Free Electrochemistry MCQs with Answers
696 Electrochemistry MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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Read the Electrochemistry notesFree MDCAT chapter notes with key terms696 questions · page 15 of 35
- A. Copper Sulphate
- B. Copper chloride
- C. Zinc Chloride
- D. Zinc Sulphate
Explanation: Option A: Copper sulfate (CuSO4) is a compound that contains copper and sulfur.
Correct answer: Zinc Sulphate- A. Plasma state
- B. Solution or Fused state
- C. Solid form
- D. Gaseous State
Explanation: Option A: Plasma is a high-energy state of matter composed of ionized gas.
Correct answer: Solution or Fused state- A. A beaker
- B. Flask
- C. Evaporating Dish
- D. Electrolytic Cell
Explanation: Option A: A beaker is a common laboratory container used for holding and mixing liquids.
Correct answer: Electrolytic Cell- A. 2 Volts
- B. 2.2 Volts
- C. 1 Volt
- D. 1.1 volt
Explanation: For a Voltaic Cell containing Zn and Copper electrodes, the cell potential at standard conditions is always 1.1 V.
Correct answer: 1.1 volt- A. Sodium
- B. Magnesium
- C. Aluminum
- D. Iron
Explanation: Fused bauxite, which is a mixture of aluminum oxide (Al2O3), iron oxide (Fe2O3), and other impurities, is electrolyzed to produce pure…
Correct answer: Aluminum- A. Haber's Process
- B. Born-Haber cycle
- C. Ion Exchange Method
- D. Hall-Heroult Process
Explanation: The electrolysis of bauxite is done by the Hall-Heroult process. This process is named after Charles Martin Hall and Paul L.
Correct answer: Hall-Heroult Process- A. Anode
- B. Cathode
- C. Toward the bottom of the cell
- D. Towards the walls of the cell
Explanation: In an electrochemical cell, positive ions are migrated towards the cathode.
Correct answer: Cathode- A. Highly conductive path
- B. To balance amount of negative and positive ions in both half-cells
- C. Both Options A and B are correct
- D. To increase resistivity
Explanation: OPTION A: The salt bridge is used in electrochemical cells to provide a highly conductive path between the two half-cells.
Correct answer: Both Options A and B are correct- A. Hydrogen gas
- B. Hydrogen atoms and Water
- C. H+ ion
- D. OH- ion
Explanation: OPTION A: Hydrogen gas is not formed directly from hydronium ions. Hydrogen gas is produced through the electrolysis of water or the…
Correct answer: Hydrogen atoms and Water- A. Potential energy
- B. Chemical energy of ions
- C. Kinetic Energy
- D. Free Electrons
Explanation: A voltaic cell produces electrical energy from chemical energy. A voltaic cell is a type of electrochemical cell that converts chemical…
Correct answer: Chemical energy of ions- A. Changing the the positions of electrodes
- B. Replacing the salt bridge with a wire
- C. Providing an external source of electricity
- D. All of these options are correct
Explanation: The correct option is: All of these options are correct. A voltaic cell can be converted into a reverse galvanic cell by doing any or all…
Correct answer: All of these options are correct292. Electrolysis is a ?
- A. Spontaneous Reaction
- B. Oxidation-reduction reaction
- C. Reduction Reaction
- D. Oxidation Reaction
Explanation: The basis of electrolysis is the concept of a series of "oxidation-reduction" reactions known as redox reactions.
Correct answer: Oxidation-reduction reaction- A. Producing electrons
- B. Circuit completion
- C. Increasing the speed of electrons
- D. All of these options are correct
Explanation: The purpose of the salt bridge is to act as a source of spectator ions that can migrate into each of the half cells to preserve…
Correct answer: Circuit completion- A. At the start of procedure
- B. Somewhere in the middle of balancing
- C. After adding the two half reactions
- D. Before adding the two half reactions
Explanation: The electrons are balanced after you have added the two half-reactions together to form the balanced overall redox reaction.
Correct answer: Before adding the two half reactions- A. Anode
- B. Cathode
- C. At the surface of electrolyte
- D. None of these
Explanation: In an electrochemical cell, the cathode (+) is the one that gains electrons hence the element that is being reduced gains electrons.
Correct answer: Cathode- A. Aqueous Calcium Chloride
- B. Molten zinc powder
- C. KCl in a gel
- D. NaCl in a gel
Explanation: A saturated solution of KCl is used in making salt bridges. Because it is relatively inert.
Correct answer: KCl in a gel- A. Discharged at anode
- B. Discharged at cathode
- C. Does not discharge
- D. None of these options is correct
Explanation: Once it's aqueous, the Na+ and NO3- will compete with water which is H2O.
Correct answer: Does not discharge- A. Aqueous NaCl
- B. Aqueous NaNO3
- C. Fused NaCl
- D. Fused NaNO3
Explanation: A Down's cell is used for the electrolysis of molten sodium chloride. The battery must supply over 4 volts to carry out this electrolysis.
Correct answer: Fused NaCl- A. Positive
- B. Zero
- C. Negative
- D. All of these options are correct
Explanation: Oxidation numbers represent the number of electrons lost by an element or a compound. Hence, it can be any number from 0 onwards.
Correct answer: All of these options are correct- A. Negative charge
- B. Net positive charge
- C. Neutral charge
- D. None of these options are correct
Explanation: The left half cell consists of a zinc electrode and a solution of zinc sulfate, the right half cell of a copper electrode and a solution…
Correct answer: Net positive charge