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Redox Reactions Practice Questions

NEET · Chemistry · 1361 free MCQs with instant results and detailed explanations.

1361
Total
313
Easy
556
Medium
492
Hard

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Topics in Redox Reactions

Balancing Redox 510
Oxidation Number 7
Electrochemical Series 844

Sample Questions from Redox Reactions

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
In a redox reaction, which substance is reduced?
A. The substance that gains electrons
B. The substance that loses electrons
C. The substance that oxidizes
D. The substance that remains unchanged
Show Answer & Explanation
Correct Answer: A
Reduction is defined as the gain of electrons. Therefore, the substance that gains electrons is the one that is reduced.
Q2
Easy
In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, what is being oxidized?
A. Zn
B. Cu²⁺
C. Zn²⁺
D. The reaction is not a redox reaction
Show Answer & Explanation
Correct Answer: A
Zinc (Zn) is losing electrons to form Zn²⁺, thus it is being oxidized.
Q3
Easy
Which of the following represents an oxidation half-reaction?
A. Fe → Fe²⁺ + 2e⁻
B. 2H⁺ + 2e⁻ → H₂
C. Ag⁺ + e⁻ → Ag
D. Cl₂ + 2e⁻ → 2Cl⁻
Show Answer & Explanation
Correct Answer: A
The oxidation half-reaction shows loss of electrons, which is represented by Fe forming Fe²⁺ and releasing electrons.
Q4
Medium
In the redox reaction between zinc and copper(II) sulfate, what is the oxidation half-reaction?
A. Zn → Zn²⁺ + 2e⁻
B. Cu²⁺ + 2e⁻ → Cu
C. Zn²⁺ + 2e⁻ → Zn
D. Cu + 2e⁻ → Cu²⁺
Show Answer & Explanation
Correct Answer: A
The oxidation half-reaction involves the loss of electrons. Zinc (Zn) loses 2 electrons to form Zn²⁺, thus it is oxidized.
Q5
Medium
In a balanced redox reaction in acidic medium, what is the total number of electrons transferred if Fe²⁺ is oxidized to Fe³⁺ and MnO₄⁻ is reduced to Mn²⁺?
A. 5
B. 6
C. 8
D. 2
Show Answer & Explanation
Correct Answer: B
Fe²⁺ to Fe³⁺ transfers 1 electron and MnO₄⁻ to Mn²⁺ requires 5 electrons, leading to a total of 6 electrons involved in the reaction.
Q6
Medium
Which of the following species acts as the reducing agent in the reaction: Cl₂ + 2Br⁻ → 2Cl⁻ + Br₂?
A. Cl₂
B. Br⁻
C. Cl⁻
D. Br₂
Show Answer & Explanation
Correct Answer: B
Br⁻ is oxidized to Br₂, which means it loses electrons and acts as the reducing agent, while Cl₂ is reduced.
Q7
Medium
When balancing the redox reaction in basic medium: Cr₂O₇²⁻ + H₂O → Cr(OH)₃ + OH⁻, how many hydroxide ions (OH⁻) are needed for balancing?
A. 4
B. 6
C. 2
D. 8
Show Answer & Explanation
Correct Answer: B
To balance the given reaction, 6 OH⁻ ions are required to balance the chromium and oxygen atoms on both sides.
Q8
Hard
In the reaction between Zn and HCl, which species acts as the reducing agent?
A. Zn
B. HCl
C. ZnCl2
D. H2
Show Answer & Explanation
Correct Answer: A
Zinc (Zn) donates electrons and is oxidized, making it the reducing agent.
Q9
Hard
When balancing the redox reaction MnO4- + Fe^2+ → Mn^2+ + Fe^3+, what is the change in oxidation state of manganese?
A. 0
B. −3
C. −7
D. +7
Show Answer & Explanation
Correct Answer: D
Manganese changes from +7 in MnO4- to +2 in Mn^2+, indicating a reduction of 5.
Q10
Hard
Which of the following half-reactions illustrates reduction?
A. Cu^2+ + 2e- → Cu
B. 2H2 → 4H+ + 4e-
C. Fe → Fe^3+ + 3e-
D. 2Cl- → Cl2 + 2e-
Show Answer & Explanation
Correct Answer: A
The half-reaction Cu^2+ + 2e- → Cu shows the gain of electrons, characteristic of reduction.

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Redox Reactions — NEET Chemistry Practice Questions Online

This page contains 1361 practice MCQs for the chapter Redox Reactions in NEET Chemistry. The questions are organized by difficulty — 313 easy, 556 medium, 492 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. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.