NIOS 313 — Chemistry
This is a complete, free study companion for NIOS 313 — Chemistry — built around what the exam actually asks. The topics examiners repeat most are Physical and Characteristic Properties of Transition Elements, Aldehydes and Ketones: Properties and Reactions, and Amines: Preparation, Properties, Uses and Identification. The syllabus runs to 32 chapters. Below you'll find the full topic-frequency ranking, the exam paper pattern, every chapter, a step-by-step study plan, and the official downloads — everything in one place.
Everything here is free. We're an independent student resource, not the official NIOS body, so always confirm the current syllabus and exam dates on the official NIOS website before you rely on them.
Key information
- Subject code
- 313
- Level
- Class 12
- Programme
- CL12
- Stream
- Science
- Exam
- On-Demand Examination System
- Conducted by
- National Institute of Open Schooling (NIOS)
Most important topics (by past-paper frequency)
| # | Topic | Times asked | Likelihood |
|---|---|---|---|
| 1 | Physical and Characteristic Properties of Transition Elements | 38 | 8.4% |
| 2 | Aldehydes and Ketones: Properties and Reactions | 32 | 7.1% |
| 3 | Amines: Preparation, Properties, Uses and Identification | 32 | 7.1% |
| 4 | Hydrogen Bonding and VSEPR Theory | 26 | 5.7% |
| 5 | Alkaline Earth Metals and Their Important Compounds | 24 | 5.3% |
| 6 | Valence Bond Theory | 24 | 5.3% |
| 7 | Electrolytic Conduction and Conductivity | 22 | 4.9% |
| 8 | Carboxylic Acids | 22 | 4.9% |
| 9 | Sulphuric Acid | 21 | 4.6% |
| 10 | Properties and Reactions of Haloalkanes and Haloarenes | 21 | 4.6% |
| 11 | Percentage Composition and Empirical Formulae | 20 | 4.4% |
| 12 | Wave Mechanical Model, Quantum Numbers and Orbitals | 20 | 4.4% |
Based on how often each topic appeared in official previous-year question papers.
Exam paper pattern
| Section | What to expect |
|---|---|
| Q1-Q16 | Answer all questions by selecting the most appropriate option from the four choices given. |
| Q17-Q28 | Answer all objective questions as instructed. This group includes fill in the blanks, true or false, passage-based questions, match the following, and completion or balancing based items, usually with small subparts. |
| Q29-Q37 | Answer all questions in about 30 to 50 words each. Attempt only one alternative where an internal choice is given. |
| Q38-Q41 | Answer all questions in about 50 to 80 words each. Attempt only one alternative where an internal choice is given. |
| Q42-Q43 | Answer both questions in about 80 to 120 words each. Each question has subparts, and where an internal choice is given, attempt only one option. |
What you will study (chapters)
- Chapter 1
- Atoms, Molecules and Chemical Arithmetic
- Chapter 2
- Atomic Structure
- Chapter 3
- Periodic Table and Periodicity in Properties
- Chapter 4
- Chemical Bonding
- Chapter 5
- The Gaseous and Liquid State
- Chapter 6
- The Solid State
- Chapter 7
- Solutions
- Chapter 8
- Colloids
- Chapter 9
- Chemical Thermodynamics
- Chapter 10
- Spontaneity of Chemical Reactions
- Chapter 11
- Chemical Equilibrium
- Chapter 12
- Ionic Equilibrium
- Chapter 13
- Electrochemistry
- Chapter 14
- Chemical Kinetics
- Chapter 15
- Adsorption and Catalysis
- Chapter 16
- Occurrence and Extraction of Metals
- Chapter 17
- Hydrogen and S-Block Elements
- Chapter 18
- General Characteristics of the P-Block Elements
- Chapter 19
- P-Block Elements and Their Compounds - I
- Chapter 20
- P-Block Elements and Their Compounds - II
- Chapter 21
- D-Block and F-Block Elements
- Chapter 22
- Coordination Compounds
- Chapter 23
- Nomenclature and General Principles
- Chapter 24
- Hydrocarbons
- Chapter 25
- Compounds of Carbon Containing Halogens (Haloalkanes and Haloarenes)
- Chapter 26
- Alcohols, Phenols and Ethers
- Chapter 27
- Aldehydes, Ketones and Carboxylic Acids
- Chapter 28
- Compounds of Carbon Containing Nitrogen
- Chapter 29
- Biomolecules
- Chapter 30
- Drugs and Medicines
- Chapter 31
- Soap, Detergents and Polymers
- Chapter 32
- Environmental Chemistry
Official textbook
- NIOS 313 — Chemistry — official textbook / study material — Free download from the official source.
How to study NIOS 313 — Chemistry and score well
- Start with the highest-frequency topics — In NIOS 313 — Chemistry, Physical and Characteristic Properties of Transition Elements, Aldehydes and Ketones: Properties and Reactions, Amines: Preparation, Properties, Uses and Identification, and Hydrogen Bonding and VSEPR Theory appear again and again in past papers. Master these first — they return the most marks for the time you put in.
- Learn how the paper is set — The NIOS 313 — Chemistry paper is split into sections (see the exam pattern above). Knowing the marks each section carries tells you how long to spend on each — then practise to that timing.
- Practise with previous-year papers — Solve the last 5–10 years of NIOS NIOS 313 — Chemistry papers under timed, exam-like conditions. Past papers show exactly which topics repeat and how questions are worded.
- Revise actively, not passively — Write a one-page summary for each of the 32 chapters — key definitions, formulas and the points examiners reward — then re-test yourself instead of re-reading.
- Mark your answers with the official scheme — After each practice paper, score yourself against the official marking scheme. It shows how marks are awarded step-by-step, so you learn to present answers the way examiners expect.
Exam tips: how to score higher in NIOS 313 — Chemistry
Where students lose marks: rushing the high-weightage questions, skipping the steps the marking scheme rewards, and saving easy sections for last. Read the whole paper first, attempt your strongest section early to bank marks, and always show your working.
Manage your time: split your time in proportion to the marks each section carries, keep a few minutes at the end to check, and never leave a question blank — a partial, structured answer still earns partial marks.
Frequently asked questions
What are the most important topics in NIOS 313 — Chemistry?
Based on past papers, the most frequently asked topics include Physical and Characteristic Properties of Transition Elements, Aldehydes and Ketones: Properties and Reactions, Amines: Preparation, Properties, Uses and Identification. The full ranked list with how often each appears is in the "Most important topics" section above.
Where can I download NIOS 313 — Chemistry previous-year question papers?
Official NIOS previous-year question papers are available on the official NIOS website. Open the Question Papers section for the direct link, plus the exam pattern and the topics that repeat most.
How can I prepare for NIOS 313 — Chemistry faster?
Start with the highest-frequency topics, learn the exam pattern so you know how each section is marked, and practise with past papers. A subject-aware study tutor can quiz you on exactly these topics.
A Gyani AI tutor trained on the NIOS 313 — Chemistry syllabus and past papers can quiz you on the most-asked topics and show you exactly what to revise.