Redox Reactions Practice Questions
HSC/SSC (Bangladesh) · HSC Chemistry · 147 free MCQs with instant results and detailed explanations.
147
Total
40
Easy
75
Medium
32
Hard
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Sample Questions from Redox Reactions
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Q1
Easy
Which of the following statements correctly describes a redox reaction?
A.
It involves the transfer of protons between reactants.
B.
It involves the transfer of electrons between reactants.
C.
It occurs only in acidic solutions.
D.
It does not involve any change in oxidation states.
Show Answer & Explanation
Correct Answer: B
A redox reaction is characterized by the transfer of electrons between reactants, resulting in changes in their oxidation states.
Q2
Easy
In a redox reaction, which process involves the gain of electrons?
A.
Reduction
B.
Oxidation
C.
Decomposition
D.
Combination
Show Answer & Explanation
Correct Answer: A
Reduction is defined as the process in which an atom or ion gains electrons. This results in a decrease in oxidation state.
Q3
Easy
In a galvanic cell, which statement is true regarding the anode?
A.
The anode is the site of oxidation.
B.
The anode is the site of reduction.
C.
The anode has a positive charge.
D.
The anode produces electrons for the cathode.
Show Answer & Explanation
Correct Answer: A
In a galvanic cell, the anode is indeed the site of oxidation, where electrons are released, making it the negative terminal.
Q4
Medium
Which of the following species is reduced in the redox reaction: 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O?
A.
MnO4-
B.
C2O4^2-
C.
H+
D.
CO2
Show Answer & Explanation
Correct Answer: A
In this reaction, MnO4- is reduced to Mn^2+ as it gains electrons, while C2O4^2- is oxidized to CO2. Thus, MnO4- is the species that is reduced.
Q5
Medium
In a redox reaction, the half-reaction for oxidation of Zn can be represented as:
A.
Zn → Zn^2+ + 2e-
B.
Zn + 2e- → Zn^2+
C.
Zn^2+ + 2e- → Zn
D.
Zn^2+ → Zn + 2e-
Show Answer & Explanation
Correct Answer: A
The oxidation half-reaction involves the loss of electrons. Thus, the correct representation for the oxidation of Zn is Zn → Zn^2+ + 2e-, indicating that Zn is oxidized to Zn^2+.
Q6
Medium
What is the purpose of a salt bridge in a galvanic cell?
A.
To complete the electrical circuit
B.
To prevent oxidation
C.
To provide ions for the reaction
D.
To maintain charge neutrality
Show Answer & Explanation
Correct Answer: D
The salt bridge serves to maintain charge neutrality in the galvanic cell by allowing the flow of ions between the two half-cells, preventing charge buildup that could stop the reaction.
Q7
Medium
Which of the following is a characteristic of a redox reaction?
A.
Only one species is oxidized.
B.
Electrons are transferred between species.
C.
It involves only ionic compounds.
D.
Oxidation and reduction do not occur simultaneously.
Show Answer & Explanation
Correct Answer: B
A defining characteristic of redox reactions is the transfer of electrons between species, where one species undergoes oxidation (loses electrons) and another undergoes reduction (gains electrons).
Q8
Hard
In a redox reaction, if substance A is being reduced and substance B is being oxidized, which of the following is true about their oxidation states?
A.
The oxidation state of A decreases and the oxidation state of B increases.
B.
The oxidation state of A increases and the oxidation state of B decreases.
C.
Both A and B have their oxidation states increasing.
D.
Both A and B have their oxidation states decreasing.
Show Answer & Explanation
Correct Answer: A
In redox reactions, reduction involves a decrease in oxidation state, while oxidation involves an increase. Therefore, as A is reduced, its oxidation state decreases, and as B is oxidized, its oxidation state increases.
Q9
Hard
In a reaction between zinc and copper(II) sulfate, what is the standard cell potential (E°) if the half-cell potentials are given as E°(Zn²⁺/Zn) = -0.76 V and E°(Cu²⁺/Cu) = +0.34 V?
A.
0.10 V
B.
1.10 V
C.
0.34 V
D.
-1.10 V
Show Answer & Explanation
Correct Answer: B
The standard cell potential (E°) is calculated by subtracting the anode potential from the cathode potential. E° = E°(Cu²⁺/Cu) - E°(Zn²⁺/Zn) = 0.34 V - (-0.76 V) = 1.10 V.
Q10
Hard
In a redox reaction, which of the following statements is true about the oxidation state changes?
A.
The oxidation state of the reducing agent decreases.
B.
The oxidation state of the oxidizing agent increases.
C.
Both the oxidizing agent and reducing agent undergo oxidation.
D.
The oxidation state of products is always higher than that of the reactants.
Show Answer & Explanation
Correct Answer: B
In a redox reaction, the oxidizing agent gains electrons and its oxidation state increases. This is because it facilitates the oxidation of another substance, meaning its own electron count is reduced.
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Redox Reactions — HSC/SSC (Bangladesh) HSC Chemistry Practice Questions Online
This page contains 147 practice MCQs for the chapter Redox Reactions in HSC/SSC (Bangladesh) HSC Chemistry. The questions are organized by difficulty — 40 easy, 75 medium, 32 hard — so you can choose the right level for your preparation.
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