Electrochemistry Practice Questions
HSC/SSC (Bangladesh) · HSC Chemistry · 150 free MCQs with instant results and detailed explanations.
150
Total
49
Easy
76
Medium
25
Hard
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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 best describes an electrochemical cell?
A.
It converts chemical energy into electrical energy.
B.
It converts electrical energy into thermal energy.
C.
It solely produces heat without any electrical output.
D.
It can only operate with metals.
Show Answer & Explanation
Correct Answer: A
An electrochemical cell primarily functions by converting chemical energy from reactions into electrical energy, making option A the correct description.
Q2
Easy
What is the standard electrode potential of a half-cell if it is known to be involved in a reduction process where the electrode potential is +0.76 V?
A.
+0.76 V
B.
-0.76 V
C.
0 V
D.
+1.23 V
Show Answer & Explanation
Correct Answer: A
The standard electrode potential of a half-cell involved in a reduction process is directly given as +0.76 V, indicating its ability to gain electrons.
Q3
Easy
In an electrochemical cell, if the anode reaction involves oxidation of zinc to zinc ions, which substance is reduced?
A.
Zinc ions
B.
Copper ions
C.
Hydrogen gas
D.
Oxygen gas
Show Answer & Explanation
Correct Answer: B
In an electrochemical cell, the anode undergoes oxidation, and if zinc is oxidized, typically copper ions are reduced at the cathode, making option B correct.
Q4
Medium
Which of the following best describes the process of electrolysis?
A.
The decomposition of a compound by passing an electric current through it.
B.
The reaction between two metals in a galvanic cell.
C.
The transfer of electrons between two ions in a solution.
D.
The formation of a salt from an acid and a base.
Show Answer & Explanation
Correct Answer: A
Electrolysis is the process where an electric current is used to decompose a compound, typically in a liquid or solution state, into its constituents.
Q5
Medium
In a galvanic cell, if the oxidation half-reaction is Zn → Zn²⁺ + 2e⁻, what is the correct reduction half-reaction for copper?
A.
Cu²⁺ + 2e⁻ → Cu
B.
Cu + 2e⁻ → Cu²⁺
C.
Cu²⁺ → Cu + 2e⁻
D.
Cu²⁺ + e⁻ → Cu
Show Answer & Explanation
Correct Answer: A
In a galvanic cell, the reduction half-reaction involves gaining electrons; hence, Cu²⁺ + 2e⁻ → Cu accurately depicts the reduction of copper ions to copper metal.
Q6
Medium
What is the standard electrode potential of a cell if it comprises a zinc electrode with an E° of -0.76 V and a copper electrode with an E° of +0.34 V?
A.
0.10 V
B.
1.10 V
C.
-1.10 V
D.
0.34 V
Show Answer & Explanation
Correct Answer: B
The standard cell potential (E°cell) can be calculated by E°(cathode) - E°(anode). Here, it is +0.34 V (copper) - (-0.76 V (zinc)), giving 1.10 V.
Q7
Medium
Which factor does NOT affect the rate of an electrochemical reaction?
A.
Concentration of reactants
B.
Temperature of the environment
C.
Presence of a catalyst
D.
Color of the electrode
Show Answer & Explanation
Correct Answer: D
While concentration, temperature, and catalysts directly influence reaction rates, the color of the electrode does not affect the rate of an electrochemical reaction.
Q8
Hard
In an electrochemical cell, if the standard electrode potentials of Zn and Cu are -0.76 V and +0.34 V respectively, which of the following statements is true regarding the overall cell reaction?
A.
Zinc is oxidized and copper is reduced.
B.
Copper is oxidized and zinc is reduced.
C.
Both zinc and copper are oxidized.
D.
Both zinc and copper are reduced.
Show Answer & Explanation
Correct Answer: A
Zinc has a lower standard electrode potential than copper, indicating it is more likely to be oxidized. In the cell reaction, zinc loses electrons (is oxidized), while copper gains electrons (is reduced).
Q9
Hard
A voltaic cell consists of a copper half-cell and a zinc half-cell connected by a salt bridge. If the concentration of Cu²⁺ in the copper half-cell is increased, what will happen to the cell potential?
A.
The cell potential will increase.
B.
The cell potential will decrease.
C.
The cell potential will remain the same.
D.
The cell potential will fluctuate unpredictably.
Show Answer & Explanation
Correct Answer: A
Increasing the concentration of Cu²⁺ will shift the equilibrium towards the production of more Cu metal according to the Nernst equation, thus increasing the cell potential.
Q10
Hard
In an electrochemical cell, the standard electrode potential of zinc (Zn) is -0.76 V and that of copper (Cu) is +0.34 V. What is the standard cell potential (E°cell) for the cell reaction: Zn(s) + Cu^2+(aq) → Zn^2+(aq) + Cu(s)?
A.
+1.10 V
B.
+0.76 V
C.
-0.34 V
D.
-1.10 V
Show Answer & Explanation
Correct Answer: A
The standard cell potential is calculated using the formula E°cell = E°(cathode) - E°(anode). Here, Cu is the cathode and Zn is the anode. Thus, E°cell = (+0.34 V) - (-0.76 V) = +1.10 V, making option A the correct answer.
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Electrochemistry — HSC/SSC (Bangladesh) HSC Chemistry Practice Questions Online
This page contains 150 practice MCQs for the chapter Electrochemistry in HSC/SSC (Bangladesh) HSC Chemistry. The questions are organized by difficulty — 49 easy, 76 medium, 25 hard — so you can choose the right level for your preparation.
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