This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If the E$^{0}$$_{cell}$ for a given reaction has a negative value, which of the following gives the correct relationship for the values of $\Delta$G$^{0}$? A) $\Delta$G$^{0 }$> 0. B) $\Delta$G$^{0 }$< 0. C) $\Delta$G$^{0 }$= 0. D) $\Delta$G$^{0 }$> / < 0. Show Answer Correct Answer: A) $\Delta$G$^{0 }$> 0. 2. If the concentration of Cu2+ ions is 0.1 M and Cu(s) is at 1 atm, calculate the cell potential for the given reaction. A) 0.25 V. B) 0.42 V. C) 0.18 V. D) 0.34 V. Show Answer Correct Answer: D) 0.34 V. 3. In a process called flash electroplating, a current of 2.90 x 10$^{3}$ A passes through an electrolytic cell for 8.00 minutes. How many moles of electrons are driven through the cell? (use 96, 485 C) A) -14.4271 mol e-. B) 14.4271 mol e-. C) -14.4272 mol e-. D) 14.4272 mol e-. Show Answer Correct Answer: B) 14.4271 mol e-. 4. The electrode potential measures A) Tendency of cell reaction to occur. B) Current carried by an electrode. C) Tendency of an electrode to gain or lose electron. D) Difference in ionization of electrode and metal ion. Show Answer Correct Answer: C) Tendency of an electrode to gain or lose electron. 5. A redox is not a ..... A) Single Replacement Reaction. B) Double Replacement Reaction. C) Transfer of electrons from one element to another. D) An element that goes from a zero charge to a charged particle in a reaction. Show Answer Correct Answer: B) Double Replacement Reaction. 6. In electrolytic cell which its electrolyte is copper(II) sulphate, copper are used as electrodes. What is the product at the anode? A) Oxygen gas and water. B) Copper metal. C) Copper (II) ions. D) Hydrogen gas. Show Answer Correct Answer: C) Copper (II) ions. 7. The anode is also known as the ..... half of the cell. A) Positive. B) Negative. C) Neutral. D) Inactive. Show Answer Correct Answer: B) Negative. 8. What is the unit of electrode potential? A) Newtons (N). B) Joules (J). C) Volts (V). D) Amperes (A). Show Answer Correct Answer: C) Volts (V). 9. For cell notation:Cd (s)/Cd$^{2+}$(aq) // Cu$^{2+}$(aq)/Cu(s) the voltage can be increased by A) Reducing [Cu$^{2+}$]. B) Reducing [Cd$^{2+}$]. C) Increasing [Cd$^{2+}$]. D) Reducing [Cu$^{2+}$] and [Cd$^{2+}$]. Show Answer Correct Answer: B) Reducing [Cd$^{2+}$]. 10. For SHE potential, concentration of the solution and pressure always be A) Unity. B) Zero. C) Half. D) None of the above. Show Answer Correct Answer: A) Unity. 11. In a galvanic cell, which direction do electrons flow? A) From cathode to anode. B) From anode to cathode. C) From positive to negative terminal. D) From negative to positive terminal. Show Answer Correct Answer: B) From anode to cathode. 12. During electroplating which metal covering is done on Fe A) Zn. B) Mg. C) Pb. D) Sn. Show Answer Correct Answer: D) Sn. 13. What is meant by invariant point? A) Number of phases is zero. B) Number of component is zero. C) Degree of freedom is zero. D) Non of the above. Show Answer Correct Answer: C) Degree of freedom is zero. 14. In the reaction:Fe + Cu$^{2+ }$ $\rightarrow$Fe$^{2+}$ + CuWhat species is oxidized? A) Fe. B) Cu$^{2+}$. C) Fe$^{2+}$. D) Cu. Show Answer Correct Answer: A) Fe. 15. What is the purpose of the salt bridge in an electrochemical cell? A) To increase the voltage. B) To allow the flow of electrons. C) To complete the circuit by allowing ion flow. D) To separate the two half-cells physically. Show Answer Correct Answer: C) To complete the circuit by allowing ion flow. 16. Define standard electrode potential. A) Standard electrode potential is the measure of the tendency of a half-cell to form covalent bonds. B) Standard electrode potential is the measure of the tendency of a half-cell to gain electrons and be oxidized. C) Standard electrode potential is the measure of the tendency of a half-cell to attract protons. D) Standard electrode potential is the measure of the tendency of a half-cell to lose electrons and be reduced. Show Answer Correct Answer: D) Standard electrode potential is the measure of the tendency of a half-cell to lose electrons and be reduced. 17. Electrolytic cell is based on a spontaneous reaction. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 18. What is the oxidation state of sulfur in sulfuric acid (H$_{2}$SO$_{4}$)? A) +4. B) +6. C) -2. D) 0. Show Answer Correct Answer: B) +6. 19. Calculate the standard cell potential.3Mg + 2Al$^{3+}$ $\rightarrow$ 2Al + 3Mg$^{2+}$ A) +0.71 V. B) -0.71 V. C) All the above. D) None of the above. Show Answer Correct Answer: A) +0.71 V. 20. The oxidation state of a species undergoing oxidation decreases A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 21. In a chemistry class, Lily and Aiden were discussing a chemical reaction. Lily said that oxidation is happening in the reaction. What did she mean by oxidation? A) It is the gain of electrons. B) It is the loss of electrons. C) It is the creation of electrons. D) It is the destruction of electrons. Show Answer Correct Answer: B) It is the loss of electrons. 22. Which component in a galvanic cell prevents the reaction from reaching equilibrium instantly? A) Electrolyte. B) Cathode. C) Salt bridge. D) Anode. Show Answer Correct Answer: C) Salt bridge. 23. 16H+ + 5Fe + 2Mn04-$\rightarrow$ 5Fe2+ + 2Mn2+ + 8H2OWHICH IS OXIDISED? A) MnO4-. B) Fe. C) Fe2+. D) Mn2+. Show Answer Correct Answer: B) Fe. 24. In a galvanic cell the electrode at which the electrons released is called ..... and the change that occurs at this electrode is called ..... A) Cathode, Reduction. B) Anode, Oxidation. C) Anode, reduction. D) Cathode, oxidation. Show Answer Correct Answer: B) Anode, Oxidation. 25. Saturated solution of KNO3 is used to make 'salt bridge' because [IIT JEE 2001] A) Velocity of K+ is greater than that of NO3-. B) Velocity of NO3-is greater than that of K+. C) Velocity of both K+ and NO3-are nearly the same. D) KNO3 is highly soluble in water. Show Answer Correct Answer: C) Velocity of both K+ and NO3-are nearly the same. 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