential. C) It reverses the direction of the current. D) It increases the cell potential. Show Answer Correct Answer: D) It increases the cell potential. 42. In the reaction:Fe + Cu$^{2+ }$ $\rightarrow$Fe$^{2+}$ + CuWhat is the reductant? A) Fe$^{2+}$. B) Fe. C) Cu$^{2+}$. D) Cu. Show Answer Correct Answer: B) Fe. 43. It is the negative or reducing electrode that releases electrons to the external circuit and oxidizes during and electrochemical reaction. A) Anode. B) Diode. C) Electrode. D) Cathode. Show Answer Correct Answer: A) Anode. 44. What does electrochemistry deal with? A) Le Chat's Principle. B) Chemical formulas. C) Electricity. D) Chemical reactions. Show Answer Correct Answer: D) Chemical reactions. 45. What conditions are necessary to directly measure a standard electrode potential (E$^{o}$) of a metal/metal ion combination?I. A half-cell with that metal electrode immersed in a 1.0 M solution of its ions.II. Coupled to a standard hydrogen electrode under standard conditions.III. Voltmeter between half-cells to measure the potential difference. A) I and II. B) I and III. C) II and III. D) I, II and III. Show Answer Correct Answer: D) I, II and III. 46. The reaction, 3ClO$^{-}$ (aq) $\rightarrow$ ClO$_{3}$ (aq) + 2Cl$^{-}$ (aq) is an example of A) Reduction reaction. B) Decomposition reaction. C) Oxidation reaction. D) Disproportionation reaction. Show Answer Correct Answer: D) Disproportionation reaction. 47. What gas is collected at anode when an aqueous solution of sodium chloride is electrolyzed? A) Hydrogen. B) Chlorine. C) Water vapour. D) Oxygen. Show Answer Correct Answer: B) Chlorine. 48. An aqueous solution that conducts electricity A) Electrolyte. B) Magnesium. C) Hydrogen. D) Water. Show Answer Correct Answer: A) Electrolyte. 49. Why are half-reactions important in electrochemical cells? A) They enable the separation of oxidation and reduction processes. B) They increase the speed of the overall reaction. C) They decrease the energy required for the reaction. D) They allow for the direct transfer of electrons between reactants. Show Answer Correct Answer: A) They enable the separation of oxidation and reduction processes. 50. What unit of measurement do we use to measure electrical potential? A) Amps. B) Watts. C) Ohms. D) Volts. Show Answer Correct Answer: D) Volts. 51. The number of d-electrons retained in Fe$^{2+}$ (At. no. Fe = 26) ions are A) 5. B) 4. C) 3. D) 6. Show Answer Correct Answer: D) 6. 52. A battery uses a redox reaction to produce a(n) ..... A) Electric current. B) Sublimation. C) Decomposition. D) Evaporation. Show Answer Correct Answer: A) Electric current. ← PreviousRelated 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