NCERT  ·  Chemistry  ·  Class XI  ·  Ch.7

Redox Reactions
MCQ Master Series

Oxidation Number · Balancing Equations · Electron Transfer · Electrochemical Cells

🎯 50 Questions
⏱ 30 min Suggested
📊 3 Difficulty Tiers
🗂 6 Topics
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Question Intelligence

Quiz Analytics

A data-driven breakdown of all 50 questions by difficulty, exam origin and topic distribution.

📈 Distribution Overview

50
Total Questions
CBSE Board
27
JEE Level
14
NEET Level
9

🗂 Topic Coverage

Classical & Electronic Concept
18%
Oxidation Number Rules
22%
Types of Redox Reactions
18%
Balancing (Oxidation No. Method)
16%
Balancing (Ion-Electron Method)
14%
Electrochemical Cells
12%
27
CBSE Board
14
JEE Level
9
NEET Level
Conceptual Framework

Key Concept Highlights

6 foundational pillars that power every question in this quiz. Understand these, and the answers follow naturally.

🔥
Classical Concept
Oxidation = addition of oxygen/removal of hydrogen. Reduction = removal of oxygen/addition of hydrogen. The older, substance-based definition.
⚡
Electronic Concept
Oxidation = loss of electrons (increase in oxidation number). Reduction = gain of electrons (decrease in oxidation number). Oxidation and reduction always occur together.
🔢
Oxidation Number Rules
Free elements = 0; simple ions = charge on ion; oxygen usually −2 (−1 in peroxides); hydrogen usually +1 (−1 in metal hydrides); sum in a neutral compound = 0, in an ion = ionic charge.
🔀
Types of Redox Reactions
Combination, decomposition, displacement, and disproportionation (same species is both oxidised and reduced, e.g. Cl₂ in NaOH).
⚖️
Balancing Methods
Oxidation number method: equalise total increase and decrease in oxidation number. Ion-electron (half-reaction) method: split into oxidation and reduction half-reactions, balance atoms/charge, then add.
🔋
Electrochemical Cells
Galvanic (voltaic) cells convert chemical energy from a spontaneous redox reaction into electrical energy. Standard electrode potential ranks the tendency of a species to be reduced.
Pedagogical Value

Why MCQs Matter

Multiple-choice questions are not mere guessing games — they are the sharpest diagnostic tool available to a competitive exam aspirant.

~8%

of CBSE Class XI Chemistry — direct base for Electrochemistry in Class XII

Quick Reference

Important Formula Capsules

6 must-memorise equations that surface repeatedly across CBSE and JEE papers.

Oxidation Number Sum (neutral)
\[ \sum (\text{Oxidation Numbers}) = 0 \]
Oxidation Number Sum (ion)
\[ \sum (\text{Oxidation Numbers}) = \text{Charge on ion} \]
Half-Reaction (Oxidation)
\[ M \rightarrow M^{n+} + ne^- \]
Half-Reaction (Reduction)
\[ X + ne^- \rightarrow X^{n-} \]
Disproportionation Example
\[ Cl_2 + 2NaOH \rightarrow NaCl + NaOCl + H_2O \]
Cell Notation
\[ Zn(s) \mid Zn^{2+}(aq) \parallel Cu^{2+}(aq) \mid Cu(s) \]
Learning Outcomes

What You Will Learn

By completing this quiz set you will have exercised all the following competencies.

01 Assign oxidation numbers to every atom in a given compound or ion
02 Identify the oxidising agent and reducing agent in a redox reaction
03 Classify a redox reaction as combination, decomposition, displacement, or disproportionation
04 Balance redox equations using the oxidation number method
05 Balance redox equations in acidic and basic medium using the ion-electron method
06 Write the cell notation and identify anode/cathode for a simple galvanic cell
Exam Preparation

Strategy & Preparation Tips

4 evidence-based strategies to maximise your score in CBSE Boards and JEE.

Step 01
Oxidation Number Rule Sheet
Write out all seven oxidation-number rules on one card, with the two most-tested exceptions: O in peroxides (−1) and H in metal hydrides (−1).
Step 02
Spot the Disproportionation
A reaction is disproportionation when the SAME element ends up with both a higher and lower oxidation number in the products. Classic exam trap: Cl₂, P₄, and H₂O₂ reactions.
Step 03
Ion-Electron Method, Step Order
Fixed order: (1) split half-reactions, (2) balance atoms other than O/H, (3) balance O using H₂O, (4) balance H using H⁺ (acidic) or OH⁻ (basic), (5) balance charge using electrons, (6) equalise and add electrons.
Step 04
Agent Identification Shortcut
The species that is REDUCED is the oxidising agent; the species that is OXIDISED is the reducing agent. Reversing this is the single most common MCQ error.

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🎯 Knowledge Check

Chemistry — Redox Reactions

50 Questions Class 11 MCQs
1
Oxidation is best defined as:
2
Reduction is defined as:
3
Which of the following species acts as an oxidising agent?
4
Which of the following is a reducing agent?
5
In the reaction \(2Mg + O_2 \rightarrow 2MgO\), magnesium undergoes:
6
The oxidation number of oxygen in most compounds is:
7
The oxidation number of hydrogen in \(NaH\) is:
8
The oxidation number of fluorine in its compounds is always:
9
The oxidation number of elemental sulphur in \(S_8\) is:
10
The oxidation number of sodium in \(NaCl\) is:
11
The oxidation number of chlorine in \(HCl\) is:
12
The oxidation number of oxygen in hydrogen peroxide (\(H_2O_2\)) is:
13
Which of the following contains oxygen with oxidation number \(+\!2\)?
14
The oxidation number of carbon in \(CO_2\) is:
15
The oxidation number of sulphur in \(H_2SO_4\) is:
16
Which one of the following is NOT a redox reaction?
17
Which statement is correct regarding oxidation number?
18
In the reaction \(CuO+H_2\rightarrow Cu+H_2O\), hydrogen acts as:
19
Which of the following correctly represents oxidation?
20
Which statement about redox reactions is correct?
21
The oxidation number of nitrogen in \(NH_3\) is:
22
The oxidation number of nitrogen in \(HNO_3\) is:
23
The oxidation number of chromium in \(K_2Cr_2O_7\) is:
24
The oxidation number of manganese in \(KMnO_4\) is:
25
The oxidation number of sulphur in \(SO_2\) is:
26
The oxidation number of phosphorus in \(H_3PO_4\) is:
27
The oxidation number of chlorine in \(KClO_3\) is:
28
The oxidation number of carbon in \(CO\) is:
29
Which compound contains oxygen with oxidation number \(-\dfrac{1}{2}\)?
30
The oxidation number of iron in \(Fe_2O_3\) is:
31
According to Stock notation, \(FeCl_2\) is named:
32
Which compound is correctly named as Copper(I) oxide?
33
The Stock notation for \(AuCl_3\) is:
34
Which one of the following metals commonly exhibits variable oxidation states?
35
The oxidation number of sulphur in sulphate ion \(\left(SO_4^{2-}\right)\) is:
36
The oxidation number of carbon in carbonate ion \(\left(CO_3^{2-}\right)\) is:
37
Which statement about oxidation number is INCORRECT?
38
Which one of the following reactions involves oxidation of iron?
39
Which statement correctly describes an oxidising agent?
40
Which of the following species is the strongest reducing agent?
41
Which of the following is a combination redox reaction?
42
Which of the following is a decomposition redox reaction?
43
Which of the following is NOT a redox reaction?
44
In the reaction \(Zn + CuSO_4 \rightarrow ZnSO_4 + Cu\), zinc acts as:
45
Which of the following is a metal displacement reaction?
46
Which of the following represents a non-metal displacement reaction?
47
Which metal liberates hydrogen gas rapidly from cold water?
48
The reaction \(2H_2O_2 \rightarrow 2H_2O + O_2\) is an example of:
49
In a disproportionation reaction, an element:
50
Which one of the following reactions is a disproportionation reaction?
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Redox Reactions MCQs Class 11 Chemistry | 50 Questions
Redox Reactions MCQs Class 11 Chemistry | 50 Questions — Complete Notes & Solutions · academia-aeternum.com
Sharpen your understanding of NCERT Class 11 Chemistry Chapter 7 – Redox Reactions with this carefully curated collection of 50 multiple-choice questions designed to build concepts step by step. Beginning with the fundamentals of oxidation, reduction, oxidation number and electron transfer, the questions gradually progress to Stock notation, types of redox reactions, balancing of redox equations, redox titrations, electrode processes and real-world applications. Each question is accompanied by…
🎓 Class 11 📐 Chemistry 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
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Frequently Asked Questions

Practicing MCQs helps strengthen conceptual understanding of oxidation, reduction, oxidation number, redox reactions and balancing methods while improving speed and accuracy for CBSE Board, JEE Main, NEET and CUET examinations.

Yes. All questions are prepared strictly according to the latest NCERT Class 11 Chemistry Chapter 7 syllabus and follow the competency-based approach recommended for CBSE examinations.

Yes. Every MCQ is accompanied by the correct answer and a concise explanation to help you understand the concept rather than simply memorising the answer.

The questions cover oxidation and reduction, oxidation number, oxidising and reducing agents, Stock notation, types of redox reactions, balancing redox equations, redox titrations, electrode processes and the Daniell cell.

Yes. The questions progress from basic to advanced difficulty, making them useful for CBSE Board examinations as well as JEE Main, NEET and CUET preparation.

It is advisable to solve all 50 MCQs at least twice and carefully review the explanations for incorrect answers to strengthen conceptual understanding.

Yes. Along with factual questions, the set includes conceptual and application-based questions designed according to the latest CBSE examination pattern.

Yes. Regular practice of MCQs improves question-solving speed, accuracy, time management and confidence during objective examinations.

You should revise oxidation and reduction, oxidation number rules, balancing redox reactions, types of redox reactions, redox titrations and electrode processes to perform well in the quiz.

Focus on understanding concepts instead of memorising facts, practise oxidation number calculations, learn balancing methods thoroughly and regularly solve NCERT-based MCQs with explanations.

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    ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
    Sharing this chapter
    Redox Reactions MCQs Class 11 Chemistry | 50 Questions
    Redox Reactions MCQs Class 11 Chemistry | 50 Questions — Complete Notes & Solutions · academia-aeternum.com
    Sharpen your understanding of NCERT Class 11 Chemistry Chapter 7 – Redox Reactions with this carefully curated collection of 50 multiple-choice questions designed to build concepts step by step. Beginning with the fundamentals of oxidation, reduction, oxidation number and electron transfer, the questions gradually progress to Stock notation, types of redox reactions, balancing of redox equations, redox titrations, electrode processes and real-world applications. Each question is accompanied by…
    🎓 Class 11 📐 Chemistry 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
    Share on
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    Telegram
    X / Twitter
    Facebook
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    Threads
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    Reddit
    Email
    academia-aeternum.com/class-11/chemistry/redox-reactions/mcqs/ Copy link
    💡
    Exam tip: Sharing chapter notes with your study group creates a reinforcement loop. Teaching a concept is the fastest path to mastering it.

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