This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 29 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 29 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. Where are the electrons found in an atom? A) Inside the nucleus. B) Inside the protons. C) Outside the nucleus. D) Outside the protons. Show Answer Correct Answer: C) Outside the nucleus. 3. Discuss the applications of electrolysis in industry. A) Electroplating, metal extraction, production of chemicals. B) Medical surgeries, dental procedures, veterinary care. C) Cooking food, heating water, generating electricity. D) Building construction, road paving, car manufacturing. Show Answer Correct Answer: A) Electroplating, metal extraction, production of chemicals. 4. One of the metals most difficult to oxidize is ..... A) Potassium. B) Sodium. C) Calcium. D) Copper. Show Answer Correct Answer: D) Copper. 5. 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) 5.4 g. B) 10.8 g. C) 54.0 g. D) 108.0 g. Show Answer Correct Answer: D) 108.0 g. 6. When molten NaCl is electrolysed what has forms at the cathode? A) Hydrogen. B) Oxygen. C) Chlorine. D) Sodium. Show Answer Correct Answer: D) Sodium. 7. 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) 0.019 g. B) 67 g. C) 44 g. D) 2.5 g. Show Answer Correct Answer: B) 67 g. 8. 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. 9. Which is correct cell notationAnode:ZnCathode:Ni A) Zn$^{2+ }$(aq, 1M) / Zn (s) // Ni (s) / Ni$^{2+ }$(aq, 1M). B) Zn$^{2+ }$(s, 1M) / Zn (aq) // Ni (aq) / Ni$^{2+ }$(s, 1M). C) Zn (s) /Zn$^{2+ }$(aq, 1M) // Ni$^{2+ }$(aq, 1M) / Ni (s). D) Zn (aq) /Zn$^{2+ }$(s, 1M) // Ni$^{2+ }$(s, 1M) / Ni (aq). Show Answer Correct Answer: C) Zn (s) /Zn$^{2+ }$(aq, 1M) // Ni$^{2+ }$(aq, 1M) / Ni (s). 10. 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. 11. 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. 12. 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) Pb(s) + I$_{2}$(aq) + 2e$^{-}$ $\rightarrow$ PbI (s) + I$^{-}$(aq). B) Pb(s) + I$_{2}$(aq) $\rightarrow$ PbI$_{2}$(s). C) Pb(s) + Cl$_{2}$(aq) $\rightarrow$ Pb$^{2+}$(aq) + 2I$^{-}$(aq). D) 2Pb(s) + 4e$^{-}$ $\rightarrow$ 2PbI(s) + I$_{2}$(aq). Show Answer Correct Answer: B) Pb(s) + I$_{2}$(aq) $\rightarrow$ PbI$_{2}$(s). 13. What is the effect of temperature on the Nernst equation? A) Temperature has no effect. B) Higher temperatures increase the cell potential. C) Higher temperatures decrease the cell potential. D) Temperature affects the cell potential through the $RT/nF$. Show Answer Correct Answer: D) Temperature affects the cell potential through the $RT/nF$. 14. 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. 15. Choose the correct cell representation of Na ion battery A) Na$^{+}$ | Na, C | Electrolyte containing sodium salt | Na-MO2. B) Na | Na$^{+}$, C | Electrolyte containing sodium salt | Na-MO2. C) Na | Na$^{+}$, Na-MO2 | Electrolyte containing sodium salt | C. D) Na$^{+}$ | Na, Na-MO2 | Electrolyte containing sodium salt | C. Show Answer Correct Answer: B) Na | Na$^{+}$, C | Electrolyte containing sodium salt | Na-MO2. 16. 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. 17. 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. 18. What is the quantity of electricity in Faraday required to Reduce 1 mole of MnO$_{4}$$^{-}$ to Mn$^{2+}$. A) 4. B) 5. C) 6. D) 8. Show Answer Correct Answer: B) 5. 19. 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) .33 V. B) 1.69V. C) -0.28 V. D) -.85 V. Show Answer Correct Answer: C) -0.28 V. 20. Which of the following is not a secondary battery A) Mercury cell. B) Lead acid cell. C) Ni-MH cell. D) Li ion battery. Show Answer Correct Answer: A) Mercury cell. 21. What is the oxidation state of nitrogen in the compound NH$_{4}$Br? A) -1. B) +2. C) -3. D) 4. Show Answer Correct Answer: C) -3. 22. For redox reaction to proceed in a cell, the e.m.f. must be A) Positive. B) Negative. C) Fixed. D) Zero. Show Answer Correct Answer: A) Positive. 23. The specific conductivity of 0.20M solutionof KCl at 298 K is 0.0248 S/cm. Calculate itsmolar conductivity. A) 112 Scm$^{2}$mol$^{-1}$. B) $^{ }$124 Scm$^{2}$mol$^{-1}$. C) 136 Scm$^{2}$mol$^{-1}$. D) 148 Scm$^{2}$mol$^{-1}$. Show Answer Correct Answer: B) $^{ }$124 Scm$^{2}$mol$^{-1}$. 24. What is the main cause of corrosion in metals? A) Exposure to high temperatures. B) Mechanical stress. C) Chemical reactions with environmental substances. D) Exposure to ultraviolet light. Show Answer Correct Answer: C) Chemical reactions with environmental substances. 25. 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. ← PreviousNext →Related 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 8Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 9Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books