Electrochemistry Practice Questions
IGCSE (Cambridge) · IGCSE Chemistry · 151 free MCQs with instant results and detailed explanations.
151
Total
48
Easy
78
Medium
25
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 separate different substances
D.
To produce heat energy
Show Answer & Explanation
Correct Answer: B
An electrolytic cell uses electrical energy to drive a non-spontaneous chemical reaction, thus converting electrical energy into chemical energy.
Q2
Easy
Which of the following ions is typically reduced at the cathode during electrolysis?
A.
Na+
B.
Cl-
C.
Cu2+
D.
SO4^2-
Show Answer & Explanation
Correct Answer: C
During electrolysis, cations such as Cu2+ are reduced at the cathode, accepting electrons to form solid copper.
Q3
Easy
What is the main purpose of using a salt bridge in a galvanic cell?
A.
To prevent the mixing of the two solutions
B.
To provide a path for electrons
C.
To allow ionic movement and maintain charge balance
D.
To increase the voltage of the cell
Show Answer & Explanation
Correct Answer: C
A salt bridge allows ions to move between the two half-cells, maintaining charge balance and allowing the cell to function properly.
Q4
Medium
Which of the following statements correctly describes an electrolytic cell?
A.
It converts electrical energy to chemical energy.
B.
It produces electrical energy from chemical reactions.
C.
It operates spontaneously without external energy.
D.
It requires a direct current to drive a non-spontaneous reaction.
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Correct Answer: D
An electrolytic cell requires an external direct current to drive non-spontaneous chemical reactions, making it essential for processes like electrolysis.
Q5
Medium
In the electrolysis of aqueous sodium chloride, which gas is produced at the anode?
A.
Hydrogen
B.
Chlorine
C.
Oxygen
D.
Sodium
Show Answer & Explanation
Correct Answer: B
During the electrolysis of aqueous sodium chloride, chlorine gas is produced at the anode as chloride ions lose electrons and oxidize.
Q6
Medium
What is the primary reason copper is used as a conductor in electrochemical cells?
A.
It has a high melting point.
B.
It easily forms ions.
C.
It has excellent electrical conductivity.
D.
It reacts readily with acids.
Show Answer & Explanation
Correct Answer: C
Copper is chosen for its excellent electrical conductivity, which allows efficient transport of electrons in electrochemical cells.
Q7
Medium
Which factor does NOT affect the rate of electrolysis?
A.
Current strength
B.
Electrode surface area
C.
Temperature
D.
Concentration of reactants
Show Answer & Explanation
Correct Answer: D
While concentration affects the overall reaction, the rate of electrolysis is primarily influenced by current strength, electrode surface area, and temperature, but not directly by concentration alone.
Q8
Hard
Which of the following statements correctly describes the process occurring at the anode during the electrolysis of sodium chloride solution?
A.
Sodium ions are reduced to sodium metal.
B.
Chloride ions are oxidized to chlorine gas.
C.
Water is decomposed to produce hydrogen gas.
D.
Hydroxide ions are formed from water molecules.
Show Answer & Explanation
Correct Answer: B
At the anode, chloride ions (Cl-) are oxidized to form chlorine gas (Cl2). This is a key reaction in the electrolysis of sodium chloride solution, confirming that option B is correct.
Q9
Hard
If a cell is constructed using a copper electrode in a 1.0 M CuSO4 solution and a zinc electrode in a 1.0 M ZnSO4 solution, which statement about the cell potential is true?
A.
The cell potential will be zero.
B.
The cell potential will be positive.
C.
The cell potential can be calculated using the Nernst equation.
D.
The cell potential is always negative for metal ions.
Show Answer & Explanation
Correct Answer: C
The cell potential can be calculated using the Nernst equation, which accounts for concentration differences of the ions. This is crucial for predicting the potential of the electrochemical cell.
Q10
Hard
In an electrochemical cell, if the standard electrode potential of the cathode is +0.80 V and that of the anode is -0.76 V, what is the overall cell potential?
A.
+1.56 V
B.
+0.04 V
C.
-1.56 V
D.
+1.36 V
Show Answer & Explanation
Correct Answer: D
The overall cell potential (E_cell) is calculated using E_cell = E_cathode - E_anode. So, E_cell = (+0.80 V) - (-0.76 V) = 1.36 V. Therefore, the correct answer is +1.36 V.
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Electrochemistry — IGCSE (Cambridge) IGCSE Chemistry Practice Questions Online
This page contains 151 practice MCQs for the chapter Electrochemistry in IGCSE (Cambridge) IGCSE Chemistry. The questions are organized by difficulty — 48 easy, 78 medium, 25 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.