Class 12 Chemistry Chapter 2 Electrochemistry carries 68 problems in the NCERT Exemplar, spread across five question types, more than what the textbook exercise itself offers. The Exemplar pushes Nernst equation, conductivity, electrolysis, and battery cells well past CBSE level. This page hosts the 2026-27 Exemplar PDF, the question-type map, and the JEE / NEET mapping.
- CBSE Weightage: 4–6 marks (typical split: one short answer plus one numerical)
- JEE Main Weightage: 4–5% (2–3 questions per paper)
- NEET Weightage: 2–3 questions per year
You can download the complete Electrochemistry Exemplar Book PDF along with the question-type tour, Exemplar vs NCERT difficulty notes, and the JEE / NEET mapping in the sections below.
This Exemplar Book PDF is curated by subject experts, mapped to the 2026-27 NCERT, and cross-checked against the last five years of CBSE Board, JEE Main, and NEET papers.
Also Check:
- Electrochemistry Class 12 Chemistry NCERT Exemplar Solutions
- Electrochemistry Class 12 Chemistry NCERT Book PDF
Electrochemistry Exemplar: MCQ, VSA, SA, LA Counts and Marks
The 68 problems sit across five recognised types. The map below shows where the easy marks (MCQ-I) lie and where the conceptual depth (LA + Assertion-Reason) lives.
| Question Type | Question Numbers | Count | Typical Marks |
|---|---|---|---|
| MCQ-I (single correct) | Q1 – Q17 | 17 | 1 each |
| MCQ-II (multiple correct) | Q18 – Q27 | 10 | 2 each |
| Short Answer (SA) | Q28 – Q49 | 22 | 2–3 each |
| Matching Type | Q50 – Q55 | 6 | 2–4 each |
| Assertion & Reason | Q56 – Q65 | 10 | 1 each |
| Long Answer (LA) | Q66 – Q68 | 3 | 5 each |
Note: Short Answer and MCQ-II together carry 32 problems, almost half the Exemplar, so these two types deserve the bulk of your practice budget.
Electrochemistry NCERT Exemplar Video Walkthrough
Source: Magnet Brains on YouTube
What's Inside the Electrochemistry Exemplar PDF
The Electrochemistry Exemplar PDF runs 14 pages (page 33 to page 46 of NCERT Exemplar Problems Chemistry Class 12). Inside, you will find:
- 5 Roman-numeral sections covering MCQ-I, MCQ-II, Short Answer, Matching, Assertion-Reason, and Long Answer.
- Standard electrode potential data tables embedded inside MCQs (Q8, Q55), forcing the student to lift values from a data block rather than recall them.
- Galvanic-cell diagrams in the Long Answer section (Fig. 3.1–3.3) with multi-part questions on polarity, electron flow, and equilibrium.
- Worked answer key at the end of the chapter for every MCQ, MCQ-II, SA, Matching, and Assertion-Reason problem.
How will Collegedunia's Exemplar Book PDF Help You with Electrochemistry?
The Exemplar Book PDF is the highest-yield HOTS resource for this chapter, with extra navigation built around question types.
- Searchable PDF: Jump to any question type (MCQ-II, Assertion-Reason, LA) in two clicks.
- 2026-27 Alignment Note: Every removed-from-textbook topic that still appears in the Exemplar is flagged below, so you skip dropped material.
- JEE / NEET Mapping: The 15–20 Exemplar problems mirrored in recent JEE Main and NEET papers are listed in a dedicated table.
- Expert Verification: Every question is tagged with the NCERT textbook section it draws from, and data values are cross-checked against the official E° table.
Electrochemistry Exemplar vs NCERT Textbook: Difficulty Comparison
The Exemplar problems are visibly harder than the textbook exercise, but predictably so: the Exemplar twists each canonical setup (Daniell cell, Nernst equation, conductivity, electrolysis) by adding one reasoning step.
| Concept | NCERT Textbook | Exemplar Twist |
|---|---|---|
| Standard electrode potential | Look up E° for a single half-cell | Rank four species by reducing power from a 4-value E° data block (Q8–Q12) |
| Nernst equation | Compute Ecell at given ion concentrations | Match the graph of E vs log[Mg2+] to one of four sketches (Q2) |
| Kohlrausch's law | Find Λ°m for a weak electrolyte | Express Λ°m(H2O) as a combination of HCl, NaOH, NaCl molar conductivities (Q22) |
| Electrolysis | Compute mass deposited from Q = It | Predict products at anode and cathode for CuSO4 with Pt vs Cu electrodes (Q23, Q24) |
| Galvanic vs Electrolytic cell | Identify which is which | Couple a 2V galvanic cell to a 1.1V cell and identify which acts as electrolytic (Q66) |
A student who can solve every textbook example for this chapter still loses 4–6 marks on the Exemplar without separate practice.
Electrochemistry Old Syllabus vs 2026-27: What's Kept in the Exemplar
NCERT updated the textbook in 2023 but did not revise the Exemplar Problems book. A few sub-topics that are no longer formally tested still appear in the Exemplar PDF.
- Fully testable in 2026-27 boards: Nernst equation, conductivity and molar conductivity, Kohlrausch's law, electrolysis with both inert and reactive electrodes, EMF and Gibbs energy, fuel cells, lead storage battery, dry cell.
- Exemplar-only / JEE-only: Lechlanche cell construction, mercury cell construction details, corrosion of iron mechanism (still legitimate JEE Main material).
Detailed kept-trimmed-removed table: Electrochemistry Class 12 Chemistry NCERT Book PDF
Why the NCERT Exemplar Matters for JEE / NEET Electrochemistry Prep
Electrochemistry is one of the highest-yield chapters in the JEE / NEET Physical Chemistry block. The Exemplar is the only NCERT-published resource that pitches questions at the entrance-exam level.
- Nernst equation numericals (Q2, Q46, Q64) mirror JEE Main 2024–2025 questions on Ecell vs concentration.
- Conductivity behaviour on dilution (Q41, Q49, Q58, Q59) is a recurring NEET assertion-reason stem.
- Electrolysis product prediction (Q23, Q24, Q34, Q39, Q42) appears in JEE Main almost every year, with CuSO4 / Pt vs Cu the canonical setup.
- Galvanic-cell representation and electron flow (Q33, Q67) is a 4-marker on CBSE Boards and a 4-mark MCQ on JEE Main.
Electrochemistry Top 5 Formulae for Quick Exemplar Recall
The five formulae below cover Q2, Q20, Q22, Q25, Q46, Q49 and most of the Long Answer set. The complete sheet with units and a when-to-use tree lives on the Formula Sheet.
| Quantity | Formula |
|---|---|
| Nernst equation (general) | Ecell = E°cell − (0.059 / n) log Q |
| EMF and Gibbs energy | ΔrG° = −nFE°cell |
| Equilibrium constant and EMF | log Kc = (nE°cell) / 0.059 |
| Conductivity and resistance | κ = (1/R) × (l/A) = G* / R |
| Molar conductivity | Λm = κ / c (or κ × 1000 / c when c is in mol L−1) |
Full master table: Electrochemistry Class 12 Chemistry Formula Sheet
Electrochemistry Exemplar Problems Mapped to JEE Main and NEET
A subset of the 68 Exemplar problems has been mirrored in recent JEE Main and NEET papers, often with identical setups and only number swaps. The 10 highest-impact picks:
| Exemplar Q | Type | Concept | Mirrored in |
|---|---|---|---|
| Q2 | MCQ-I | Nernst equation graph for Mg electrode | JEE Main 2024 Jan, Shift 1 |
| Q8–Q12 | MCQ-I cluster | Ranking from E° data block | NEET 2023, NEET 2025 |
| Q22 | MCQ-II | Λ°m(H2O) by Kohlrausch combination | JEE Main 2025 Apr, Shift 2 |
| Q23, Q24 | MCQ-II | Electrolysis of CuSO4 with Pt vs Cu electrodes | JEE Main 2024 Apr, Shift 1 |
| Q41 | SA | Strong vs weak electrolyte on dilution | NEET 2024 |
| Q46 | SA | Nernst equation for Daniell cell | CBSE Board 2025 |
| Q48 | SA | Lead storage battery discharge | CBSE Board 2024, JEE Main 2023 |
| Q56–Q60 | Assertion-Reason | Conductivity, mercury cell, dilution effects | NEET 2022, NEET 2025 |
| Q66 | LA | Galvanic vs electrolytic when coupled | CBSE Board 2023 |
| Q67 | LA | Zn / Ag galvanic cell, electron flow, equilibrium | CBSE Board 2024, NEET 2023 |
A focused 10-problem set drawn from this map covers roughly 7 of the 12 Electrochemistry marks across CBSE, JEE Main, and NEET 2025.
Electrochemistry Class 12: PYQ Snapshot for CBSE, JEE Main and NEET (2026 → 2021)
The three most-recurring sub-topics in recent years are Nernst equation numericals, electrolysis-product prediction, and conductivity-on-dilution conceptual questions. The full paper-by-paper PYQ map lives on the NCERT Solutions page.
| Year | CBSE Board | JEE Main | NEET |
|---|---|---|---|
| 2026 | - | Conductivity from cell constant (2 Qs) | Pending (exam rescheduled) |
| 2025 | Nernst equation (3 marks) | Kohlrausch's law (1 Q) | Electrolysis prediction (2 Qs) |
| 2024 | Lead storage battery (3 marks) | Electrolysis of CuSO4 (1 Q) | Standard electrode potential ranking (1 Q) |
| 2023 | Galvanic cell representation (5 marks) | Nernst equation (1 Q) | Mercury cell & primary batteries (1 Q) |
| 2022 | Conductivity on dilution (2 marks) | ΔG and EMF (1 Q) | Fuel cell efficiency (1 Q) |
| 2021 | EMF and equilibrium constant (3 marks) | - | - |
Full year-wise PYQ map: Electrochemistry Class 12 Chemistry NCERT Solutions
More Electrochemistry Chemistry Class 12 Resources
- Electrochemistry Class 12 Chemistry NCERT Solutions
- Electrochemistry Class 12 Chemistry Notes
- Electrochemistry Class 12 Chemistry Formula Sheet
- Electrochemistry Class 12 Chemistry NCERT Book PDF
- Electrochemistry Class 12 Chemistry NCERT Exemplar Solutions
- Electrochemistry Class 12 Chemistry Handwritten Notes
NCERT Exemplar Book PDF for Class 12 Chemistry: All Chapters
The table below links every chapter's Exemplar Book PDF, ordered by the 2026-27 NCERT sequence. Use it as a hub for full-subject practice.
| Chapter | Resource |
|---|---|
| Chapter 1 | Solutions Exemplar Book PDF |
| Chapter 3 | Chemical Kinetics Exemplar Book PDF |
| Chapter 4 | The d- and f-Block Elements Exemplar Book PDF |
| Chapter 5 | Coordination Compounds Exemplar Book PDF |
| Chapter 6 | Haloalkanes and Haloarenes Exemplar Book PDF |
| Chapter 7 | Alcohols, Phenols and Ethers Exemplar Book PDF |
| Chapter 8 | Aldehydes, Ketones and Carboxylic Acids Exemplar Book PDF |
| Chapter 9 | Amines Exemplar Book PDF |
| Chapter 10 | Biomolecules Exemplar Book PDF |
Electrochemistry Class 12 Chemistry Exemplar Book PDF FAQs
Ques. Where can I download the Electrochemistry Class 12 Chemistry Exemplar Book PDF?
Ans. You can download the Electrochemistry Class 12 Chemistry NCERT Exemplar Book PDF directly from this page. Both the Normal and HD versions are available, and both are free.
Ques. How many problems does the Class 12 Chemistry Chapter 2 Electrochemistry Exemplar contain?
Ans. The Electrochemistry Exemplar has 68 problems spread across five question types: 17 MCQ-I, 10 MCQ-II, 22 Short Answer, 6 Matching, 10 Assertion-Reason, and 3 Long Answer. The full breakdown is in the question-type table on this page.
Ques. Is the Electrochemistry Exemplar aligned with the 2026-27 NCERT?
Ans. The NCERT Exemplar was not formally revised when the textbook was updated, so it still carries a few sub-topics (Lechlanche cell, corrosion mechanism) that are no longer tested on CBSE Boards. These problems remain useful for JEE Main practice. The kept-vs-trimmed list is in the "Old Syllabus vs 2026-27" section above.
Ques. How many pages is the Class 12th Chemistry Electrochemistry Exemplar Book PDF?
Ans. The Electrochemistry NCERT Exemplar PDF runs 14 pages (page 33 to page 46 of NCERT Exemplar Problems Chemistry Class 12) and covers MCQ-I, MCQ-II, Short Answer, Matching, Assertion-Reason, and Long Answer sets along with the answer key.
Ques. Which Electrochemistry Exemplar problems are most useful for JEE Main and NEET?
Ans. The high-yield set is Q2 (Nernst graph), Q8–Q12 (E° ranking), Q22 (Kohlrausch combination), Q23–Q24 (electrolysis product prediction), Q41 (dilution behaviour), and Q46–Q48 (Daniell cell, lead storage). These ten problems mirror JEE Main 2023–2025 and NEET 2022–2025 question patterns directly.
Ques. How is the Exemplar different from the NCERT textbook for Electrochemistry?
Ans. The textbook exercise tests single-step recall (compute Ecell, find mass deposited). The Exemplar adds one extra reasoning step on each setup, for example asking which of four sketches matches a Nernst E vs log[Mg2+] curve, or asking what happens when a 2V cell is coupled to a 1.1V cell. The "Exemplar vs NCERT Textbook" comparison table on this page lists 5 such twists.
Ques. Are the Exemplar answers given inside the PDF?
Ans. Yes. NCERT prints the answer key for all MCQ-I, MCQ-II, Short Answer, Matching, and Assertion-Reason problems at the end of the chapter (pages 44–46 of the Exemplar). Long Answer hints are also provided. For step-by-step worked solutions, use the Collegedunia Electrochemistry NCERT Exemplar Solutions page linked above.
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