This quiz works best with JavaScript enabled. Home > Class 12 > 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 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The product obtained at cathode after electrolysis of molten NaCl. A) Cl$_{2}$. B) Na. C) All the above. D) None of the above. Show Answer Correct Answer: B) Na. 2. Faraday's law of electrolysis is related to A) Atomic mass. B) Atomic number. C) Equivalent mass. D) Mobility of the anion and cation. Show Answer Correct Answer: C) Equivalent mass. 3. How does temperature affect the cell potential in electrochemical cells? A) Higher temperatures always decrease cell potential. B) Temperature has no effect on cell potential. C) Temperature affects cell potential by altering reaction rates and equilibrium constants, influencing the overall voltage output. D) Temperature only affects the physical size of the cell. Show Answer Correct Answer: C) Temperature affects cell potential by altering reaction rates and equilibrium constants, influencing the overall voltage output. 4. For the given cell, Mg|Mg$^{2+}$|| Cu$^{2+}$|Cu A) (i) Mg is cathode. B) (ii) Cu is anode. C) (iii) The cell reaction is Mg + Cu2+ $\rightarrow$ Mg2+ + Cu. D) (iv) Cu is the oxidising agent. Show Answer Correct Answer: C) (iii) The cell reaction is Mg + Cu2+ $\rightarrow$ Mg2+ + Cu. 5. What is electroplating? A) Using electricity to plate a substance with a metal. B) Using Table J to figure out which element is more oxidized. C) An aqueus compound being bonded. D) Put a key in liquid metal to turn it different colors. Show Answer Correct Answer: A) Using electricity to plate a substance with a metal. 6. Pick the CORRECT statement about S.H.E. A) S.H.E is used as a reference electrode to measure standard reduction potential of half-cell. B) S.H.E consists of a gold plate immersed in a basic solution. C) Standard reduction potential for S.H.E. is 1.00 V. D) Hydrogen gas at 1 atm and 0 $^\circ$C is pumped through S.H.E. Show Answer Correct Answer: A) S.H.E is used as a reference electrode to measure standard reduction potential of half-cell. 7. The ratio t$_{7/8}$:t$_{1/2}$ for the first order is A) 5. B) 2. C) 7. D) 3. Show Answer Correct Answer: D) 3. 8. Which of the following statements is true about electrolysis? A) It occurs in galvanic cells. B) It requires a spontaneous reaction. C) It can only occur in liquid solutions. D) It converts electrical energy into chemical energy. Show Answer Correct Answer: D) It converts electrical energy into chemical energy. 9. In electrolytic cell, anode electrode is connected to ..... A) Positive Terminal. B) Negative Terminal. C) All the above. D) None of the above. Show Answer Correct Answer: A) Positive Terminal. 10. All of the following statements concerning voltaic cells are true EXCEPT A) A salt bridge allows cations and anions to move between the half-cells. B) Electrons flow from the cathode to the anode in the external circuit. C) Oxidation occurs at the anode. D) A voltaic cell consists of two-half cells. Show Answer Correct Answer: B) Electrons flow from the cathode to the anode in the external circuit. 11. Species reduced in corrosion A) O$_{2}$. B) Fe. C) Mg. D) None of the above. Show Answer Correct Answer: A) O$_{2}$. 12. In a Galvanic Cell, the anode is ..... A) Positive. B) Negative. C) All the above. D) None of the above. Show Answer Correct Answer: B) Negative. 13. Naphthalene does not conduct electricity because it A) Contains freely moving electrons. B) Has very low melting points. C) Consists of molecules which are uncharged particles. D) Contains ionic compounds which can dissolve in water. Show Answer Correct Answer: C) Consists of molecules which are uncharged particles. 14. Which of the following is a component of the Nernst equation? A) Faraday's constant. B) Planck's constant. C) Avogadro's number. D) Boltzmann's constant. Show Answer Correct Answer: A) Faraday's constant. 15. True or false. Electroplating is a process whereby a metal surface is coated with a non-metal. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: A) False. 16. What is a practical application of reverse electrochemical processes? A) Producing heat in furnaces. B) Metal plating in manufacturing. C) Cooling systems in refrigerators. D) Generating electricity in power plants. Show Answer Correct Answer: B) Metal plating in manufacturing. 17. Which statement is incorrect for lead storage battery A) Spongy lead used as anode. B) 68% sulphuric acid by mass is used as electrolyte. C) Red lead oxide is used as anode. D) Red lead oxide is used as cathode. Show Answer Correct Answer: C) Red lead oxide is used as anode. 18. The molar conductivity of a 1.5 M solution of an electrolyte is found to be 138.9 S cm2 mol-1. Calculate the conductivity of this solution. A) 0.20835 S cm-1. B) 0.30835 S cm-1. C) 0.21835 S cm-1. D) 0.30835 S cm-1. Show Answer Correct Answer: A) 0.20835 S cm-1. 19. Molten X is electrolysed using carbon electrodes. After 10 minutes, a brown solid is deposited on the cathode and a brown gas is released at the anode. What is molten X? A) Lead(II) chloride. B) Lead(II) bromide. C) Copper(II) chloride. D) Copper(II) bromide. Show Answer Correct Answer: D) Copper(II) bromide. 20. The standard potential of Galvanic cell is A) 1.5v. B) 1.35v. C) 1.1v. D) 1.2v. Show Answer Correct Answer: C) 1.1v. 21. Given the following cell:Zn | Zn$^{2+}$ || Sn$^{2+}$ | Snin order to increase the voltage, one could A) Increase [Zn$^{2+}$]. B) Increase [Sn$^{2+}$]. C) Use more Zn. D) Use more Sn. Show Answer Correct Answer: B) Increase [Sn$^{2+}$]. 22. When NaCl solution is electrolysed what has forms at the anode? A) Hydrogen. B) Oxygen. C) Chlorine. D) Sodium. Show Answer Correct Answer: C) Chlorine. 23. When an atom donates electrons, it becomes ..... A) A negative ion. B) A positive ion. C) A neutral atom. D) A molecule. Show Answer Correct Answer: B) A positive ion. 24. During electrolysis of aqueous NaCl, the product formed at cathode is A) Na metal. B) Cl2 gas. C) H2 gas. D) All of above. Show Answer Correct Answer: C) H2 gas. 25. Nernst equation for an electrode is based on the variation of electrode potential of an electrode with A) Temperature. B) Concentration of electrolyte. C) Both a & b. D) Density of the electrodes. Show Answer Correct Answer: B) Concentration of electrolyte. ← 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