Electrochemistry Quizzes: Test Your Understanding

Question 1

Which of the following represents the standard reduction potential for the reaction: Fe3+ + e- → Fe2+?

Accepted Answer

+0.77 V

Answer

-0.77 V

Answer

+2.20 V

Answer

-2.20 V

Question 2

In a galvanic cell involving a zinc electrode and a copper electrode, which direction do electrons flow?

Accepted Answer

From zinc to copper

Answer

From copper to zinc

Question 3

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

Accepted Answer

2Cu+ → Cu + Cu2+

Answer

2H2O → O2 + 4H+ + 4e-

Answer

Cu + 2Ag+ → Cu2+ + 2Ag

Answer

2Fe3+ → Fe2+ + Fe4+

Question 4

What is a common fuel used in fuel cells?

Accepted Answer

Hydrogen

Answer

Methane

Answer

Propane

Answer

Butane

Question 5

Which of the following is the strongest oxidizing agent?

Accepted Answer

F2

Answer

Cl2

Answer

Br2

Answer

I2

Question 6

The electromotive force (EMF) of a cell measures:

Accepted Answer

Potential difference between the electrodes

Answer

Maximum work done by the cell

Answer

Reaction rate

Answer

Reactant concentration

Question 7

In an electrochemical cell, where does oxidation occur?

Accepted Answer

Anode

Answer

Cathode

Answer

Electrolyte

Answer

Salt bridge

Question 8

In electrochemistry, a positive cell potential indicates:

Accepted Answer

A spontaneous reaction

Answer

A non-spontaneous reaction

Answer

A reaction at equilibrium

Question 9

In a galvanic cell, which electrode is the anode?

Accepted Answer

The electrode where oxidation occurs and electrons are released

Answer

The electrode where reduction occurs and electrons are consumed

Answer

The electrode connected to the positive terminal

Answer

The electrode connected to the negative terminal

Question 10

Which of the following reactions is a reduction half-reaction?

Accepted Answer

Cu2+ + 2e- → Cu

Answer

Fe3+ + e- → Fe2+

Answer

Fe2+ → Fe3+ + e-

Answer

Cu → Cu2+ + 2e-

Question 11

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

Accepted Answer

Primary batteries cannot be recharged, while secondary batteries can be recharged multiple times

Answer

Secondary batteries have a higher energy density than primary batteries

Answer

Primary batteries use aqueous electrolytes, while secondary batteries use non-aqueous electrolytes

Answer

Primary batteries are more expensive than secondary batteries

Question 12

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

Accepted Answer

0 V

Answer

1 V

Answer

-1 V

Answer

0.76 V

Question 13

Consider the half-reaction: Fe3+ + e- → Fe2+.
What is the oxidation state of iron in the product?

Accepted Answer

+2

Answer

+3

Answer

-3

Answer

-2

Question 14

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

Accepted Answer

Positive cell potential

Answer

Negative cell potential

Answer

Zero cell potential

Answer

Requires an external power source

Question 15

What is the primary function of a 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 formation of gases at the electrodes

Answer

To act as a catalyst for the reaction

Question 16

What are the primary products of the electrolysis of water?

Accepted Answer

Hydrogen and oxygen

Answer

Chlorine and sodium hydroxide

Answer

Nitric acid and ammonia

Answer

Carbon dioxide and water

Question 17

Which of the following is NOT an application of electrochemistry?

Accepted Answer

Nuclear reactors

Answer

Electroplating

Answer

Batteries

Answer

Fuel cells

Question 18

What does the Nernst equation represent?

Accepted Answer

The relationship between cell potential and the concentrations of reactants and products

Answer

The relationship between the rate of an electrochemical reaction and the cell potential

Answer

The relationship between the equilibrium constant and the cell potential

Answer

The relationship between the Gibbs free energy and the cell potential

Question 19

What is the significance of the Faraday constant in electrochemistry?

Accepted Answer

It represents the charge carried by one mole of electrons

Answer

It represents the number of electrons transferred in a redox reaction

Answer

It represents the rate at which electrons are transferred in an electrochemical reaction

Answer

It represents the equilibrium constant for an electrochemical reaction

Question 20

In an electrochemical cell, the salt bridge facilitates the movement of:

Accepted Answer

Ions

Answer

Electrons

Answer

Protons

Answer

Neutrons

Question 21

During electrolysis, how does Faraday's constant help us calculate the amount of substance changed?

Accepted Answer

It shows a direct link between the electrical charge used and the amount of substance created or consumed.

Answer

It determines how fast electrolysis happens.

Answer

It influences what kind of substance is made during electrolysis.

Answer

It only works with solutions containing water.

Question 22

In an electrochemical cell, the anode is the site of:

Accepted Answer

Oxidation

Answer

Electron gain

Answer

Cathode reaction

Answer

Reduction

Question 23

The process of utilizing electrical energy to drive a chemical reaction is termed:

Accepted Answer

Electrolysis

Answer

Electrochemistry

Answer

Electromotive force

Answer

Redox reaction

Question 24

The electromotive force (EMF) of an electrochemical cell is a measure of its:

Accepted Answer

Maximum potential difference

Answer

Power

Answer

Resistance

Answer

Current

Question 25

Which instrument is employed to measure the EMF of an electrochemical cell?

Accepted Answer

Voltmeter

Answer

Ohmmeter

Answer

Wattmeter

Answer

Ammeter

Question 26

The Nernst equation relates the EMF of an electrochemical cell to the:

Accepted Answer

Concentrations of reactants and products

Answer

Volume

Answer

Pressure

Answer

Temperature

Question 27

Electroplating, in the context of electrochemistry, refers to the process of:

Accepted Answer

Coating a metal with another metal via electrolysis

Answer

Electrolysis itself

Answer

Electroless plating

Answer

Galvanization