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MCQS on Electrochemistry, 1. Electrolyte can conduct electricity, because, (a) molecules have unpaired electrons, (b) molecules have paired electron, (c) molecules have loosely held electrons d) molecules have ions, Which one of the following is electrolyte ?, 2., (a) benzene, (b) chloroform, Set sodium chloride, (d) sugar, 3., Which one of the following is not a weak electrolyte ?, (a) NH,OH, foT KOH, (c) CH;COOH, Which of the following is not a strong electrolyte ?, (d) H2CO3, 4., (a) NaCl, (b) NaOH, (c) KOH, d) NH,OH, 5. Electrolytic conduction is due to, ......, (a) movement of the electrolyte through the external wire, (b) flow of electrons through the solution, AO migration of ions to the oppositely charged electrode, (d) flow of positive ions through the external wire, 6., NaOH is considered as a strong base, because ..., (a) it is highly caustic substance, by it is ionized completely in aqueous solution, (c) it is readily soluble in water, (d) it is highly soluble in water, Acetic acid is a weak electrolyte because, 7., ......, (ay it does not ionize completely in aqueous solution, (b) it is partially soluble in water, (c) it is highly soluble in water, (d) none of the above, 8., Pure water does not conduct electricity because it is, (a) neutral, (b) decompose easily, fet almost not ionized, The electrode potential is the tendency of metal, (d) all of the the above, (a) to gain the electron, r either loss and gain of electron, (b) to loose electron, (d) none of the above, 9,
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Basic Science: Chemistry, 10. An electrochemical cell converts, 2.49, Metal Corrosion, Its Prevention, (a) electrical energy into chemical energy vor chemical energy into electrical energy, () chemical energy into heat energy, 11. Electrochemical cell is also known as, (d) electrical energy into heat energy, (a) electrolytic cell, (c) Daniel cell, 12. The passage of electricity in the Daniel cell, when zinc and copper electrodes ar, connected is from ...., KB Galvanic cell, (d) none of these, (a) Cu to Zn in the cell, (c) Zn to Cu in the cell, 13. In Galvanic cell, electrical energy is generated at the expense of ., (b) Cu to Zn outside the cell, Y Zn to Cu outside the cell, (a) free energy, (c) heat energy, 14. Chemical energy is converted directly into electrical energy in, b chemical energy, (d) kinetic energy, Vay a battery, (c) an electrolytic cell, 15. Sodium chloride is called an electrolyte, because ...., (a) its molecule is made up of electrically charged particles, (b) an electrical power plant, (d) an automobile engine, (b) it is decomposed, when an electric current is passed through it, (c) it breaks up into ions, when a current is passed through it, fr it ionizes, when fused or dissolved in a proper solvent, 16. Sulphuric acid is a stronger acid than acetic acid, because, (a) it dissociates completely, (c) acetic acid is strongly ionized, 17. A is weaker acid than B, if ....., ......, (b) it has high molecular weight, (d) none of these, (a) A is more easily decomposed than B, when heated, (b) A is not corrosive as B, 4oT A is less ionized than B, when melted or dissolved in a solvent, (d) A is displaced from its salt by B., 18. Sodium chloride is a bad conductor of electricity because, (a) it contains only molecules, (b) it does possess ions, Ve the ions present in it are not free to move, (d) it does not contain free m.olecules., 19. An electrolysis cell uses electrical energy to drive., Ja chemical reaction, (b) physical reaction, (d) none of the above, (c) no reaction
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20. Oxidation-reduction reaction involves.., (a) transfer of neutrons, (b) transfer of protons, Jet transfer of electrons, (d) none of the above, 21. The process used to deposit one metal over the another metal is called as, (a) electrolysis, (c) electrorefining, 22. Voltaic cells generate electricity by, LA67 electroplating, (d) electrometallurgy, fa) spontaneous redox reaction, (c) sublimation reaction, 23. Voltaic cell is also known as......, (b) non-spontaneous redox reaction, (d) thermochemical reaction, la) electrochemical cell and Galvanic cell (b) electrolytic cell and Galvanic cell, (c) voltameter and electrolytic cell, 24. When copper is plated on steel, anode is made up of..., (d) none of the above, (a) steel, (b) oxygen, (d) carbon, O copper, 25. By losing one or two electrons, atoms of metal are, Ja) oxidized, (c) hydrogenated, 26. In electrorefining of copper, 1% of little H2SO4 is added to electrolyte, V6) to increase its conductivity, (c) to increase its dilution, 27. Which one of the following will be good conductor of electricity ?, (b) reduced, (d) anodized, (b) to decrease its conductivity, (d) to increase its concentration, (a) pure water, (c) chloroform, 28. In electrolysis the process of oxidation occurs at, Va anode, Br impure water, (d) none of these, ......, (b) cathode, (c) both anode and cathode, 29. Which of the following is the definition of oxidation ?, (a) gain of electrons, (c) addition of hydrogen, 30. When the current is passed through an electrolytic solution, which of the following p, (d) in electrolytic solution, VoT loss of electrons, (d) removable of oxygen, will occur ?, Var anions move towards anode and cations move towards cathode, (b) cations and anions both move towards anode, (c) cations and anions both move towards cathode, (d) anions move towards cathode and cations move towards anode, 31. Which of the following conduct electricity due to migration of electrons only?, vaT copper metal, (c) solid NaCl, (b) fused NaCl, (d) solution of NaCl
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Basic Science: Chemistry, The substances through which electric current can pass are called ....., 2.51, Metal Corrosion, Its Prevention..., (a) insulators, (c) cathode, a Metallic conductors conduct electricity, (0) with chemical change, Vot conductors, (d) anode, (c) both (a) and (b), 24 The flow of electrons is called as, 465 without any chemical change, (d) none of these, X electrolyte, JoT electric current, (c) cathode, 35. A substance which in molten state or in solution form allows electric current to pass, through it is called as, Jas electrolyte, (c) conduction, 36. In electrochemical cell, the electrode at which reduction occurs is called ...., (d) anode, A insulator, (d) none of these, (a) anode, b cathode, (c) electrolyte, (d) electrolysis, 37. The process in which an ionic compound when fused or dissolved in water splits up into, charged particles is called as, (a) electrolysis, (c) hydration, 38. The metallic conductors in contact with the solution are called, os ionization, (d) conduction, (a) insulators, o) electrodes, (c) electrolytes, 39. The branch of chemistry which deals with the relationship between electricity and, chemical reaction is called as, (d) cells, br electrochemistry, (d) environmental chemistry, (a) chemical kinetics, (c) thermochemistry, 40. Greater the value of standard reduction potential of a species indicates., greater its tendency to accept electrons, (b) lesser tendency to accept electrons, (C) greater tendency to lose electrons, (d) none of these, (Hint: Since reduction is gain of electrons.), 41. According to Faraday's first law of electrolysis, the amount of any substance deposited at, the electrode is directly proportional to the quantity of, (a) voltage drop, Jer electricity passed, (b) resistance, (d) conductivity
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of the substance deposited by, 42 Electrochemical equivalent may be defined as the, passage of 1 coulomb of electricity., (a) volume, 467 weight, (o density, 43. 1 Foraday is, (a) 1 coulomb, (c) 5900 coulomb, (d) quantity, (b) 1000 coulomb, YOT 96500 coulomb, 44. According to Faraday's second law, the weight of different substances deposited by t, possage of same quantity of electricity is proportional to their, JaT chemical equivalent weight, (c) electrochemical equivalent weight, 45. In Daniel cell, porous partition acts as/....., ......, (b) current supply, (d) volume., (a) cathode, er salt bridge, 46. Daniel cell is an example of ...., Lay primary cell, (c) fuel cell, 47. Secondary cells, (a) cannot be recharged and reused, (c) have shorter life, 48. The equivalent weight of a substance can be calculated with the help of......, (a) Faraday's first law, (c) Daniel cell, 49. Electrorefining of metal is ..., Va purification of metal, (c) fabrication of metal, 50. Electroplating is done to achieve ...., (a) decoration, (b) anode, (d) electrolyte, (b) secondary cell, (d) none of these, 40T can be recharged and reused, (d) have irreversible chemical reaction, 6Y Faraday's second law, (d) battery, (b) extraction of metal, (d) metallurgy of metal, (b) corrosion resistance, (c) improving conduction, Var all of the above, Answers, 1. (d), 2. (c), 3. (b), 4. (d), 5. (c), 6. (b), 7. (a), 8. (c), 9. (c), 10. (b), 11. (b) 12. (d) 13. (b) 14. (a) 15. (d), 16. (a) 17. (c), 18. (c), 19. (a) 20. (c), 26. (a) 27. (b) 28. (a) 29. (b) 30. (a), 31. (a) 32. (b) 33. (b) 34. (b) 35. (a) 36. (b) 37. (b) 38. (b) 39. (b) 40. (a), 21. (b) 22. (a) 23. (a) 24. (c) 25. (a), 41. (c) 42. (b) 43. (d), 44. (a) 45. (c) 46. (a) 47. (b) 48. (b) 49. (a) 50. (d)
