Electrochemistry mcqs for army navy paf

Electrochemistry MCQs with Answers

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Electrochemistry MCQs (Part-1)

Q. A(n) _____ reaction is a chemical reaction in which energy is absorbed from the environment.

  • a) exothermic
  • b) endothermic
  • c) spontaneous
  • d) catalytic
    Correct answer: b) endothermic

Q. The species that loses electrons in the redox reaction is said to be _____.

  • a) reduced
  • b) oxidized
  • c) catalyzed
  • d) balanced
    Correct answer: b) oxidized

Q. The species that gains electrons in a redox reaction is ____________.

  • a) oxidized
  • b) reduced
  • c) neutralized
  • d) activated
    Correct answer: b) reduced

Q.The oxidation state of an element in its elemental form is always ____________.

  • a) positive
  • b) zero
  • c) negative
  • d) variable
    Correct answer: b) zero

Q.In a reaction, the reducing agent is a species that forms ____________ electrons.

  • a) donates
  • b) accepts
  • c) loses
  • d) neutralizes
    Correct answer: a) donates

Q.In the reaction, the oxidizing agent is a species that forms ____________ electrons.

  • a) donates
  • b) accepts
  • c) loses
  • d) neutralizes
    Correct answer: b) accepts

Q.A half-reaction that involves the loss of electrons is called a ____________ half-reaction.

  • a) reduction
  • b) oxidation
  • c) redox
  • d) catalytic
    Correct answer: b) oxidation

Q.A half-reaction that involves a gain of electrons is called a ____________ half-reaction.

  • a) oxidation
  • b) reduction
  • c) redox
  • d) catalytic
    Correct answer: b) reduction

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Electrochemistry MCQs (Part-2)

Q.In a redox reaction, electrons are transferred from an oxygen species to a species that is ____________.

  • a) oxidized
  • b) reduced
  • c) stabilized
  • d) neutralized
    Correct answer: b) reduced

Q.The total number of electrons lost in the oxidation half-reaction must equal the total number of electrons in the reduction half-reaction ____________.

  • a) balanced
  • b) gained
  • c) stabilized
  • d) transferred
    Correct answer: b) gained

Q.The oxidation state of oxygen in most compounds is ____________.

  • a) +1
  • b) -1
  • c) -2
  • d) 0
    Correct answer: c) -2

Q.The oxidation state of hydrogen in most compounds is ____________.

  • a) +1
  • b) -1
  • c) -2
  • d) 0
    Correct answer: a) +1

Q.In the balanced equation of a reduction reaction, the total increase in the oxidation number of the oxygen species must equal the increase in the total oxidation number of the species that is _____.

  • a) oxidized
  • b) reduced
  • c) neutralized
  • d) stabilized
    Correct answer: b) reduced

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Electrochemistry MCQs with Free Answers

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Electrochemistry MCQs (Part-3)

Q.An electrochemical series is a list of elements ordered by their ____________ potentials. (standard)

  • a) reduction
  • b) oxidation
  • c) equilibrium
  • d) standard
  • Correct answer: d) standard

Q.In a redox reaction, species with a higher standard reduction potential form ____________ electrons. (reinforcement)

  • a) donate
  • b) accept
  • c) release
  • d) neutralize
  • Correct answer: a) donate

Q.A(n) ____________ element is an electrochemical element that transforms chemical energy into electrical energy. (galvanic/voltaic)

  • a) voltaic
  • b) galvanic
  • c) electrolytic
  • d) thermodynamic
  • Correct answer: b) galvanic

Q.The electrode where oxidation occurs in an electrochemical cell is called a ____________ electrode. (anode)

  • a) cathode
  • b) negative
  • c) reduction
  • d) anode
  • Correct answer: d) anode

Q.The electrode where reduction occurs in an electrochemical cell is called a ____________ electrode. (cathode)

  • a) anode
  • b) positive
  • c) oxidation
  • d) cathode
  • Correct answer: d) cathode

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Electrochemistry MCQs (Part-4)

Q.In an electrochemical cell, ____________ ions move from the anode to the cathode through the electrolyte. (cation/positive)

  • a) anion
  • b) cation
  • c) neutral
  • d) positive
  • Correct answer: b) cation

Q.___________ ion flow through the external circuit is responsible for the electric current in the electrochemical cell. (electrons)

  • a) Proton
  • b) Electron
  • c) Anion
  • d) Cation
  • Correct answer: b) Electron

Q.________ is the tendency of a species to gain or lose electrons during a redox reaction. (standard electrode potential)

  • a) Electromotive force
  • b) Standard potential
  • c) Electrode potential
  • d) Redox potential
  • Correct answer: d) Redox potential

Q.__________ equation relates the standard electrode potential of a cell to the concentrations of replicates and products. (Nernst)

  • a) Nernst-Miller
  • b) Nernst-Planck
  • c) Nernst-Redlich
  • d) Nernst equation
  • Correct answer: d) Nernst equation

Q.The equation ____________ can be used to calculate the cell potential under non-standard conditions. (Nernst)

  • a) Henderson-Hasselbalch
  • b) Gibbs free energy
  • c) Arrhenius
  • d) Nernst
  • Correct answer: d) Nernst

Q.The electromotive force (EMF) of an electrochemical cell is a measure of its ____________. (cell potential)

  • a) Thermodynamic stability
  • b) Electrolytic activity
  • c) Chemical equilibrium
  • d) Cell potential
  • Correct answer: d) Cell potential

Q.________ notation is used to describe the components and conditions of an electrochemical cell. (cell label)

  • a) Cell structure
  • b) Cell potential
  • c) Cell notation
  • d) Cell configuration
  • Correct answer: c) Cell notation

Q.Vertical line “|” in a cell label represents ____________. (phase boundary)

  • a) Solid boundary
  • b) Liquid boundary
  • c) Gas boundary
  • d) Phase boundary
  • Correct answer: d) Phase boundary

Q.One vertical line in the cell label represents the ____________ bond. (fixed)

  • a) Ionic
  • b) Covalent
  • c) Metallic
  • d) Fixed
  • Correct answer: d) Fixed

Q.The double vertical line in the cell label represents the ____________ connection. (liquid)

  • a) Solid
  • b) Liquid
  • c) Gas
  • d) Aqueous
  • Correct answer: b) Liquid

Q.A comma “,” in a cell label indicates a ____________ connection. (gas)

  • a) Solid
  • b) Liquid
  • c) Gas
  • d) Aqueous
  • Correct answer: c) Gas

Q.The ____________ law of electrolysis states that the amount of substance produced at the electrode is directly proportional to the amount of electricity passing through it. (Faraday)

  • a) Faraday’s
  • b) Coulomb’s
  • c) Lenz’s
  • d) Ohm’s
  • Correct answer: a) Faraday’s

Q.A battery is an electrochemical device that converts ____________ energy into electrical energy. (chemical)

  • a) Potential
  • b) Thermal
  • c) Chemical
  • d) Kinetic
  • Correct answer: c) Chemical

Q.In a battery, the ____________ reaction occurs at the anode. (oxidation)

  • a) Reduction
  • b) Oxidation
  • c) Neutralization
  • d) Dissociation
  • Correct answer: b) Oxidation

Q.In a battery, the ____________ reaction occurs at the cathode. (reduction)

  • a) Reduction
  • b) Oxidation
  • c) Neutralization
  • d) Dissociation
  • Correct answer: a) Reduction

Q._______ is the part of the battery where the electrochemical reactions take place. (element)

  • a) Electrode
  • b) Element
  • c) Reactant
  • d) Electrolyte
  • Correct answer: a) Electrode

Q.The ____________ of a battery is a measure of its electrical potential difference. (voltage)

  • a) Amperage
  • b) Resistance
  • c) Voltage
  • d) Current
  • Correct answer: c) Voltage

Q.________ battery is a type of battery that uses a reversible redox reaction to store and release electrical energy. (rechargeable)

  • a) Alkaline
  • b) Lead-acid
  • c) Nickel-cadmium
  • d) Rechargeable
  • Correct answer: d) Rechargeable

Q.A common example of a rechargeable battery is a ____________ battery. (lithium ion)

  • a) Zinc-carbon
  • b) Nickel-metal hydride
  • c) Lithium-ion
  • d) Alkaline
  • Correct answer: c) Lithium-ion

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Electrochemistry MCQs with Answers

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Electrochemistry MCQs (Part-5)

Q.________ is a type of battery commonly used in cars.

  • a) Lithium-ion
  • b) Nickel-metal hydride
  • c) Lead acid
  • d) Alkaline
  • Correct answer: c) Lead acid

Q.A fuel cell is an electrochemical device that converts ____________ energy into electrical energy.

  • a) Mechanical
  • b) Thermal
  • c) Chemical
  • d) Magnetic
  • Correct answer: c) Chemical

Q.In a fuel cell, the fuel (e.g., hydrogen) passes through ____________ at the anode.

  • a) Reduction
  • b) Electrolysis
  • c) Oxidation
  • d) Combustion
  • Correct answer: c) Oxidation

Q.In a fuel cell, ____________ (usually oxygen) is reduced at the cathode.

  • a) Nitrogen
  • b) Hydrogen
  • c) Carbon dioxide
  • d) Oxygen
  • Correct answer: d) Oxygen

Q.________ is an essential part of a fuel cell that allows ions to travel between the anode and cathode.

  • a) Catalyst
  • b) Electrode
  • c) Electrolyte
  • d) Conductor
  • Correct answer: c) Electrolyte

Electrochemistry MCQs (Part-6)

Q._______ fuel cell is a fuel cell that operates at high temperatures using a ceramic electrolyte.

  • a) Proton exchange membrane
  • b) Alkaline
  • c) Solid oxide
  • d) Molten carbonate
  • Correct answer: c) Solid oxide

Q._________ fuel cell is a fuel cell that operates at low temperatures and uses a polymer electrolyte.

  • a) Solid oxide
  • b) Alkaline
  • c) Molten carbonate
  • d) Polymer electrolyte membrane
  • Correct answer: d) Polymer electrolyte membrane

Q.A major advantage of fuel cells over batteries is that fuel cells can operate continuously as long as ____________ is continuously available.

  • a) Oxygen
  • b) Hydrogen
  • c) Electricity
  • d) Fuel
  • Correct answer: d) Fuel

Q._______ is a natural process that leads to the deterioration of metals as a result of chemical reactions with the environment.

  • a) Oxidation
  • b) Erosion
  • c) Corrosion
  • d) Rusting
  • Correct answer: c) Corrosion

Q._______ corrosion occurs when two dissimilar metals come into contact in the presence of an electrolyte.

  • a) Pitting
  • b) Uniform
  • c) Galvanic
  • d) Atmospheric

Correct answer: c) Galvanic

Q.Corrosion of iron in the presence of oxygen and water is generally known as ____________ corrosion.

  • a) Rust
  • b) Galvanic
  • c) Pitting
  • d) Atmospheric

Correct answer: a) Rust

Q.Corrosion is a ____________ process, which means it can be slowed or prevented by appropriate measures.

  • a) Physical
  • b) Biological
  • c) Chemical
  • d) Electrochemical

Correct answer: d) Electrochemical

Q._______ corrosion is a localized form of corrosion characterized by a highly localized defect in the metal surface.

  • a) Uniform
  • b) Atmospheric
  • c) Pitting
  • d) Galvanic

Correct answer: c) Pitting

Q.______ corrosion occurs when a metal is exposed to a corrosive environment and is weakened uniformly over its entire surface.

  • a) Pitting
  • b) Galvanic
  • c) Atmospheric
  • d) Uniform

Correct answer: d) Uniform

Q._________ corrosion occurs when a metal is exposed to alternating wet and dry conditions, resulting in accelerated corrosion.

  • a) Galvanic
  • b) Uniform
  • c) Atmospheric
  • d) Pitting

Correct answer: c) Atmospheric

Q._______ corrosion is a form of corrosion that occurs in the presence of acids or acidic solutions.

  • a) Alkaline
  • b) Chloride
  • c) Acid
  • d) Galvanic

Correct answer: c) Acid

Q.The process of applying a protective layer of a less reactive metal over a more reactive metal to prevent corrosion is called ____________.

  • a) Coating
  • b) Galvanization
  • c) Passivation
  • d) Anodizing

Correct answer: b) Galvanization

Q._________ corrosion is a form of corrosion that occurs in the presence of alkaline solutions.

  • a) Acid
  • b) Alkaline
  • c) Chloride
  • d) Pitting

Correct answer: b) Alkaline

Q._______ corrosion is a type of corrosion usually caused by chlorides found in salt water.

  • a) High temperature
  • b) Alkaline
  • c) Chloride
  • d) Galvanic

Correct answer: c) Chloride

Q.________ is a common corrosion prevention method that involves applying a protective coating to a metal surface.

  • a) Passivation
  • b) Anodizing
  • c) Galvanization
  • d) Coating

Correct answer: d) Coating

Q._______ corrosion is a type of corrosion that occurs in metals exposed to high temperatures.

  • a) Atmospheric
  • b) High temperature
  • c) Acid
  • d) Pitting

Correct answer: b) High temperature

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Electrochemistry MCQs for Free PDF

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By utilizing these Electrochemistry   MCQs, candidates can strengthen their grasp of essential Electrochemical concepts, such as electrode operations, redox reactions, and Electrochemical cells. The extensive covering of Electrochemistry MCQs guarantees that applicants are well-prepared for the challenges of their individual tests.

Electrochemistry MCQs (Part-7)

Q._________ is a form of corrosion caused by the presence of moisture and oxygen in the atmosphere.

  • a) Oxidation
  • b) Pitting
  • c) Galvanic
  • d) Uniform
  • Correct answer: a) Oxidation

Q.________ corrosion is a type of corrosion caused by microorganisms in metals.

  • a) Oxidation
  • b) Pitting
  • c) Galvanic
  • d) Microbiological
  • Correct answer: d) Microbiological

Q.Electrical conductivity is the ability of a material to conduct ____________.

  • a) Heat
  • b) Light
  • c) Sound
  • d) Electricity
  • Correct answer: d) Electricity

Q.In solution, the ions responsible for conducting electricity are called ____________ ions.

  • a) Mobile
  • b) Static
  • c) Stationary
  • d) Dynamic
  • Correct answer: a) Mobile

Q.The unit of electrical conductivity is ____________.

  • a) Ohms
  • b) Amperes
  • c) Siemens per meter
  • d) Volts
  • Correct answer: c) Siemens per meter

Q.In the electrolyte, ____________ ions are positively charged and move to the cathode during ion transport.

  • a) Anion
  • b) Cation
  • c) Neutral
  • d) Complex
  • Correct answer: b) Cation

Q.The movement of ions in an electric field is called ____________.

  • a) Ion transfer
  • b) Ion transition
  • c) Ion migration
  • d) Ion motion
  • Correct answer: c) Ion migration

Q._______ is a type of ion transport where ions move in response to an electric field.

  • a) Diffusion
  • b) Osmosis
  • c) Electrophoresis
  • d) Convection
  • Correct answer: c) Electrophoresis

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Electrochemistry MCQs (Part-8)

Q._________ is a device used to measure the electrical conductivity of a solution.

  • a) Voltmeter
  • b) Ammeter
  • c) Conductivity meter
  • d) Galvanometer
  • Correct answer: c) Conductivity meter

Q.________ measures how easily ions can move through a material.

  • a) Ionic mobility
  • b) Ionic conductivity
  • c) Ionic diffusivity
  • d) Ionic permeability
  • Correct answer: b) Ionic conductivity

Q._______ is a measure of a material’s resistance to ion transport.

  • a) Ionic resistance
  • b) Ionic impedance
  • c) Ionic resistivity
  • d) Ionic obstruction
  • Correct answer: c) Ionic resistivity

Q._______ is a measure of a material’s ability to resist an electric current.

  • a) Electric resistance
  • b) Electric impedance
  • c) Electric conductivity
  • d) Electric obstruction
  • Correct answer: a) Electric resistance

Q.In the electrolyte, ____________ ions are negatively charged and move to the anode during ion transport.

  • a) Cation
  • b) Anion
  • c) Neutral
  • d) Complex
  • Correct answer: b) Anion

Q.________ is a phenomenon where the electrical conductivity of a solution increases as the temperature increases.

  • a) Ion enhancement
  • b) Ion conduction
  • c) Ion excitation
  • d) Ion conduction
  • Correct answer: b) Ion conduction

Q.______ is a type of ion transport in which ions move in response to a concentration gradient.

  • a) Electrophoresis
  • b) Osmosis
  • c) Diffusion
  • d) Convection
  • Correct answer: c) Diffusion

Q.________ is a measure of a material’s ability to conduct electricity.

  • a) Conductivity
  • b) Resistance
  • c) Impedance
  • d) Conductance
  • Correct answer: a) Conductivity

Q._______ measures the ability of a material to transport ions.

  • a) Ion migration number
  • b) Ion transport number
  • c) Ion diffusion coefficient
  • d) Ion conductivity factor
  • Correct answer: b) Ion transport number

Q.The study of the rates of electrochemical reactions is known as ____________.

  • a) Electrochemical kinetics
  • b) Electrochemical dynamics
  • c) Electrochemical thermodynamics
  • d) Electrochemical equilibrium
  • Correct answer: a) Electrochemical kinetics

Q.______ is a measure of the ease and speed at which a redox reaction occurs.

  • a) Reaction rate
  • b) Reaction velocity
  • c) Reaction dynamics
  • d) Reaction speed
  • Correct answer: a) Reaction rate

Q._______ is the minimum amount of energy required for a reaction to occur.

  • a) Activation energy
  • b) Potential energy
  • c) Kinetic energy
  • d) Entropy
  • Correct answer: a) Activation energy

Q._______ is a measure of the speed of a reaction at a specific point in an electrochemical reaction.

  • a) Instantaneous rate
  • b) Average rate
  • c) Reaction rate constant
  • d) Rate of reaction
  • Correct answer: a) Instantaneous rate

Q.________ is a measure of the average rate of a reaction over a period of time.

  • a) Instantaneous rate
  • b) Reaction rate constant
  • c) Average rate
  • d) Rate of reaction
  • Correct answer: c) Average rate

Q._______ is a factor that affects the speed of an electrochemical reaction and represents the frequency and efficiency of collisions between the reacting species.

  • a) Collision frequency
  • b) Collision energy
  • c) Collision efficiency
  • d) Collision orientation
  • Correct answer: a) Collision frequency

Q.________ is a factor that affects the speed of an electrochemical reaction and represents the fraction of collisions that have enough energy to exceed the activation energy.

  • a) Collision frequency
  • b) Collision energy
  • c) Collision efficiency
  • d) Collision orientation
  • Correct answer: c) Collision efficiency

Q.______ is a factor that affects the speed of an electrochemical reaction and represents the orientation of the colliding particles.

  • a) Collision frequency
  • b) Collision energy
  • c) Collision efficiency
  • d) Collision orientation
  • Correct answer: d) Collision orientation

Q._______ is a measure of the sensitivity of the speed of reaction to changes in the concentration of the reactants.

  • a) Reaction rate constant
  • b) Rate equation
  • c) Rate law
  • d) Rate constant
  • Correct answer: d) Rate constant

Q.______ is an empirical equation that relates the speed of an electrochemical reaction to the concentrations of the reactants.

  • a) Reaction rate constant
  • b) Rate equation
  • c) Rate law
  • d) Rate constant
  • Correct answer: b) Rate equation

Q._______ is a term used to describe the dependence of the speed of a reaction on the concentration of reactant.

  • a) Rate constant
  • b) Rate equation
  • c) Rate law
  • d) Reaction rate
  • Correct answer: c) Rate law

Q._______ is the exponent to which the concentration of reactant is increased in the rate law.

  • a) Rate constant
  • b) Rate equation
  • c) Rate law
  • d) Reaction order
  • Correct answer: d) Reaction order

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Electrochemistry MCQs (Part-9)

Q._________ is the sum of the exponents in the rate equation of a reaction.

  • a) Overall order
  • b) Reaction order
  • c) General order
  • d) Combined order
  • Correct answer: a) Overall order

Q.________ is the proportionality constant in the rate law equation.

  • a) Equilibrium constant
  • b) Rate coefficient
  • c) Rate constant
  • d) Reaction constant
  • Correct answer: c) Rate constant

Q.__________ is an equation that relates the rate constant to the reaction temperature and activation energy.

  • a) Faraday’s law
  • b) Nernst equation
  • c) Arrhenius equation
  • d) Gibbs free energy equation
  • Correct answer: c) Arrhenius equation

Q.An electrode is a conductor through which ____________ enters or exits an electrochemical system.

  • a) Ions
  • b) Electrons
  • c) Protons
  • d) Neutrons
  • Correct answer: b) Electrons

Q.The electrode where oxidation takes place is called ____________.

  • a) Cathode
  • b) Anode
  • c) Diode
  • d) Triode
  • Correct answer: b) Anode

Q.The electrode where reduction occurs is called ____________.

  • a) Anode
  • b) Cathode
  • c) Diode
  • d) Triode
  • Correct answer: b) Cathode

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Electrochemistry MCQs (Part-10)

Q.___________ is the potential difference between the electrode and the solution in which it is immersed.

  • a) Electrode voltage
  • b) Electrode potential
  • c) Electrode charge
  • d) Electrode energy
  • Correct answer: b) Electrode potential

Q._______ is the electrode potential of an electrode compared to a standard hydrogen electrode (SHE) under standard conditions.

  • a) Absolute electrode potential
  • b) Relative electrode potential
  • c) Standard electrode potential
  • d) Potential difference
  • Correct answer: c) Standard electrode potential

Q.________ is the tendency of an electrode to gain or lose electrons and measures its ability to reduce or oxidize.

  • a) Reduction potential
  • b) Oxidation potential
  • c) Electromotive force
  • d) Galvanic potential
  • Correct answer: a) Reduction potential

Q.________ is a measure of how easily an electrode can be reduced in size.

  • a) Reduction potential
  • b) Oxidation potential
  • c) Electromotive force
  • d) Electrode potential
  • Correct answer: b) Oxidation potential

Q.________ is an easily measured indicator of electrode oxidation.

  • a) Reduction potential
  • b) Oxidation potential
  • c) Electromotive force
  • d) Electrode potential
  • Correct answer: b) Oxidation potential

Q.________ is a reference electrode commonly used in electrochemical measurements.

  • a) Standard hydrogen electrode (SHE)
  • b) Silver/silver chloride electrode
  • c) Calomel electrode
  • d) Quinhydronium electrode
  • Correct answer: a) Standard hydrogen electrode (SHE)

Q.________ is a reference electrode based on a redox couple between a silver electrode and a silver chloride solution.

  • a) Standard hydrogen electrode (SHE)
  • b) Silver/silver chloride electrode
  • c) Calomel electrode
  • d) Quinhydronium electrode
  • Correct answer: b) Silver/silver chloride electrode

Q._________ is a reference electrode based on a redox couple between a calomel electrode and a saturated potassium chloride solution.

  • a) Standard hydrogen electrode (SHE)
  • b) Silver/silver chloride electrode
  • c) Calomel electrode
  • d) Quinhydronium electrode
  • Correct answer: c) Calomel electrode

Q.__________ is a reference electrode based on a redox couple between a saturated quinhydrone solution and a quinhydrone electrode.

  • a) Standard hydrogen electrode (SHE)
  • b) Silver/silver chloride electrode
  • c) Calomel electrode
  • d) Quinhydronium electrode
  • Correct answer: d) Quinhydronium electrode

Q.________ is a measure of the flow of electrons between an electrode and a solution during an electrochemical reaction.

  • a) Current
  • b) Voltage
  • c) Resistance
  • d) Conductance
  • Correct answer: a) Current

Q.________ is a measure of the resistance to electron flow between the electrode and the solution.

  • a) Charge transfer resistance
  • b) Ionic resistance
  • c) Conductivity
  • d) Impedance
  • Correct answer: a) Charge transfer resistance

Q._______ is a measure of an electrode’s ability to move electrons into or out of an electrolyte solution.

  • a) Current density
  • b) Charge transfer resistance
  • c) Ion transport number
  • d) Faraday’s law
  • Correct answer: a) Current density

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