Electrochemistry Practice Questions
SPM (Malaysia) · SPM Chemistry · 151 free MCQs with instant results and detailed explanations.
151
Total
48
Easy
76
Medium
27
Hard
Start Practicing Electrochemistry
Take a timed quiz or customize your practice session
Sample Questions from Electrochemistry
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following statements correctly describes an electrolytic cell?
A.
It requires an external voltage to drive a non-spontaneous reaction.
B.
It generates electrical energy from spontaneous reactions.
C.
It operates spontaneously under standard conditions.
D.
It does not require any ion movement.
Show Answer & Explanation
Correct Answer: A
An electrolytic cell uses an external voltage to drive a non-spontaneous reaction, making option A correct. The other options describe characteristics of galvanic cells or misunderstand the requirements of an electrolytic process.
Q2
Easy
In an electrochemical cell, what happens at the anode during oxidation?
A.
Electrons are gained by the substance.
B.
Electrons are lost from the substance.
C.
Ions are produced without any change in mass.
D.
It remains unchanged.
Show Answer & Explanation
Correct Answer: B
At the anode, oxidation occurs, which involves the loss of electrons from the substance. Therefore, option B is correct. Options A and C describe reduction or incorrect processes, while D incorrectly states that the anode is unchanged.
Q3
Easy
Which of the following factors does NOT affect the rate of electrolysis in an electrolytic cell?
A.
Concentration of the electrolyte.
B.
Temperature of the electrolyte.
C.
Type of electrodes used.
D.
Shape of the container holding the electrolyte.
Show Answer & Explanation
Correct Answer: D
The shape of the container does not directly influence the rate of electrolysis. However, factors like concentration, temperature, and electrode type significantly affect the rate, making option D the correct answer.
Q4
Medium
Which of the following statements about electrolysis is true?
A.
Electrolysis can only occur in solid-state substances.
B.
Electrolysis involves the decomposition of a compound into its elements.
C.
Electrolysis requires a catalyst for the reaction to take place.
D.
Electrolysis always produces hydrogen gas at the anode.
Show Answer & Explanation
Correct Answer: B
Electrolysis involves the breakdown of a compound into its constituent elements when an electric current is passed through it. This makes option B correct.
Q5
Medium
In a galvanic cell, which of the following correctly describes the flow of electrons?
A.
Electrons flow from the cathode to the anode.
B.
Electrons flow from the anode to the cathode.
C.
Electrons flow in a closed circuit outside the cell only.
D.
Electrons do not flow in a galvanic cell.
Show Answer & Explanation
Correct Answer: B
In a galvanic cell, electrons flow from the anode (where oxidation occurs) to the cathode (where reduction occurs), making option B the correct choice.
Q6
Medium
What is the main purpose of a salt bridge in an electrochemical cell?
A.
To provide a source of power.
B.
To maintain electrical neutrality.
C.
To increase the rate of reaction.
D.
To isolate the anode and cathode.
Show Answer & Explanation
Correct Answer: B
The primary function of a salt bridge is to maintain electrical neutrality in the electrochemical cell by allowing the flow of ions, thus making option B correct.
Q7
Medium
If the standard electrode potential for the reduction of copper ions (Cu2+) to copper (Cu) is +0.34 V, what can be inferred about the feasibility of this reaction?
A.
The reaction is not feasible under standard conditions.
B.
The reaction is highly feasible under all conditions.
C.
The reaction is feasible under standard conditions.
D.
The reaction will only occur in acidic solutions.
Show Answer & Explanation
Correct Answer: C
A positive standard electrode potential (+0.34 V) indicates that the reduction of Cu2+ to Cu is feasible under standard conditions, making option C correct.
Q8
Hard
In a galvanic cell, if the concentration of the electrolyte is increased, what will happen to the cell potential?
A.
It will increase due to higher ion availability.
B.
It will decrease due to increased resistance.
C.
It will remain unchanged.
D.
It will increase only if the temperature rises.
Show Answer & Explanation
Correct Answer: A
Increasing the concentration of the electrolyte increases the number of ions available for redox reactions, thus enhancing the cell potential according to the Nernst equation.
Q9
Hard
A zinc electrode is immersed in a 0.1 M ZnSO4 solution, while a copper electrode is in a 0.01 M CuSO4 solution. Calculate the cell potential (E) at 25°C using the standard reduction potentials (E°) for Zn²⁺/Zn and Cu²⁺/Cu.
A.
0.40 V
B.
0.80 V
C.
1.10 V
D.
0.20 V
Show Answer & Explanation
Correct Answer: B
Using the Nernst equation, E = E° - (RT/nF) * ln(Q). For this cell, the standard potential (E°) is +1.10 V, and after calculating Q, the resulting potential is +0.80 V.
Q10
Hard
In a galvanic cell, if the concentration of the electrolyte in the anode half-cell is increased, what effect does this have on the cell potential?
A.
The cell potential increases.
B.
The cell potential decreases.
C.
The cell potential remains unchanged.
D.
The cell potential fluctuates.
Show Answer & Explanation
Correct Answer: A
Increasing the concentration of the electrolyte at the anode increases the likelihood of oxidation reactions, which raises the cell potential according to the Nernst equation.
Showing 10 of 151 questions. Start a quiz to practice all questions with scoring and timer.
Practice All 151 Questions →Other SPM (Malaysia) Subjects
Electrochemistry — SPM (Malaysia) SPM Chemistry Practice Questions Online
This page contains 151 practice MCQs for the chapter Electrochemistry in SPM (Malaysia) SPM Chemistry. The questions are organized by difficulty — 48 easy, 76 medium, 27 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.