Electrochemistry Practice Questions
NECO (Nigeria) · NECO Chemistry · 152 free MCQs with instant results and detailed explanations.
152
Total
49
Easy
77
Medium
26
Hard
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Sample Questions from Electrochemistry
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Q1
Easy
What is the primary function of an electrolytic cell?
A.
To convert chemical energy into electrical energy
B.
To convert electrical energy into chemical energy
C.
To measure electrical conductivity
D.
To separate ions in a liquid
Show Answer & Explanation
Correct Answer: B
An electrolytic cell uses electrical energy to drive a non-spontaneous chemical reaction, effectively converting electrical energy into chemical energy.
Q2
Easy
In a galvanic cell, which of the following occurs at the anode?
A.
Reduction of ions
B.
Oxidation of species
C.
Deposition of metal
D.
Flow of electrons to the cathode
Show Answer & Explanation
Correct Answer: B
In a galvanic cell, oxidation occurs at the anode, where electrons are released, contributing to the flow of electrical current.
Q3
Easy
Which of the following statements is true concerning electrolysis?
A.
It cannot occur in molten electrolytes.
B.
Gases can be produced during electrolysis.
C.
Only solids can be electrolyzed.
D.
It occurs without an external power source.
Show Answer & Explanation
Correct Answer: B
During electrolysis, chemical reactions can produce gases at the electrodes, such as hydrogen and oxygen from water electrolysis.
Q4
Medium
In a galvanic cell, which of the following processes occurs at the anode?
A.
Reduction of ions
B.
Oxidation of ions
C.
Neutralization of acids
D.
Hydrolysis of water
Show Answer & Explanation
Correct Answer: B
At the anode of a galvanic cell, oxidation occurs, where electrons are released from the species being oxidized, hence option B is correct.
Q5
Medium
What is the standard electrode potential of a half-cell where copper ions are reduced to copper metal?
A.
0.00 V
B.
+0.34 V
C.
-0.76 V
D.
+1.07 V
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Correct Answer: B
The standard electrode potential for the copper half-reaction (Cu²⁺ + 2e⁻ → Cu) is +0.34 V, indicating a tendency to gain electrons.
Q6
Medium
A salt bridge in an electrochemical cell primarily serves to:
A.
Provide a conductive path for electrons
B.
Balance the charge between the two half-cells
C.
Prevent the mixing of solutions
D.
Increase the cell's temperature
Show Answer & Explanation
Correct Answer: B
The salt bridge allows ions to move between the half-cells, balancing the charge and completing the circuit, which makes option B the correct answer.
Q7
Medium
Calculate the cell potential for a galvanic cell comprised of a zinc and copper half-cell, given the standard reduction potentials are +0.34 V for Cu²⁺/Cu and -0.76 V for Zn²⁺/Zn.
A.
1.10 V
B.
0.10 V
C.
0.76 V
D.
-1.10 V
Show Answer & Explanation
Correct Answer: A
To find the cell potential, use the formula E_cell = E_cathode - E_anode. Here, E_cell = 0.34 V - (-0.76 V) = 1.10 V, making option A correct.
Q8
Hard
In an electrochemical cell, if the standard electrode potential (E°) of the cathode is +0.76 V and that of the anode is -0.44 V, what is the overall cell potential (E°cell)?
A.
+1.20 V
B.
+0.32 V
C.
+0.44 V
D.
-0.76 V
Show Answer & Explanation
Correct Answer: A
The cell potential (E°cell) is calculated as E°(cathode) - E°(anode). Hence, E°cell = 0.76 V - (-0.44 V) = 0.76 V + 0.44 V = 1.20 V.
Q9
Hard
Which of the following statements best explains why a salt bridge is essential in an electrochemical cell?
A.
It allows the electrochemical reaction to occur faster.
B.
It prevents the mixing of the two electrolytes.
C.
It maintains electrical neutrality by allowing ion flow.
D.
It increases the temperature of the cell for better efficiency.
Show Answer & Explanation
Correct Answer: C
A salt bridge is essential because it maintains electrical neutrality in the electrochemical cell by allowing ions to flow between the two half-cells, balancing charge as reactions occur.
Q10
Hard
Which of the following statements accurately describes the function of a salt bridge in an electrochemical cell?
A.
It allows for the movement of electrons between the electrodes.
B.
It maintains electrical neutrality by allowing the flow of ions.
C.
It alters the concentration of the electrolyte solutions.
D.
It increases the voltage output of the cell.
Show Answer & Explanation
Correct Answer: B
The salt bridge maintains electrical neutrality by allowing the flow of ions between the two half-cells, balancing the charge that builds up as the electrochemical reaction proceeds.
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Electrochemistry — NECO (Nigeria) NECO Chemistry Practice Questions Online
This page contains 152 practice MCQs for the chapter Electrochemistry in NECO (Nigeria) NECO Chemistry. The questions are organized by difficulty — 49 easy, 77 medium, 26 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.