NCERT Exemplar Solutions Class 11 Chemistry Chapter 7 Redox Reactions PDF

NCERT Exemplar Solutions for Class 11 Chemistry Chapter 7 Redox Reactions solve all 38 questions from the Exemplar book. Every MCQ, Short Answer, Matching, Assertion and Reason and Long Answer problem is worked step by step in the free 129-page PDF, updated for the 2026-27 syllabus.

Every reaction here is a story about electrons changing owner. One species hands electrons over and is oxidised, another takes them and is reduced. The Exemplar pushes that idea into oxidation-number algebra, equation balancing and electrode potentials, which is far past the textbook exercise.

• CBSE Weightage: 4 to 6 marks, usually one balancing question and one oxidation-number calculation
• JEE Main Weightage: 1 to 2 questions per year, mostly oxidation numbers and electrode potential comparisons
• NEET Weightage: 1 question per year, generally on oxidising agents or disproportionation

Every solution is checked against the official NCERT Exemplar key, and the three printing errors in this chapter are worked out in full.

Why Chapter 7 Appears as Unit 8 in the Exemplar Book

Students often open the Exemplar and cannot find Redox Reactions at Chapter 7. The printed Exemplar still follows the older 14-unit edition, where this chapter sits as Unit 8. The textbook you study from numbers it Chapter 7. Same content, different unit number. Our solutions are built from that exact source unit, so the question numbers on this page match the book in your hand.

Topics Covered in the Class 11 Chemistry Redox Reactions Exemplar

The 38 questions rest on four skills. Each returns in Class 12 Electrochemistry, so the work here carries forward.

• Oxidation numbers: the fixed rules, and the small algebra that follows from them
• Oxidising and reducing agents: naming the agent by what it does to its partner
• Types of redox reactions: combination, decomposition, displacement and disproportionation
• Electrode potential: feasibility, the electrochemical series, and redox titration

Question Types in the Redox Reactions NCERT Exemplar

Six question types appear in this chapter. The Long Answer set is the heaviest, since each question there needs a full explanation rather than a single number.

Three Printing Errors in the Redox Reactions Exemplar

The printed book carries three slips in this chapter. None changes the marked answer, and all three are explained in the PDF.

• Question 3: the E° value for the Br₂/Br^- couple is printed as +1.90 V. The standard NCERT textbook table lists +1.09 V, so the digits look transposed. Bromine still sits well above copper, so option (D) stands either way.
• Question 5: the bromine equation is printed as S₂O₃^2- + 2Br₂ + 5H₂O → 2SO₄^2- + 2Br^- + 10H⁺. Four bromine atoms enter and two leave, and the charge reads -2 against +4. The balanced form needs 4Br₂ and 8Br^-.
• Question 23: the book's justification opens with the Lewis structure of S₂O₄^2-, but no part of the question contains that ion. Part (a) is Na₂S₂O₃, so it should read S₂O₃^2-.

Write the key's answer in the exam, but know why it is wrong. The marking scheme follows the printed key, so each solution gives the key's answer first and then explains the slip.

Common Mistakes Students Make in Redox Reactions

The Exemplar plants wrong options on purpose. These four catch most students, and each is flagged in the PDF where it appears.

• Naming the agent backwards: zinc is oxidised, so students call it an oxidant. The species that gets oxidised is the reducing agent. An oxidising agent takes electrons, so its own oxidation number falls.
• Equating the sum to zero: for HPO₃^2- the oxidation numbers sum to -2, not 0. Solving (+1) + x + 3(-2) = 0 gives +5, which is wrong but looks plausible.
• Missing the subscript 2: in Cl₂O₇ the equation is 2x - 14 = 0, giving +7. Reading it as x - 14 = 0 gives +14, which no chlorine atom can reach.
• Judging by charge, not potential: Fe³⁺ looks hungrier for electrons than Ag⁺, yet silver wins at +0.80 V. Only E° decides.

How the Exemplar Steps Up from the Class 11 Chemistry Textbook

The textbook hands you a rule and asks you to apply it. The Exemplar asks you to choose the rule, and often to explain why the obvious one fails.

Question 34 shows this well. Parts (b) and (d) look impossible to students who expect a feasible reaction to need a positive value somewhere. Both couples in part (d) are negative, at -0.40 and -0.44, yet the cell reads +0.04 V. Only the difference decides feasibility, and the double negative is where marks go. Question 23 does something similar with sulphur, where a fractional average of +2.5 in Na₂S₄O₆ warns you that the four atoms are not in identical environments.

How to Use These NCERT Exemplar Solutions for Boards, NEET and JEE

Attempt each question before you open the solution. The Exemplar rewards the attempt more than the reading.

• Boards: the Short Answer and Long Answer sets match the 3 and 5 mark board pattern closely
• NEET: work the MCQ I set first, since NEET repeats oxidation-number questions at that level
• JEE Main: the E° questions and the balancing problems in the Long Answer set are the closest NCERT practice available

Student Feedback

Students using Collegedunia's Class 11 Chemistry Exemplar Solutions told us the electrode potential questions were the hardest part of this chapter. Around 7 in 10 said that seeing the agent named by its effect on the partner, rather than by its own change, fixed an error they had repeated all year.

Other Resources for Class 11 Chemistry Redox Reactions

Collegedunia has the full set of study material for this chapter. Use the Notes for a first read, then the Exemplar once oxidation numbers feel steady.

Also Check:

• NCERT Solutions for Class 11 Chemistry Chapter 7
• Class 11 Chemistry Chapter 7 Notes
• Class 11 Chemistry Chapter 7 NCERT Book PDF
• Class 11 Chemistry Chapter 7 Exemplar Questions with Solutions

NCERT Exemplar Solutions for Other Class 11 Chemistry Chapters

Each chapter below has the same step-by-step treatment and a free PDF.