Class 12 Chemistry Chapter 1 Solutions packs nearly 60 graded problems across MCQ-I, MCQ-II, Short-Answer and Long-Answer in the official NCERT Exemplar, far more than the 41 questions inside the rationalised 2026-27 NCERT textbook itself. The Collegedunia Exemplar PDF on this page mirrors that workload and adds JEE Main and NEET tagging.
- CBSE Weightage: 6 to 8 marks (one numerical plus one short-answer is the standard split)
- JEE Main Weightage: 3 to 4% (one or two questions per shift on Raoult's law, colligative properties, or van't Hoff factor)
- NEET Weightage: 2 to 3 questions per year, almost always on osmotic pressure, depression of freezing point, or abnormal molar mass
You can find the complete Exemplar Book PDF for Solutions Class 12 Chemistry on this page, along with the question-type distribution, exemplar-versus-textbook difficulty notes, and the JEE Main and NEET mapping below.
The Collegedunia NCERT Exemplar Book PDF on this page is curated by subject experts, mapped to the 2026-27 Class 12 Chemistry syllabus, and refined against the last five years of CBSE Board, JEE Main and NEET papers.
Also Check:
- Solutions Class 12 Chemistry NCERT Exemplar Solutions
- Solutions Class 12 Chemistry NCERT Solutions
- Solutions Class 12 Chemistry NCERT Book PDF
Solutions Class 12 Chemistry NCERT Exemplar Question-Type Breakdown
The Solutions chapter in the NCERT Exemplar is one of the most balanced in the entire Class 12 Chemistry book: every question type from one-mark MCQ-I up to a five-mark Long-Answer makes an appearance, and the share of numerical Short-Answer questions is unusually high because of how naturally colligative-property problems chain into multi-step working.
| Question Type | Count | Marks each | Typical focus |
|---|---|---|---|
| MCQ-I (single correct) | 16 | 1 | Definitions, ideal vs non-ideal, sign of i, units of concentration |
| MCQ-II (multiple correct) | 5 | 2 | Henry's-law gases, azeotrope behaviour, positive-deviation pairs |
| Very Short Answer (VSA) | 10 | 1 | One-line distinctions, formula recall, single-step calculations |
| Short Answer (SA) | 20 | 2–3 | Numericals on molarity, molality, freezing-point depression, vapour-pressure lowering |
| Long Answer (LA) | 4 | 5 | Multi-part osmotic-pressure problems, abnormal molar mass with van't Hoff factor, derivation-style proofs |
| Matching / Assertion-Reason | 3 | 1–2 | Concept-pairing, dilute-solution assumptions |
Around 60% of the marks in this chapter's Exemplar set come from Short-Answer numericals, so a student who can comfortably do molality, mole-fraction and freezing-point depression in under three minutes has already locked in the bulk of the score.
Solutions NCERT Exemplar Video Walkthrough
Source: Sourabh Raina on YouTube
What's Inside the Solutions Exemplar Book PDF
The Collegedunia Exemplar Book PDF on this page is the official NCERT Exemplar chapter for Solutions, re-typeset with cleaner figure labels and one-line topic tags above each question. The contents are:
- Section-1.1 to Section-1.9 question mapping (so you can attempt only those questions whose topic you have just revised)
- 16 MCQ-I + 5 MCQ-II + 10 VSA + 20 SA + 4 LA + 3 Match-the-Column / Assertion-Reason — 58 problems in total
- Six topic-tags used throughout: Concentration units, Solubility & Henry's law, Vapour pressure & Raoult's law, Ideal vs non-ideal, Colligative properties, Abnormal molar mass & van't Hoff factor
- Boxed formulae carried at the top of every two-page spread
- JEE Main / NEET inspiration markers next to questions that have appeared in recent entrance papers
How will Collegedunia's NCERT Exemplar Book PDF Help You with Solutions?
The Exemplar by itself is a question paper, not a study book. The Collegedunia layered version on this page does the orientation work for you:
- 2026-27 NCERT Alignment: Every Exemplar question is labelled with its corresponding section number from the rationalised Class 12 Chemistry textbook, so deleted topics never enter your revision queue.
- Difficulty Step-Up Markers: Each problem carries a one-to-three dot rating that flags how far above the textbook level it sits, useful when triaging in the last two weeks.
- Expert Verification: Numerical answers and the choice of significant figures have been re-checked against the official NCERT key and against JEE Main 2025 marking standards.
- JEE / NEET Cross-References: Where a problem has reappeared (often paraphrased) in JEE Main or NEET, the year and paper is noted below the question.
Solutions Top 5 Formulae for Quick Recall
Five formulae carry roughly 80% of the numerical workload in the Exemplar. Internalising these five is the single highest-leverage step before attempting the SA and LA pool. The complete master sheet with units, dimensional checks and decision-tree picks sits on the dedicated Collegedunia Formula Sheet.
| Quantity | Formula | Common use |
|---|---|---|
| Molality | m = nsoluteWsolvent (kg) | Freezing-point depression and boiling-point elevation problems |
| Mole fraction (solute) | x2 = n2n1 + n2 | Raoult's law for vapour-pressure lowering |
| Relative lowering of vapour pressure | p10 - p1p10 = x2 | Determining molar mass of non-volatile solute |
| Osmotic pressure | π = i · C · R · T | Biological and dilute-solution problems; i matters for electrolytes |
| van't Hoff factor | i = observed colligative propertycalculated colligative property | Abnormal molar mass for associating or dissociating solutes |
Full master table: Solutions Class 12 Chemistry Formula Sheet
Solutions Exemplar vs NCERT Textbook: Difficulty Step-Up
The Exemplar lifts the standard NCERT setup by adding either an extra unknown, a non-ideal twist, or a unit-conversion trap. Three quick comparisons make the pattern obvious.
| Concept | NCERT textbook ask | Exemplar twist |
|---|---|---|
| Freezing-point depression | Find Tf given mass and Kf | Find Kf backwards, with an associating or dissociating solute requiring the van't Hoff factor |
| Raoult's law for two volatile liquids | Total vapour pressure of an ideal mixture | Predict whether the mixture is ideal, positive-deviation or negative-deviation; justify with intermolecular-force argument |
| Henry's law | Calculate solubility of a gas at given pressure | Compare KH values across four gases at a fixed temperature and rank the solubilities, then explain the physical reason |
Related Links:
Why the NCERT Exemplar Matters for JEE and NEET Solutions Prep
For Class 12th Chemistry, the Solutions chapter is one of the most reliably tested in both JEE Main and NEET, and the Exemplar problem bank doubles as an entrance-prep workbook because almost every twist that a JEE or NEET paper-setter adds is already present in the Exemplar.
- Three out of the last five JEE Main January-session shifts have carried a question that maps verbatim onto an Exemplar MCQ-II from this chapter.
- NEET 2025 carried two questions on osmotic pressure and depression of freezing point that follow the same setup as Exemplar LA-1 and SA-15.
- The Exemplar's matching-column items train recognition of azeotropes and Henry's-law gases, which is exactly the assertion-reason format JEE Main now uses.
- Working the LA pool builds the multi-step stamina needed for the 25-second-per-question pace of NEET.
Solutions Exemplar Always-On: Old vs Rationalised Syllabus
An important framing point that the NCERT itself does not surface: the NCERT Exemplar Problems book has not been re-published after the 2024 rationalisation. The Exemplar PDF you download still carries problems on topics that the new edition has trimmed or removed, so blind attempting wastes time.
Detailed kept-trimmed-removed table: Solutions Class 12 Chemistry NCERT Book PDF
Solutions Exemplar JEE Main and NEET Question Mapping
The table below shows how often Solutions-chapter Exemplar problems have been adapted by recent JEE Main and NEET papers. The pattern is consistent: paper-setters lift the setup, change the numbers, and reuse the conceptual hook.
| Year | Exam | Concept lifted | Exemplar Q-type counterpart |
|---|---|---|---|
| 2025 | JEE Main (Jan, Shift 1) | Vapour-pressure lowering for non-volatile solute | SA-12 / SA-13 |
| 2025 | NEET | Osmotic pressure with van't Hoff factor | LA-2 |
| 2024 | JEE Main (April) | Henry's-law constant ranking | MCQ-II Q-3 |
| 2024 | NEET | Depression in freezing point of an electrolyte | SA-17 |
| 2023 | JEE Main | Positive-deviation pair identification | MCQ-II Q-4 |
| 2022 | NEET | Molarity-vs-molality temperature-dependence framing | VSA-6 |
Every Exemplar attempt is therefore double duty: it tightens your board answer-writing and rehearses the exact concept that an entrance paper-setter is likely to reuse the same year.
Full year-wise PYQ map: Solutions Class 12 Chemistry NCERT Solutions
Solutions Weightage Compared Across Class 12 Chemistry Chapters
The visual below maps the typical CBSE Board marks distribution across all 10 chapters of the rationalised 2026-27 Class 12 Chemistry NCERT, averaged over the last five board papers. Solutions sits comfortably in the upper band alongside Coordination Compounds.
More Solutions Chemistry Class 12 Resources
NCERT Exemplar Book PDF for Class 12 Chemistry: All Chapters
The table below lists the Exemplar Book PDFs Collegedunia hosts for every chapter of the rationalised 2026-27 Class 12 Chemistry syllabus.
| Chapter | Resource |
|---|---|
| Chapter 2 | Electrochemistry 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 |
Solutions Class 12 Chemistry Exemplar Book PDF FAQs
Ques. Where can I download Solutions Class 12 Chemistry NCERT Exemplar Book PDF?
Ans. You can download the Solutions Class 12 Chemistry NCERT Exemplar Book PDF directly from this page. Both the Normal and HD versions are available, and both are free.
Ques. Is the Solutions Exemplar PDF aligned with the 2026-27 NCERT?
Ans. Yes. The Solutions chapter was retained almost intact in the new NCERT edition, so every Exemplar question for this chapter is still in syllabus. The only structural change is that Solutions is now Chapter 1 in the Class 12 Chemistry book (it was Chapter 2 in the old edition).
Ques. How many pages is the Class 12th Chemistry Solutions Exemplar Book PDF?
Ans. The Exemplar Book PDF for Solutions runs approximately 11 pages and carries 58 graded problems split across MCQ-I, MCQ-II, VSA, SA and LA, plus a small set of matching and assertion-reason items.
Ques. How many questions are in the Solutions chapter NCERT Exemplar?
Ans. The Solutions Exemplar contains 58 problems: 16 MCQ-I, 5 MCQ-II, 10 VSA, 20 SA, 4 LA, and 3 matching or assertion-reason items. Roughly 60% of the marks come from the Short-Answer numerical pool.
Ques. Is the NCERT Exemplar enough for JEE Main and NEET preparation for Solutions?
Ans. For the Solutions chapter, the Exemplar is unusually well-aligned with the entrance pattern. Three of the last five JEE Main shifts and the last two NEET papers have used setups that map directly onto Exemplar MCQ-II and LA items. The Exemplar is therefore a strong supplement to the NCERT textbook, though serious aspirants still pair it with a topic-tagged JEE archive.
Ques. What is the difference between the NCERT textbook problems and the NCERT Exemplar for Solutions?
Ans. The textbook problems usually test one concept per question (e.g. apply Raoult's law). The Exemplar adds a twist: an extra unknown, a non-ideal mixture, or a back-calculation step. Exemplar Long-Answer items also chain two formulas (e.g. find molar mass from freezing-point depression, then identify the organic solute).
Ques. Which topics in the Solutions Exemplar are most important for CBSE Board exams?
Ans. Three sub-topics dominate the CBSE pattern for this chapter: depression in freezing point, relative lowering of vapour pressure with Raoult's law, and osmotic pressure with van't Hoff factor for electrolytes. Exemplar SA-12 through SA-20 cover these exhaustively.
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