This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 26 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 26 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which is the correct expression of the Gibbs free energy equation A) $\Delta G=\Delta H-\Delta TS$. B) $\Delta G=\Delta S-T\Delta H$. C) $\Delta G=\Delta H-T\Delta S$. D) $\Delta G=\Delta H\cdot T\cdot\Delta S$. Show Answer Correct Answer: C) $\Delta G=\Delta H-T\Delta S$. 2. On the electrolysis of dil. sulphuric acid using Platinum(Pt) electrode, the product obtained at anode will be A) O$_{2 }$ gas. B) H$_{2}$S gas. C) SO$_{2}$ gas. D) H$_{2}$ gas. Show Answer Correct Answer: D) H$_{2}$ gas. 3. What is the relationship between Gibbs free energy and cell potential? A) $\Delta$G = nFE; a positive $\Delta$G indicates a negative cell potential. B) $\Delta$G =-nFE; cell potential has no relation to $\Delta$G. C) $\Delta$G = 0; cell potential is always zero. D) $\Delta$G =-nFE; a negative $\Delta$G indicates a positive cell potential. Show Answer Correct Answer: D) $\Delta$G =-nFE; a negative $\Delta$G indicates a positive cell potential. 4. In the reaction:Fe + Cu$^{2+ }$ $\rightarrow$Fe$^{2+}$ + CuWhat species is reduced? A) Fe. B) Cu$^{2+}$. C) Fe$^{2+}$. D) Cu. Show Answer Correct Answer: B) Cu$^{2+}$. 5. Calculate the time to deposit 1.27 g of copper at cathode when a current of 2A was passed through the solution of CuSO4.(Molar mass of Cu = 63.5 g mol-1, 1 F = 96500 C mol-1) A) T=1930 seconds. B) T=2930 seconds. C) T=1530 seconds. D) T=1630 seconds. Show Answer Correct Answer: A) T=1930 seconds. 6. What does the Nernst equation allow you to calculate? A) The equilibrium constant for a chemical reaction. B) The cell potential under non-standard conditions. C) The rate of an electrochemical reaction. D) The amount of energy required to start a reaction. Show Answer Correct Answer: B) The cell potential under non-standard conditions. 7. Kation ialah A) Ion yang bercas negatif. B) Ion yang bercas positif. C) Terminal positif bateri. D) Terminal negatif bateri. Show Answer Correct Answer: B) Ion yang bercas positif. 8. The equivalent conductance of solution of a weak monobasic acid is 8.0 mhos cm$^{2}$ and at infinite dilution is 400 mhos cm$^{2}$. The dissociation constant of this acid is:(A) (B) (C) (D) A) 1.25 10$^{-4}$. B) 1.25 10$^{-5}$. C) 1.25 10$^{-6}$. D) 6.25 10$^{-4}$. Show Answer Correct Answer: B) 1.25 10$^{-5}$. 9. If during d-d transition if elctron abseorb Voilet colour which colour it will emit. A) Yellow. B) Green. C) Orange. D) Blue. Show Answer Correct Answer: A) Yellow. 10. A non-spontaneous electrochemical process that USES electricity A) Filtration. B) Oxidation. C) Reduction. D) Electrolysis/electrolytic cell. Show Answer Correct Answer: D) Electrolysis/electrolytic cell. 11. Which metal contains position potential value? A) Cu. B) Cr. C) Zn. D) Fe. E) Cu. Show Answer Correct Answer: A) Cu. 12. What are some common applications of electrochemical cells in everyday life? A) Weather forecasting models. B) Toothpaste ingredients. C) Batteries, power sources for vehicles, corrosion protection, electroplating, sensors. D) Traffic light control systems. Show Answer Correct Answer: C) Batteries, power sources for vehicles, corrosion protection, electroplating, sensors. 13. Can F$_{2}$/F$^{-}$ oxidize Pb/Pb$^{2+}$? A) Yes. B) No. C) Not sure, it depends on concentration. D) It depends on the temperature. Show Answer Correct Answer: A) Yes. 14. Conductivity of a solution decrease with dilution DUE TO A) The number of ionsper unit volume (responsible for carrying current) increases. B) The number of ionsper unit volume (responsible for carrying current) decreases. C) The number of ionsper unit volume (responsible for carrying current) remains same. D) None. Show Answer Correct Answer: B) The number of ionsper unit volume (responsible for carrying current) decreases. 15. In the Nernst equation, what does the variable 'n' represent? A) The number of moles of electrons transferred. B) The concentration of ions. C) The temperature in Kelvin. D) The gas constant. Show Answer Correct Answer: A) The number of moles of electrons transferred. 16. What is the name of the positive terminal in an electrolytic cell? A) Cathode. B) Anode. C) All the above. D) None of the above. Show Answer Correct Answer: B) Anode. 17. At infinite dilution when dissociation is complete every ion make a definite contribution toward molar conductivity irrespective to the nature of other ion with which it is associated is A) Kohlraush's law. B) Faraday's law. C) Molar conductivity law. D) Amonton's law. Show Answer Correct Answer: A) Kohlraush's law. 18. Calculate the emf of the following cell at 25$^\circ$C:Ag(s) | Ag$^{+}$ (10$^{-3}$ M) || Cu$^{2+}$ (10$^{-1}$ M) | Cu(s) Given E$^{0}$$_{cell}$ = +0.46 V and log 10$^{n}$ = n. A) .5V. B) +.61 V. C) -.61V. D) -.89V. Show Answer Correct Answer: B) +.61 V. 19. E represents A) Single electrode potential. B) Standard electrode potential. C) Standard hydrogen electrode. D) None. Show Answer Correct Answer: A) Single electrode potential. 20. Which of the following statements about the Nernst equation is true? A) It is used to calculate the pH of a solution. B) It relates the cell potential to the concentrations of the reactants and products. C) It determines the temperature of the reaction. D) It measures the conductivity of the solution. Show Answer Correct Answer: B) It relates the cell potential to the concentrations of the reactants and products. 21. Which of the following is an example of an electrolytic cell? A) A lemon battery. B) A zinc-carbon battery. C) Electroplating silver onto a spoon. D) A potato clock. Show Answer Correct Answer: C) Electroplating silver onto a spoon. 22. In voltaic cells, such as those diagrammed in your text, the salt bridge ..... A) Is not necessary in order for the cell to work. B) Acts as a mechanism to allow mechanical mixing of the solutions. C) Allows charge balance to be maintained in the cell. D) Is tightly plugged with firm agar gel through which ions cannot pass. E) Drives free electrons from one half-cell to the other. Show Answer Correct Answer: C) Allows charge balance to be maintained in the cell. 23. The electrode potential of saturated calomel electrode is A) 0.281 V. B) 0.181V. C) 0.2422V. D) 0.333V. Show Answer Correct Answer: C) 0.2422V. 24. Which of the following will form the cathode with respect to iron anode in an electrolyte cell-( Eo =-0.40 v) A) Mg (-2.37v). B) Cd (-0.44v). C) Ni (-0.22v). D) Al (-1.67v). Show Answer Correct Answer: C) Ni (-0.22v). 25. The elctro potential of zinc half cell is A) 0.76v. B) 0.34v. C) -0.76v. D) 1.1v. Show Answer Correct Answer: C) -0.76v. ← 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