This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 28 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 28 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Effect of dilution on conductivity of solution A) Increases. B) Decreases. C) Unchanged. D) None of the above. Show Answer Correct Answer: A) Increases. 2. You have a solution of dil. NaNO3 in water.How can you predict the element discharged at the Anode? A) The highest charge will react. B) The solute will react. C) The Anion with the higher concentration will bwe discharged. D) The Anion with the lower concenteration will be discharged. Show Answer Correct Answer: C) The Anion with the higher concentration will bwe discharged. 3. Sophia is conducting an experiment in her chemistry class. She uses a device that converts chemical energy into electrical energy to drive a chemical reaction. A) Redox Reactions. B) Electrochemical Cell. C) Electrochemistry. D) Anode. Show Answer Correct Answer: B) Electrochemical Cell. 4. After a steady current of 18.0 A was passed for 20.0 minutes through a solution of copper(II) sulphate, the mass of the impure copper anode decreased by 8.01 g. What is the percentage purity of copper in the impure copper rod? [Ar Cu = 63.5 ; Faraday's constant = 96500 C mol$^{-1}$] A) 73.5%$^{ }$. B) 79.6%. C) 81.2%$^{ }$. D) 88.7%$^{ }$. Show Answer Correct Answer: D) 88.7%$^{ }$. 5. What happen if external emf greater than 1.1 Volt is applied on Daniel Cell. A) Cell stop working. B) Nothing Happens. C) Cell Reaction Reverse. D) None of These. Show Answer Correct Answer: C) Cell Reaction Reverse. 6. What role does the Nernst equation play in determining the pH of a solution? A) It is used to calculate the pH directly. B) It helps in determining the hydrogen ion concentration. C) It is not related to pH measurement. D) It provides the standard pH value. Show Answer Correct Answer: B) It helps in determining the hydrogen ion concentration. 7. The electrode at which oxidation occurs is called the ..... A) Anode. B) Cathode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Anode. 8. What is the oxidation state of nitrogen in NaNO$_{2}$? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: C) 3. 9. What charge, in coulombs, is required to deposit 1.5 g Mg(s) from a solution of Mg$^{2+}$(aq)? (F = 96480 C/mol e$^{-}$) A) 4.1 x 10$^{2}$ C. B) 6.0 x 10$^{3}$ C. C) 1.2 x 10$^{4}$ C. D) 2.9 x 10$^{5}$ C. Show Answer Correct Answer: C) 1.2 x 10$^{4}$ C. 10. Answer the following questions using the unbalanced half-reaction:Cr$_{2}$O$_{7}$$^{2-}$ + H$^{+}$ $\rightarrow$ Cr$^{3+}$ + H$_{2}$OWhat is the oxidation number of Cr in Cr$_{2}$O$_{7}$$^{2-}$? A) -2. B) +3. C) +5. D) +6. Show Answer Correct Answer: D) +6. 11. What is a standard half-cell? A) It is one cell that comprises half of a whole battery. B) It is a cell containing only a metal bar with no aqueous ion solution. C) It is a cell containing only an aqueous ion solution and no metal bar. D) It is a cell that generates half of a volt of electricity. Show Answer Correct Answer: A) It is one cell that comprises half of a whole battery. 12. What role does a cellulose separator play in a battery? A) It acts as a catalyst for reactions. B) It conducts electricity between electrodes. C) It prevents the mixing of different electrolytes. D) It stores electrical energy. Show Answer Correct Answer: C) It prevents the mixing of different electrolytes. 13. Reduction is the loss of electrons. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 14. The reaction, 3ClO-(aq) $\rightarrow$ ClO3 (aq) + 2Cl-(aq) is an example of A) Oxidation. B) Reduction. C) Disproportion. D) Decomposition. Show Answer Correct Answer: C) Disproportion. 15. Which of the following is a primary component of a galvanic cell? A) Anode and cathode. B) Salt bridge and voltmeter. C) Electrolyte and electrode. D) All of the above. Show Answer Correct Answer: D) All of the above. 16. FARADAY'S LAW CAN BE EXPRESSED AS; A) M = ZIF. B) M = ZQ. C) M = IT. D) M = Z-IT. Show Answer Correct Answer: B) M = ZQ. 17. Which of the following happens during the electrolysis of molten sodium bromide?I Sodium ions are attracted to the cathode.II Bromide ions are attracted to the anode.III Electrons are moving from anode to cathode.IV At the cathode, bromine ions accept electron from anode. A) I, II and III only. B) I, II and IV only. C) I, III and IV only. D) II, III and IV only. Show Answer Correct Answer: A) I, II and III only. 18. On increasing the temperature, the dissociation of an electrolyte increases, hence conduction A) Decreases. B) Remains constant. C) Increases. D) Temperature has no effect on electrolytic conduction. Show Answer Correct Answer: C) Increases. 19. Voltaic cell in which the reactants can be supplied continuously and the products of the cell reaction are continuously removed A) Fuel cells. B) Alkaline battery. C) Secondary cells. D) Primary cells. Show Answer Correct Answer: A) Fuel cells. 20. Which of the following is a characteristic of an electrolytic cell? A) It generates electrical energy. B) It does not involve chemical reactions. C) It requires an external power source. D) It operates spontaneously. Show Answer Correct Answer: C) It requires an external power source. 21. What type of reaction occurs when a metal atom becomes a positive ion? A) Oxidation. B) Reduction. C) Neutralization. D) Double replacement. Show Answer Correct Answer: A) Oxidation. 22. Which process requires energy to decompose a substance? A) Synthesis. B) Neutralization. C) Sublimation. D) Electrolysis. Show Answer Correct Answer: D) Electrolysis. 23. Which of the following would begin a reaction when added to a solution of tin(II) chloride, SnCl$_{2}$?(Use your table of standard reduction potentials.) A) Solid copper, Cu. B) Solid silver, Ag. C) Solid manganese, Mn. D) Solid gold, Au. Show Answer Correct Answer: C) Solid manganese, Mn. 24. Which law states that the mass of a substance produced at an electrode during electrolysis is proportional to the number of moles of electrons transferred at that electrode? A) Coulomb's law. B) Faraday's first law of electrolysis. C) Faraday's second law of electrolysis. D) Ohm's law. Show Answer Correct Answer: B) Faraday's first law of electrolysis. 25. Electrochemistry deals with A) Electric energy. B) Chemical energy. C) Only a. D) Both a & b. Show Answer Correct Answer: D) Both a & b. ← 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