Electrochemistry: Master the Fundamentals with Interactive Quizzes

Question 1

In an electrochemical cell, which electrode is the site of oxidation?

Accepted Answer

Anode

Answer

Cathode

Answer

Salt bridge

Answer

Reference electrode

Question 2

Which of the following is the standard reduction potential of the hydrogen electrode at 25°C? (Use 96,485 Coulombs per mole of electrons)

Accepted Answer

0.00 V

Answer

1.00 V

Answer

-1.00 V

Answer

0.70 V

Question 3

In a galvanic cell, identify where oxidation occurs and the direction of electron flow:

Accepted Answer

Oxidation occurs at the anode with electrons flowing from the anode to the cathode.

Answer

Oxidation occurs at the cathode with electrons flowing from the cathode to the anode.

Answer

Reduction occurs at the anode with electrons flowing from the anode to the cathode.

Answer

Reduction occurs at the cathode with electrons flowing from the cathode to the anode.

Question 4

The Nernst equation is utilized to calculate:

Accepted Answer

Cell potential of an electrochemical cell under non-standard conditions

Answer

Gibbs free energy change of an electrochemical reaction

Answer

Equilibrium constant of an electrochemical reaction

Answer

Rate of an electrochemical reaction

Question 5

In a fuel cell, the primary processes occurring are:

Accepted Answer

Oxidation of fuel and reduction of oxygen

Answer

Reduction of fuel and oxidation of oxygen

Answer

Oxidation of fuel and oxidation of oxygen

Answer

Reduction of fuel and reduction of oxygen

Question 6

Which of the following is classified as a primary battery?

Accepted Answer

Dry cell battery

Answer

Lead-acid battery

Answer

Lithium-ion battery

Answer

Nickel-cadmium battery

Question 7

The Faraday constant represents:

Accepted Answer

The amount of charge carried by one mole of electrons

Answer

The amount of current flowing through a circuit in one second

Answer

The potential difference between two electrodes

Answer

The Gibbs free energy change of an electrochemical reaction

Question 8

Which product is formed during the electrolysis of water using inert platinum electrodes?

Accepted Answer

Hydrogen and oxygen

Answer

Hydrogen and chlorine

Answer

Oxygen and chlorine

Answer

Sodium hydroxide and hydrogen

Question 9

Which of the following is a disadvantage of lead-acid batteries?

Accepted Answer

Toxicity of lead

Answer

High energy density

Answer

Long lifespan

Answer

Low maintenance

Question 10

Which type of electrochemical cell utilizes differences in concentration?

Accepted Answer

Concentration cell

Answer

Galvanic cell

Answer

Electrolytic cell

Answer

Fuel cell

Question 11

In a redox reaction, the species that gains electrons and undergoes reduction is termed the:

Accepted Answer

Reducing agent

Answer

Oxidizing agent

Answer

Anode

Answer

Cathode

Question 12

Which of the listed factors **does not** influence the electromotive force (EMF) of an electrochemical cell?

Accepted Answer

Pressure

Answer

Concentration of reactants

Answer

Temperature

Answer

Nature of the electrodes

Question 13

The process of depositing a metal onto a cathode via an electric current passing through an electrolyte is referred to as:

Accepted Answer

Electroplating

Answer

Electrolysis

Answer

Electrophoresis

Answer

Electrorefining

Question 14

Which of the following serves as a quantitative measure of an electrode's ability to withstand corrosion?

Accepted Answer

Polarization resistance

Answer

Corrosion potential

Answer

Corrosion current

Answer

Tafel slope

Question 15

The process by which a metal dissolves into an electrolyte as a result of an electrochemical reaction is referred to as:

Accepted Answer

Anodic dissolution

Answer

Cathodic protection

Answer

Electrochemical polishing

Answer

Passivation

Question 16

Which of the following is **not** an application of electrochemistry?

Accepted Answer

Nuclear fission

Answer

Batteries

Answer

Fuel cells

Answer

Electroplating

Question 17

Which of the following is the reduction half-reaction taking place at the standard hydrogen electrode (SHE)?

Accepted Answer

2H+ + 2e- → H2

Answer

O2 + 4H+ + 4e- → 2H2O

Answer

2Cl- → Cl2 + 2e-

Answer

H2O → 1/2O2 + 2H+ + 2e-

Question 18

For a galvanic cell where zinc and copper electrodes are immersed in their respective ion solutions, at which electrode does oxidation occur?

Accepted Answer

Zinc

Answer

Both zinc and copper

Answer

Neither zinc nor copper

Answer

Copper

Question 19

During electrolysis, which process occurs at the negative electrode (cathode)?

Accepted Answer

Reduction

Answer

Oxidation

Answer

Hydrolysis

Answer

Ionization

Question 20

The Faraday constant (F) represents:

Accepted Answer

The magnitude of the charge carried by one mole of electrons

Answer

The concentration of ions in a solution

Answer

The number of ions in a gram-equivalent of an electrolyte

Answer

The potential of the hydrogen electrode

Question 21

A salt bridge in an electrochemical cell functions to:

Accepted Answer

Maintain electrical neutrality in the cell's half-cells

Answer

Prevent mixing of reactants and products

Answer

Control the temperature of the cell

Answer

Increase the flow of electrons

Question 22

Which of the following reactions is an example of a disproportionation reaction?

Accepted Answer

2Cu+ → Cu + Cu2+

Answer

Fe2+ + MnO4- → Fe3+ + Mn2+

Answer

Zn + 2H+ → Zn2+ + H2

Answer

Cu + 2Ag+ → 2Ag + Cu2+

Question 23

The Gibbs free energy change (ΔG) for an electrochemical cell is related to its EMF (E) by the equation:

Accepted Answer

ΔG = -nFE

Answer

ΔG = FE

Answer

ΔG = nE

Answer

ΔG = E/F