Electrochemistry Quizzes: Master Electrochemistry Concepts

Question 1

How does the surface area of the electrodes affect the rate of an electrochemical reaction?

Accepted Answer

The reaction rate is directly proportional to the surface area of the electrodes.

Answer

The reaction rate is inversely proportional to the surface area of the electrodes.

Answer

The surface area of the electrodes has no impact on the reaction rate.

Answer

The reaction rate is directly proportional to the square of the surface area of the electrodes.

Question 2

How does electrochemistry contribute to mitigating environmental concerns?

Accepted Answer

Electrochemistry aids in designing efficient electrode materials for water splitting, enabling the production of clean hydrogen fuel.

Answer

Electrochemistry primarily focuses on studying corrosion and its impact on metal surfaces.

Answer

Electrochemical processes are solely employed in the production of batteries and fuel cells.

Question 3

What is the core concept that electrochemistry is built upon?

Accepted Answer

Electrochemistry: the scientific study of the relationship between electrical phenomena and chemical processes.

Answer

Electrochemistry focuses on using electrical energy to trigger chemical reactions, and vice versa.

Answer

Electrochemistry is the study of oxidation-reduction reactions in solutions.

Answer

Electrochemistry deals exclusively with aqueous solutions and the electrical properties of ions.

Question 4

To minimize overpotential in electrochemical reactions, which strategies are employed? Explain their significance.

Accepted Answer

Employing catalysts to reduce activation energy.

Accepted Answer

Utilizing electrodes with a larger surface area.

Answer

Increasing the concentration of reactants.

Answer

Lowering the temperature of the reaction.

Question 5

Define an electrochemical cell.

Accepted Answer

A device that converts chemical energy into electrical energy

Answer

A device that converts electrical energy into chemical energy

Answer

A device that converts thermal energy into electrical energy

Answer

A device that converts electrical energy into thermal energy

Question 6

Which electrode is the anode in a galvanic cell?

Accepted Answer

The electrode where oxidation occurs

Answer

The electrode where reduction occurs

Answer

The electrode connected to the positive terminal

Answer

The electrode connected to the negative terminal

Question 7

What are the products of the electrolysis of water?

Accepted Answer

Hydrogen and oxygen

Answer

Hydrogen and chlorine

Answer

Oxygen and chlorine

Answer

Sodium and hydroxide ions

Question 8

Differentiate between a primary and a secondary battery.

Accepted Answer

Secondary batteries can be recharged, while primary batteries cannot

Answer

Primary batteries can be recharged, while secondary batteries cannot

Answer

Primary batteries have a higher energy density than secondary batteries

Answer

Secondary batteries have a higher energy density than primary batteries

Question 9

What is the standard reduction potential of the standard hydrogen electrode (SHE)?

Accepted Answer

0.00 V

Answer

1.00 V

Answer

2.00 V

Answer

3.00 V

Question 10

In a galvanic cell, the anode is where:

Accepted Answer

Oxidation occurs and electrons are released

Answer

Reduction occurs and electrons are released

Answer

Oxidation occurs and electrons are consumed

Answer

Reduction occurs and electrons are consumed

Question 11

What is the primary purpose of a salt bridge in an electrochemical cell?

Accepted Answer

To provide a pathway for ions to move between the electrodes

Answer

To allow electrons to flow between the electrodes

Answer

To prevent the buildup of charge at the electrodes

Answer

To act as a catalyst for the redox reaction

Question 12

During the operation of an electrochemical cell, oxidation occurs at which electrode?

Accepted Answer

Anode

Answer

Cathode

Answer

Salt bridge

Answer

Half-cell

Question 13

Which of the following is the definition of a galvanic cell?

Accepted Answer

A cell that produces electricity from a spontaneous redox reaction

Answer

A cell that uses electricity to drive a non-spontaneous redox reaction

Answer

A cell with a positive electrode and a negative electrode

Answer

A cell with two identical electrodes

Question 14

What is the primary purpose of a salt bridge in an electrochemical cell?

Accepted Answer

To maintain electrical neutrality in the cell

Answer

To allow electrons to flow between half-cells

Answer

To prevent mixing of solutions between half-cells

Answer

To act as a catalyst for the redox reaction

Question 15

What is the main function of a battery?

Accepted Answer

To store chemical energy and convert it to electrical energy on demand

Answer

To store electrical energy and convert it to chemical energy

Answer

To generate heat

Answer

To produce light

Question 16

What is the universally accepted standard reduction potential for the hydrogen electrode?

Accepted Answer

0.00 V

Answer

+1.00 V

Answer

-1.00 V

Answer

+2.00 V

Question 17

What is the primary purpose of the Nernst equation?

Accepted Answer

Calculating cell potential under non-standard conditions

Answer

Determining the equilibrium constant for a redox reaction

Answer

Predicting the rate constant for a redox reaction

Answer

Measuring the standard reduction potential of an electrode

Question 18

What is the standard electrode potential of the standard hydrogen electrode?

Accepted Answer

0 V

Answer

1 V

Answer

-1 V

Answer

1.23 V

Question 19

Which of the following is NOT a type of electrochemical cell?

Accepted Answer

Solar cell

Answer

Galvanic cell

Answer

Electrolytic cell

Answer

Fuel cell

Question 20

Which material typically exhibits high electrical conductivity?

Accepted Answer

Metals

Answer

Gases

Answer

Insulators

Answer

Electrolytes

Question 21

What is the primary function of a potentiometer in electrochemical experiments?

Accepted Answer

Measuring electrode potential differences

Answer

Controlling current flow in circuits

Answer

Generating voltage

Answer

Amplifying signals

Question 22

What is the purpose of the salt bridge in an electrochemical cell?

Accepted Answer

To allow ion flow between half-cells

Answer

To prevent solution mixing

Answer

To act as an electron source

Answer

To measure cell potential

Question 23

What is the electrolyte's role in an electrochemical cell?

Accepted Answer

Conducts ions

Answer

Conducts electrons

Answer

Provides a physical barrier between half-cells

Answer

Absorbs heat from the reaction

Question 24

In a lead-acid battery, which metal serves as the anode?

Accepted Answer

Lead

Answer

Carbon

Answer

Copper

Answer

Aluminium

Question 25

Which of the following is a characteristic of a spontaneous redox reaction?

Accepted Answer

Positive standard cell potential (E°cell)

Answer

Negative standard cell potential (E°cell)

Answer

Zero standard cell potential (E°cell)

Answer

Equilibrium standard cell potential (E°cell)

Question 26

Which of the following is an example of a fuel cell?

Accepted Answer

Hydrogen-oxygen fuel cell

Answer

Lead-acid battery

Answer

Lithium-ion battery

Answer

Solar cell

Question 27

What is the primary role of the cathode in an electrochemical cell?

Accepted Answer

To consume electrons

Answer

To attract positive ions

Answer

To attract negative ions

Answer

To release electrons

Question 28

What is the key difference between a primary and a secondary battery?

Accepted Answer

Secondary batteries are rechargeable, while primary batteries are not

Answer

Primary batteries are rechargeable, while secondary batteries are not

Answer

Primary batteries have a higher energy density than secondary batteries

Answer

Secondary batteries have a higher energy density than primary batteries

Question 29

What is the primary purpose of an anode in an electrochemical cell?

Accepted Answer

To release electrons

Answer

To attract positive ions

Answer

To attract negative ions

Answer

To consume electrons

Question 30

Consider a cell reaction with a negative cell potential. What is the nature of the reaction?

Accepted Answer

Non-spontaneous and requires an external energy input to proceed

Answer

Spontaneous and occurs without an external energy input

Question 31

In a galvanic cell, where does oxidation take place?

Accepted Answer

Anode

Answer

Cathode

Question 32

Which type of electrode is used in a pH meter to measure acidity or alkalinity of a solution?

Accepted Answer

Glass electrode

Answer

Calomel electrode

Question 33

Identify the spontaneous redox reaction among the following options:

Accepted Answer

Zn + Cu2+ → Zn2+ + Cu

Answer

Fe3+ + e- → Fe2+

Answer

2H2O → O2 + 4H+ + 4e-

Answer

Fe2+ + 2e- → Fe

Question 34

What is the function of the salt bridge in an electrochemical cell?

Accepted Answer

To maintain electrical neutrality in the cell

Answer

To allow the flow of electrons between the electrodes

Answer

To prevent the mixing of the solutions in the half-cells

Answer

To act as a catalyst for the redox reaction

Question 35

Describe the role of a platinum electrode in a hydrogen fuel cell.

Accepted Answer

To act as a catalyst for the hydrogen oxidation reaction

Answer

To prevent the hydrogen from reacting with the oxygen

Answer

To generate electricity from the hydrogen

Answer

To measure the pH of the electrolyte

Question 36

In a galvanic cell, the flow of electrons is?

Accepted Answer

From the anode to the cathode

Answer

From the cathode to the anode

Question 37

The standard reduction potential of a hydrogen electrode in the SHE is:

Accepted Answer

0 V

Answer

1 V

Question 38

What is the primary function of a salt bridge in an electrochemical cell?

Accepted Answer

To complete the electrical circuit

Answer

To prevent the mixing of solutions

Question 39

The type of electrode used in the industrial production of chlorine gas is:

Accepted Answer

Platinum

Answer

Copper

Question 40

The half-reaction that occurs at the anode during the electrolysis of water is:

Accepted Answer

2H₂O(l) → O₂(g) + 4H⁺(aq) + 4e⁻

Answer

2H₂O(l) + 2e⁻ → H₂(g) + 2OH⁻(aq)

Question 41

Which of the following is the standard reduction potential of the hydrogen half-cell under standard conditions (298 K and 1 atm)?

Accepted Answer

0.00 V

Answer

1.00 V

Answer

-1.00 V

Answer

0.76 V

Question 42

In a galvanic cell, which electrode is the anode?

Accepted Answer

The electrode where oxidation occurs

Answer

The electrode where reduction occurs

Answer

The positive electrode

Answer

The negative electrode

Question 43

What is the primary purpose of a salt bridge in an electrochemical cell?

Accepted Answer

To allow ions to flow between the two half-cells

Answer

To prevent ions from flowing between the two half-cells

Answer

To complete the electrical circuit

Answer

To generate electrons

Question 44

Which of the following is an example of an electrolytic cell?

Accepted Answer

Electroplating cell

Answer

Car battery

Answer

Fuel cell

Answer

Solar cell

Question 45

What is the main function of a fuel cell?

Accepted Answer

To generate electricity from chemical fuels

Answer

To store electrical energy

Answer

To convert mechanical energy into electrical energy

Answer

To oxidize fuels

Question 46

In the redox reaction Fe2+ → Fe3+ + e-, which species is oxidized?

Accepted Answer

Fe2+

Answer

Fe3+

Answer

e-

Question 47

Which statement about batteries is correct?

Accepted Answer

Batteries store chemical energy and convert it into electrical energy.

Answer

Batteries can only be used once before disposal.

Answer

All batteries are rechargeable.

Answer

Batteries produce no waste products.

Question 48

Which factor is not included in the Nernst equation?

Accepted Answer

Surface area of electrodes

Answer

Temperature

Answer

Concentration of reactants

Answer

Number of electrons transferred

Question 49

What is the standard reduction potential of the half-reaction: Fe3+ + e- → Fe2+?

Accepted Answer

-0.771 V

Answer

+0.771 V

Answer

-0.036 V

Answer

+0.036 V

Question 50

What is the primary function of a salt bridge in an electrochemical cell?

Accepted Answer

To maintain charge balance

Answer

To prevent the mixing of solutions

Answer

To serve as a source of electrons

Answer

To increase the rate of reaction

Question 51

In a galvanic cell, which electrode is the anode?

Accepted Answer

Electrode where oxidation occurs

Answer

Positive electrode

Answer

Negative electrode

Answer

Electrode where reduction occurs

Question 52

What is the primary purpose of a fuel cell?

Accepted Answer

To convert chemical energy into electrical energy

Answer

To store electrical energy

Answer

To produce hydrogen gas

Answer

To separate oxygen and hydrogen

Question 53

Under standard conditions, the electrode potential of the standard hydrogen electrode is:

Accepted Answer

0.00 V

Answer

+0.76 V

Answer

-0.76 V

Question 54

What is the purpose of the salt bridge in an electrochemical cell?

Accepted Answer

To maintain electrical neutrality and allow the flow of ions between the two half-cells.

Answer

To prevent the mixing of the two solutions.

Answer

To increase the rate of the chemical reaction.

Question 55

The main products of the electrolysis of water are:

Accepted Answer

Hydrogen and oxygen

Answer

Copper and zinc

Answer

Sodium hydroxide and chlorine

Question 56

Which of the following processes involves the gain of electrons?

Accepted Answer

Reduction

Answer

Electrolysis

Answer

Oxidation

Question 57

The half-reaction for the oxidation of iron is:

Accepted Answer

Fe → Fe2+ + 2e-

Answer

Fe → Fe3+ + 2e-

Answer

Fe2+ + 2e- → Fe

Answer

Fe2- + 2e- → Fe

Question 58

The standard reduction potential of a half-reaction is a measure of:

Accepted Answer

The tendency of a species to undergo reduction under standard conditions.

Answer

The potential difference between the anode and cathode in an electrochemical cell.

Answer

The tendency of a species to undergo oxidation under standard conditions.

Question 59

Which of the following is a characteristic of a spontaneous reaction?

Accepted Answer

A positive cell potential

Answer

High activation energy

Answer

Exothermic nature

Answer

A negative cell potential

Question 60

Which of the following is the standard reduction potential for the standard hydrogen electrode?

Accepted Answer

0.00 V

Answer

1.00 V

Answer

0.50 V

Answer

-1.00 V

Question 61

In a galvanic cell, which electrode undergoes oxidation?

Accepted Answer

Anode

Answer

Salt bridge

Answer

Half-cell

Answer

Cathode

Question 62

The products of the electrolysis of molten sodium chloride are:

Accepted Answer

Sodium and chlorine gas

Answer

Sodium and hydrogen gas

Answer

Hydrogen and chlorine gas

Answer

Chlorine and hydrogen gas

Question 63

Which type of battery is a primary battery?

Accepted Answer

Zinc-carbon battery

Answer

Lithium-ion battery

Answer

Fuel cell

Answer

Lead-acid battery

Question 64

In a fuel cell, the anode is the site of:

Accepted Answer

Oxidation

Answer

Reduction

Answer

Both oxidation and reduction