This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The rate constant for a first order reaction is 60 s$^{-1}$. How much time will it take to reduce the initial concentration of the reactant to its l/10th value? A) .0380. B) .048. C) .09. D) .01. Show Answer Correct Answer: A) .0380. 2. Specific conductance is product of cell constant and ..... A) Conductivity. B) Resistivity. C) Resistance. D) Conductance. Show Answer Correct Answer: D) Conductance. 3. Which of the following statement is TRUE about a Daniell cell? A) Copper electrode is the anode. B) Zinc electrode is the cathode. C) Electron flows from anode to cathode. D) Both electrodes used are graphite rods. Show Answer Correct Answer: C) Electron flows from anode to cathode. 4. Al$^{3+}$(aq) + 3e$^{-}$$\rightarrow$Al(s) E$^\circ$ =-1.66 VAg$^{+}$(aq) + e$^{-}$$\rightarrow$Ag(s) E$^\circ$ = +0.80 VAccording to the standard reduction potentials given above, what is the standard cell potential for the reaction represented below?3Ag$^{+}$(aq) + Al(s) $\rightarrow$3Ag(s) + Al$^{3+}$(aq) A) 0.46 V. B) 3.66 V. C) 1.20 V. D) 2.46 V. Show Answer Correct Answer: D) 2.46 V. 5. In electrochemical series, negative electrode potential values are placed at A) Bottom. B) Top. C) Right. D) None. Show Answer Correct Answer: B) Top. 6. Explain the significance of the cathode in electrochemical reactions. A) The cathode is significant as it is the site of reduction in electrochemical reactions, enabling electron transfer and driving the reaction. B) The cathode does not play a role in electron transfer during reactions. C) The cathode is the source of ions in electrochemical cells. D) The cathode is where oxidation occurs in electrochemical reactions. Show Answer Correct Answer: A) The cathode is significant as it is the site of reduction in electrochemical reactions, enabling electron transfer and driving the reaction. 7. What is the oxidation number of chromium in the chromate ion, CrO$_{4}$$^{2-}$? A) 6. B) 2. C) 3. D) 8. Show Answer Correct Answer: A) 6. 8. One type of experimental battery for electric cars uses the active metal ..... A) Lithium. B) Potassium. C) Rubidium. D) Sodium. Show Answer Correct Answer: A) Lithium. 9. The Resistance of a conductor is directly proportional to A) Length. B) Area of cross section. C) Width. D) Height. Show Answer Correct Answer: B) Area of cross section. 10. Which of the following is true about the Nernst equation at equilibrium? A) The cell potential is zero. B) The cell potential is at its maximum. C) The cell potential is equal to the standard cell potential. D) The cell potential is negative. Show Answer Correct Answer: A) The cell potential is zero. 11. Which ion can be most easily oxidized A) Copper +2. B) Zinc +2. C) Iron +2. D) Calcium +2. Show Answer Correct Answer: D) Calcium +2. 12. This provides a path for ions to travel in an electrochemical cell A) Salt bridge. B) Copper bridge. C) Sugar bridge. D) Carbon tunnel. Show Answer Correct Answer: A) Salt bridge. 13. They are two types of reaction are possible in SHE depends on ..... we take A) Electrolyte. B) Metal. C) Potential. D) None of the above. Show Answer Correct Answer: B) Metal. 14. How does the concentration of electrolytes affect the cell potential? A) Higher concentrations of electrolytes decrease the cell potential. B) Lower concentrations of electrolytes have no effect on cell potential. C) Higher concentrations of electrolytes can increase the cell potential. D) The concentration of electrolytes has an inverse relationship with cell potential. Show Answer Correct Answer: C) Higher concentrations of electrolytes can increase the cell potential. 15. In electrolytic cell, anode will attract ..... A) Cations. B) Anions. C) All the above. D) None of the above. Show Answer Correct Answer: B) Anions. 16. In addition to a fuel, what other chemical is needed by a fuel cell? A) Nitrogen. B) Oxygen. C) Methane. D) None of the above. Show Answer Correct Answer: B) Oxygen. 17. Which of the following is not the unit of conductance A) Siemens. B) Mho. C) Ohm. D) $\frac{1}{ohm}$. Show Answer Correct Answer: D) $\frac{1}{ohm}$. 18. What is The relationship between Z &E A) Inversely proportional. B) No relation. C) Directly proportional. D) A) & C) both. Show Answer Correct Answer: C) Directly proportional. 19. An aqueous solution of zinc sulphate is electrolysed between zinc electrodes. Which of the following will not affect the mass of zinc deposited. A) Concentration of zinc sulphate. B) Amount of current. C) Duration of electrolysis. D) Type of electrodes. Show Answer Correct Answer: A) Concentration of zinc sulphate. 20. What would be the theoretical cell potential of the previous electrochemical cell?Ag$^{+}$/Ag = 0.80VNi$^{2+}$/Ni =-0.25V A) 1.05V. B) -1.05V. C) 0.55V. D) -0.55V. Show Answer Correct Answer: A) 1.05V. 21. An oxidizing agent will A) Increase in mass. B) Lose electrons. C) Be reduced. D) Increase in oxidation number. Show Answer Correct Answer: C) Be reduced. 22. When tin is over iron, it acts as an oxidizing agent and protects iron. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: B) FALSE. 23. EMF can be used A) To determine standard free energy. B) To determine equilibrium constant. C) To determine Heat change. D) All the above. Show Answer Correct Answer: D) All the above. 24. Which type of equation can represent the oxidation occurring in a reaction? A) A double-replacement reaction equation. B) A half-reaction equation. C) A neutralization reaction equation. D) A transmutation reaction equation. Show Answer Correct Answer: B) A half-reaction equation. 25. An example of a strong electrolyte is: A) Ammonium hydroxide. B) Acetic acid. C) Sodium hydroxide. D) Urea. Show Answer Correct Answer: C) Sodium hydroxide. ← 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 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 10Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books