NIOS Class 12 Chemistry 313 Question Paper (Set A, Set B & Set C) October 2025 – Complete Analysis, Weightage, Topics & Preparation Guide for 2026
The NIOS Class 12 Chemistry 313 Question Paper of October 2025, covering Set A, Set B, and Set C, gives a very clear picture of how NIOS evaluates chemistry students. The paper is concept-oriented, balanced, and strictly based on the prescribed syllabus. This detailed analysis explains the paper structure, section-wise distribution, topic weightage, and preparation strategy for students appearing in the 2026 examination.
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Quick Summary
This comprehensive guide on the NIOS Class 12 Chemistry 313 Question Paper explains the complete exam pattern of Set A, Set B, and Set C. It includes section-wise analysis, topic-wise weightage, comparison between sets, expected trends for 2026, and preparation guidance. Students looking for clarity, accuracy, and exam-focused direction will find this analysis highly useful.
Overview Table: NIOS Class 12 Chemistry 313 Exam (October 2025)
| Particulars | Details |
|---|---|
| Subject | Chemistry (313) |
| Class | 12th |
| Board | National Institute of Open Schooling (NIOS) |
| Question Paper Sets | Set A, Set B, Set C |
| Exam Month | October 2025 |
| Total Marks | 80 |
| Time Duration | 3 Hours |
| Total Questions | 43 |
| Question Types | MCQs, Objective, Very Short, Short, Long Answer |
| Medium | English / Hindi |
Understanding the NIOS Chemistry 313 Question Paper Pattern
The NIOS Chemistry 313 Question Paper is carefully designed to test conceptual clarity, numerical accuracy, reaction understanding, and application of chemical principles. All three sets followed the same blueprint, with only question order and numerical values changed.
The paper is not unpredictable. Students who study the syllabus properly and practise previous papers can comfortably score well.
NIOS Class 12 Chemistry 313 Question Paper (Set A) October 2025
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NIOS Class 12 Chemistry 313 Question Paper (Set B) October 2025
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NIOS Class 12 Chemistry 313 Question Paper (Set C) October 2025
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Structure of the NIOS Class 12 Chemistry Question Paper
Section-Wise Exam Structure
| Section | Question Type | Marks Distribution |
|---|---|---|
| Section A | MCQs | 16 Marks |
| Section B | Objective Type | 24 Marks |
| Section C | Very Short Answer | 18 Marks |
| Section D | Short Answer | 12 Marks |
| Section E | Long Answer | 10 Marks |
This structure is expected to remain the same for 2026.
Section A: Objective Type Questions (MCQs)
Section A consisted of 16 MCQs in all three sets. These questions tested fundamental chemistry concepts rather than tricky logic.
Commonly Asked Areas
- Polymers and biomolecules
- Hybridisation and molecular geometry
- Atomic structure basics
- Coordination compounds
- Environmental chemistry
These questions were direct. Students with a clear NCERT-level understanding could score full marks.
Section B: Objective Type Questions (2 Marks Each)
This section required short, structured responses like True/False, matching columns, completing reactions, and short explanations.
Frequently Tested Concepts
- Substitution reactions in haloalkanes
- Soaps and detergents
- Oxidation reactions using KMnOâ‚„
- Magnetic behaviour of transition elements
- Environmental chemistry applications
Answers needed clarity, not length.
Section C: Very Short Answer Questions
Section C focused on definitions, laws, numerical basics, and short reasoning.
Topics Seen Across All Sets
- Henry’s law and osmotic pressure
- Buffer solutions
- pH calculations
- Thermodynamics laws
- Electrochemistry basics
Students who wrote crisp, to-the-point answers scored better.
Section D: Short Answer Questions
This section tested a deeper understanding and application.
Important Areas
- Chemical kinetics and conductivity
- Colligative properties
- Common ion effect
- Transition element properties
Logical explanation and proper chemical terms were essential.
Section E: Long Answer Questions
This section decides the rank and overall score.
High-Weight Topics
- Coordination compounds and isomerism
- Organic name reactions
- Acidic strength comparison
- Conversion reactions
- Numerical problems from solutions
Step-wise answers and correct equations mattered more than writing lengthy text.
Topic-Wise Coverage in Chemistry 313 (October 2025)
Physical Chemistry
- Solutions
- Electrochemistry
- Thermodynamics
- Chemical kinetics
Organic Chemistry
- Haloalkanes and haloarenes
- Alcohols and phenols
- Aldehydes and ketones
- Amines and biomolecules
Inorganic Chemistry
- Coordination compounds
- d- and f-block elements
- Environmental chemistry
All three sets covered these areas almost evenly.
NIOS Class 12 Chemistry Question Paper Weightage 2025
| Unit | Approximate Weightage |
|---|---|
| Physical Chemistry | 30–35 Marks |
| Organic Chemistry | 25–30 Marks |
| Inorganic Chemistry | 15–20 Marks |
This balance is expected to continue in 2026.
Comparison Between Set A, Set B, and Set C
| Aspect | Set A | Set B | Set C |
|---|---|---|---|
| Difficulty Level | Moderate | Moderate | Moderate |
| Numerical Focus | High | High | High |
| Organic Depth | Balanced | Balanced | Balanced |
| Inorganic Theory | Direct | Direct | Direct |
| Paper Length | Manageable | Manageable | Manageable |
No set was tougher than the others. The preparation level decided the performance.
NIOS Class 12 Chemistry Question Paper Download PDF – Why It Matters
Students searching for the NIOS Class 12 Chemistry Question Paper download PDF usually want to practise real exam-level questions. Solving actual papers helps in understanding:
- Question framing
- Step-wise marking
- Time management
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Eligibility Criteria for NIOS Class 12 (2026)
| Requirement | Details |
|---|---|
| Minimum Age | 16 Years |
| Qualification | Class 10 or equivalent |
| Mode | Open Schooling |
| Medium | English / Hindi |
Important Dates for NIOS 2026 (Expected)
| Event | Tentative Timeline |
|---|---|
| Admission Window | January – March 2026 |
| Exam Form Submission | August – September 2026 |
| October Exam | October 2026 |
| Result Declaration | December 2026 |
How Unnati Education Supports Chemistry Students
Unnati Education supports NIOS Chemistry students with exam-pattern-based guidance and structured preparation.
Support includes:
- Solved Chemistry question papers
- Concept-wise explanation
- Numerical practice support
- Guidance for NIOS Class 12 previous year question paper solving
- Help with NIOS TMA Class 12Â preparation.
Deep Section-Wise Scoring Strategy for NIOS Class 12 Chemistry 313 (Set A, Set B & Set C)
After closely analysing all three sets of the October 2025 Chemistry 313 question papers, one reality becomes clear. Chemistry is not difficult in NIOS, but it is unforgiving if concepts and methods are weak. Marks are decided by accuracy, clarity, and balance, not by memorisation.
How to Score High in Physical Chemistry
Physical Chemistry carried the highest and most stable weightage across Set A, Set B, and Set C.
What NIOS Tested Repeatedly
- Numerical problems based on formulas
- Step-wise calculations
- Unit-based answers
- Law-based conceptual clarity
Most Scoring Chapters
- Solutions
- Electrochemistry
- Thermodynamics
- Chemical Kinetics
Smart Scoring Method
- Always write the formula first.
- Substitute values clearly
- Show calculation steps neatly.
- Mention correct units
Even if the final value is slightly wrong, correct steps fetch partial marks.
Organic Chemistry: Logic Over Rote Learning
Organic chemistry questions were reaction-oriented and application-based in all three sets.
What Examiners Focused On
- Reaction mechanism understanding
- Correct reagents and conditions
- Conversion logic
- Balanced chemical equations
Common Student Mistake
Many students memorised reactions without understanding why the reaction occurs. This led to incomplete or incorrect answers.
How to Improve Scores
- Learn reactions with conditions.
- Practice conversions daily
- Write reactions in proper sequence.
- Avoid skipping the intermediate steps.
Simple explanations score better than complex language.
Inorganic Chemistry: Easy Marks If Prepared Properly
Inorganic chemistry questions were theory-based and predictable.
Frequently Repeated Topics
- Coordination compounds
- Isomerism
- Magnetic behaviour
- d- and f-block elements
- Environmental chemistry
Examiner Expectation
- Clear definitions
- Logical reasoning
- Correct terminology
Inorganic chemistry is ideal for revision-based scoring before the exam.
Numerical Questions: Rank-Deciding Factor
Numerical questions appeared consistently in all sets and carried heavy weight.
Pattern Observed
- At least two numericals were compulsory
- The difficulty level was moderate.
- Step marking was strict.
Best Practice Strategy
- Practice the numericals from each chapter
- Focus on method, not speed.
- Do not skip units
- Avoid rough calculations
Neat handwriting and spacing help examiners follow the solution easily.
Section-Wise Time Management Strategy
| Section | Recommended Time |
|---|---|
| MCQs (Section A) | 25 minutes |
| Objective (Section B) | 35 minutes |
| Very Short Answers | 40 minutes |
| Short Answers | 45 minutes |
| Long Answers | 55 minutes |
| Revision | 20 minutes |
Time discipline alone can improve scores by 10–12 marks.
Common Mistakes Students Made in October 2025 (Across All Sets)
Many students:
- Skipped calculation steps
- Forgot to mention units
- Overwrote theory answers
- Ignored inorganic chemistry
- Mismanaged time in long answers
Avoiding these mistakes is more powerful than studying extra topics.
Set-Wise Mistake Pattern Comparison
| Area | Set A | Set B | Set C |
|---|---|---|---|
| Numericals | Calculation slips | Unit mistakes | Incomplete steps |
| Organic | Wrong reagents | Poor conditions | Missing equations |
| Inorganic | Ignored theory | Vague answers | Memorised text |
| Time | Rushed ending | Section imbalance | Long theory writing |
Understanding these patterns gives a strong edge in 2026.
Expected Trends for NIOS Chemistry 313 Exam 2026
Based on October 2025 papers, students can confidently expect:
- Same exam structure
- Similar topic weightage
- Continued focus on numericals
- Repetition of core concepts
NIOS follows consistency and avoids sudden surprises.
Smart 2026 Preparation Plan for Chemistry 313
Daily Routine
- 30 minutes of numerical practice
- 20 minutes of theory revision
- 10 minutes reaction writing
Weekly Routine
- One full-length test
- One organic conversion sheet
- One inorganic revision cycle
Consistency matters more than long study hours.
Presentation Tips That Increase Chemistry Marks
- Write reactions clearly and neatly.
- Leave space between steps.
- Underline final answers
- Draw diagrams only when required.
Chemistry answers are judged visually as well as conceptually.
How Unnati Education Supports Chemistry Students
Unnati Education supports NIOS Chemistry students with exam-oriented guidance based on real question paper analysis.
Support includes:
- Solved Chemistry question papers
- Step-wise numerical guidance
- Reaction and conversion support
- Help with NIOS previous year question paper Class 12Â practice
- Assistance for NIOS Class 12 TMA preparation
For academic support, students can contact:
Phone/WhatsApp: 9654279279, 9899436384
Frequently Asked Questions (FAQs)
Q1. Is the NIOS Class 12 Chemistry 313 Question Paper difficult for average students?
The Chemistry 313 paper is not difficult if students prepare conceptually. Questions are syllabus-based and predictable. Average students who practise numericals, revise reactions, and understand core concepts can score well without stress or confusion.
Q2. Which section is the most scoring in Chemistry 313?
Physical chemistry numericals are the most scoring section. They follow fixed formulas and clear step marking. Students who practise numericals regularly can secure high marks even if their theory answers are average.
Q3. How important are previous year question papers for Chemistry preparation?
Previous year papers are extremely important because NIOS repeats patterns and concepts. Practising them helps students understand question framing, marking style, and time management, which directly improves exam performance.
Q4. Can any unit be skipped safely in Chemistry 313?
No unit should be skipped completely. Even smaller chapters contribute to MCQs or short answers. Balanced preparation across physical, organic, and inorganic chemistry is essential for safe and consistent scoring.
Q5. Can Chemistry be prepared well in the last three months before the exam?
Yes, Chemistry can be prepared effectively in three months with a focused plan. Regular numerical practice, reaction revision, and solving previous papers are enough to achieve a strong and confident score.
Final Conclusion
The NIOS Class 12 Chemistry 313 Question Paper of October 2025 across Set A, Set B, and Set C clearly proves that success depends on conceptual clarity, numerical accuracy, and structured answers rather than memorisation. Students preparing for 2026 should focus on balanced preparation, regular revision, and real exam-level practice.
Unnati Education provides Chemistry solutions, NIOS TMAs, and NIOS previous year question papers to help students prepare with confidence. If you need solved papers, numerical guidance, or academic support, you can contact Unnati Education for reliable assistance.
