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AP ECET CHEMISTRY Multiple Choice Questions (MCQs)

AP ECET Chemistry - Electrochemistry MCQs

61. Which of the following materials is an example of an insulator?

a) Copper

b) Water

c) Rubber

d) Aluminum

Answer: c) Rubber

62. Which of the following is a property of an electrolyte?

a) It does not conduct electricity in molten or dissolved state

b) It conducts electricity in molten or dissolved state

c) It is always a solid

d) It is always a non-metal

Answer: b) It conducts electricity in molten or dissolved state

63. What is the primary product formed at the cathode during electrolysis?

a) Positive ions

b) Negative ions

c) Oxidized ions

d) Reduced ions

Answer: d) Reduced ions

64. Faraday's first law of electrolysis states that:

a) The mass of the substance deposited is directly proportional to the charge

b) The mass of the substance deposited is directly proportional to the current

c) The mass of the substance deposited is inversely proportional to the voltage

d) None of the above

Answer: a) The mass of the substance deposited is directly proportional to the charge

65. Faraday’s second law of electrolysis relates to:

a) The current passing through the electrolyte

b) The volume of the gases liberated

c) The mass of different substances deposited

d) The temperature of the electrolyte

Answer: c) The mass of different substances deposited

66. What is the unit of electrical charge used in Faraday’s law of electrolysis?

a) Coulomb (C)

b) Ampere (A)

c) Volt (V)

d) Watt (W)

Answer: a) Coulomb (C)

67. Which of the following is true regarding a Galvanic cell?

a) It converts electrical energy into chemical energy

b) It is a type of electrolytic cell

c) It converts chemical energy into electrical energy

d) It does not involve redox reactions

Answer: c) It converts chemical energy into electrical energy

68. In a Galvanic cell, the electrode where oxidation occurs is called the:

a) Cathode

b) Anode

c) Electrolyte

d) None of the above

Answer: b) Anode

69. The standard electrode potential (E°) is defined as:

a) The potential difference between two half-cells

b) The potential of a half-cell measured under standard conditions relative to the standard hydrogen electrode (SHE)

c) The potential difference across a galvanic cell

d) The voltage across the electrolytic cell

Answer: b) The potential of a half-cell measured under standard conditions relative to the standard hydrogen electrode (SHE)

70. The electrochemical series lists:

a) The strength of acids

b) The solubility of salts

c) The standard electrode potentials of different half-cells

d) The density of electrolytes

Answer: c) The standard electrode potentials of different half-cells

71. The emf (electromotive force) of a cell is the:

a) Difference in potential between the two electrodes

b) Current flowing through the circuit

c) Temperature of the electrolyte

d) Amount of substance deposited

Answer: a) Difference in potential between the two electrodes

72. In a Daniel cell, the standard electrode potential for Zn²⁺/Zn is -0.76 V. The standard electrode potential for Cu²⁺/Cu is +0.34 V. The emf of the cell is:

a) 1.10 V

b) -1.10 V

c) 0.42 V

d) 0.56 V

Answer: a) 1.10 V

73. If the emf of a cell is negative, it indicates:

a) The cell is in a spontaneous reaction

b) The cell is not functioning

c) The cell is undergoing a non-spontaneous reaction

d) The anode and cathode have the same potential

Answer: c) The cell is undergoing a non-spontaneous reaction

74. The Nernst equation is used to calculate:

a) The rate of reaction in electrolysis

b) The emf of a cell under non-standard conditions

c) The concentration of electrolyte

d) The temperature dependence of electrochemical reactions

Answer: b) The emf of a cell under non-standard conditions

75. Which of the following is the correct relationship for calculating the emf of a cell using the Nernst equation?

a) E = E° - (RT/nF) * ln Q

b) E = E° + (RT/nF) * ln Q

c) E = E° - (nF/RT) * ln Q

d) E = E° + (nF/RT) * ln Q

Answer: b) E = E° + (RT/nF) * ln Q

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AP ECET CHEMISTRY Multiple Choice Questions (MCQs)

AP ECET Chemistry - Electrochemistry MCQs

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