Key Takeaways
- Chemistry is 70 marks theory plus 30 marks practical. The board exam is a single annual exam expected in February-March 2027; the date sheet is expected around November-December 2026.
- Organic chemistry is a system, not a list: learn each functional group's reactions as a map of conversions, with reagents and conditions attached.
- Physical chemistry marks are earned by units, correct formula choice and a clean final line. Practise a few numericals from solutions, electrochemistry and kinetics every day.
- In the inorganic portion, exceptions and their reasons are the most-asked content. Keep a short exception sheet and add to it from every mock.
- As per the pattern reported for 2026-27, about 50 percent of questions are competency-based; check the current sample paper. Reasoning-style answers earn more than pure recall.
How Chemistry Is Framed in the Board Paper
Chemistry rewards students who can move between three modes: recall (a named reaction with its reagent), calculation (a numerical with a unit) and explanation (why a phenomenon happens). A student strong in one mode and weak in another usually ends up losing marks in a predictable place. The good news is that each mode has its own revision method. Board-year Chemistry is also a fairly compact syllabus, so a focused plan can cover all of it more than once before the exam.
The topics listed here follow the current Class 12 NCERT-based syllabus as we understand it: solutions, electrochemistry, chemical kinetics, d- and f-block elements, coordination compounds, haloalkanes and haloarenes, alcohols, phenols and ethers, aldehydes, ketones and carboxylic acids, amines, and biomolecules. Syllabus portions have been rationalised in recent years, so confirm the exact list against the current CBSE curriculum before you plan around it. We are not giving unit-wise mark weightage; use the current sample paper for that.
The Area-by-Area Revision Table
| Area | What boards test | How to revise |
|---|---|---|
| Solutions | Concentration terms, Raoult's law, colligative properties, van't Hoff factor, and numericals on molar mass from a property change. | Do five numericals daily, unit-first. Keep a table of all four colligative properties and when to apply the van't Hoff factor. |
| Electrochemistry | Nernst equation, cell EMF, conductivity and molar conductivity, Kohlrausch's law, Faraday's laws and the link between EMF and free energy. | Write the cell notation and half reactions first. Track the number of electrons, n, and the units of conductivity in every solution. |
| Chemical kinetics | Order and molecularity, integrated rate laws for zero and first order, half-life, the Arrhenius equation and graphs. | Memorise units of k for each order. Practise reading a rate law from data and sketching concentration-time graphs. |
| d- and f-block | Electronic configurations and their exceptions, oxidation states, trends in properties, lanthanoid contraction, and preparation and reactions of potassium permanganate and dichromate. | Keep a one-page exception sheet with reasons. Write the reactions of permanganate in acidic, neutral and alkaline media. |
| Coordination compounds | IUPAC naming, isomerism, valence bond and crystal field explanations, magnetic behaviour and colour. | Practise ten names and formulas a day both ways. Draw the splitting diagrams for octahedral complexes and fill electrons for weak and strong fields. |
| Haloalkanes and haloarenes | Substitution and elimination mechanisms, stereochemistry, and named reactions such as Finkelstein, Swarts and Sandmeyer. | Write mechanisms with curved arrows. Keep a comparison chart of SN1 and SN2 with reasons for the rate order. |
| Alcohols, phenols and ethers | Preparation and reactions, acidity of phenols, and named reactions such as Reimer-Tiemann, Kolbe and Williamson. | Learn reagents as pairs: substrate plus reagent gives product. Practise distinguishing tests between alcohols and phenols. |
| Aldehydes, ketones and carboxylic acids | Nucleophilic addition, aldol, Cannizzaro, Rosenmund, Stephen, Etard, Clemmensen and Wolff-Kishner, and acidity of carboxylic acids. | Build a conversion map on one sheet. Test yourself with blank-start conversions such as ketone to alcohol to acid. |
| Amines | Basicity order, Gabriel phthalimide, Hoffmann bromamide, carbylamine test, diazonium salts and their reactions. | Learn the basicity trend with reasons. Draw a diazonium-salt product map covering Sandmeyer, Gattermann and coupling. |
| Biomolecules | Structures of carbohydrates, protein levels, enzymes, vitamins and nucleic acids at the NCERT level. | Read the NCERT text line by line, redraw the key structures, and make a short glossary of terms and examples. |
Organic: Treat Name Reactions as a Map
Most students learn organic chemistry as a pile of reactions and forget half of them under pressure. A better approach is to organise by functional group and by conversion. For each functional group, draw a hub-and-spoke diagram: the group in the middle, arrows to what it can become, with reagent and condition on every arrow. Then practise conversions blind: take two compounds and connect them in the fewest steps. Board conversions usually reward a correct sequence with correct reagents, and a small slip in one reagent costs less than a missing step.
- Group the named reactions by what they do. Chain-extending reactions (aldol), oxidation and reduction (Cannizzaro, Clemmensen, Wolff-Kishner) and substitution (Finkelstein, Swarts, Williamson) each follow a pattern that is easier to hold in memory as a family.
- Attach a hook to every reaction. For Cannizzaro, the hook is: an aldehyde with no alpha hydrogen, concentrated alkali, one molecule oxidised and one reduced.
- Practise mechanisms you are likely to be asked for. Even if a question does not require it, drawing the mechanism for nucleophilic addition or SN1 and SN2 helps you answer why-type questions.
- Learn the distinguishing tests. Tests for aldehydes versus ketones, alcohols versus phenols, and primary versus secondary versus tertiary amines are quick marks when you have them ready.
- Write the equations, do not just read them. Reagents, conditions and balancing are where marks disappear.
Physical: Numericals Are a Daily Habit
Physical chemistry rewards repetition. A student who does a few numericals daily for a month will usually outperform one who does thirty in a single weekend. The rules of the game are simple: identify what is given, choose the formula and check its conditions, convert units before substituting, and end with a clean line with the correct unit. The most common errors are also simple: using molality when molarity is needed, forgetting the van't Hoff factor, taking the wrong n in the Nernst equation, or writing a rate constant with the wrong unit.
- Solutions: keep a one-page list of formulas with the symbol for each quantity and its unit. Practise molar mass determination from all four colligative properties.
- Electrochemistry: decide the anode and cathode first, then write the standard potentials, then the cell EMF, then the Nernst correction if concentrations are given.
- Kinetics: be fluent in first-order calculations, half-life and the Arrhenius equation. Practise reading values off a graph.
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Inorganic: Exceptions and Reasons
In the current Class 12 syllabus, the inorganic portion is dominated by the d- and f-block elements and coordination compounds. Board questions in this area repeatedly ask for a reason: why is chromium's configuration what it is, why do transition metals form coloured compounds, why does the lanthanoid contraction matter, why is a complex diamagnetic while another is paramagnetic. Keep a short exception sheet and, next to every entry, write the reason in one sentence. The two well-known configuration exceptions in the first transition series are chromium and copper, and the reason is the extra stability of half-filled and fully filled d subshells. Similar one-line reasons cover most of the theory.
For coordination compounds, most marks are secured through a few skills: naming a complex correctly, writing its formula from the name, identifying the type of isomerism, and explaining bonding using either valence bond or crystal field theory. The spin-only magnetic moment formula and the count of unpaired electrons are worth practising alongside the diagrams.
The 30 Practical Marks
Chemistry carries 30 marks for practical work. It typically includes volumetric analysis, salt analysis, a content-based experiment, an investigatory project, and the record and viva, though the exact split is set by the current CBSE practical syllabus and your school. Salt analysis and titration reward students who have actually practised them, so book lab time early. Keep the record file up to date, learn the confirmatory tests for each ion in your list, and prepare short verbal answers for the viva, such as why an indicator changes colour at the endpoint.
Competency-Based Questions in Chemistry
Expect passages, assertion-reason items and applications. A case might describe a fuel cell, a metal corrosion scenario or a drug and ask you to use ideas from electrochemistry or biomolecules. The way to prepare is to ask why after every reaction and every property, and to practise short written explanations. Our guide on how to practise CBSE competency-based questions walks through the habit in more detail.
Common Mistakes to Avoid
- Memorising equations without conditions. The right reagent with the wrong condition is often marked wrong.
- Skipping units in physical chemistry. A missing or wrong unit can cost a mark on every numerical.
- Learning name reactions in isolation. Without a conversion map, they fall apart under exam pressure.
- Ignoring NCERT examples. Board questions often reflect NCERT's own wording, examples and in-text questions.
- Not practising a full paper. Chemistry is easy to feel good about until you meet the clock. Our note on why the final pre-board simulation matters explains why a full dress rehearsal is worth it.
Expert Tips from BuzzyBrains Academy Faculty
Founder Dilip Sah (IIT Kanpur alumnus, JEE AIR 400, 25+ years of mentoring experience), who leads Chemistry in our crash course, keeps the advice short:
- Do organic on paper, not on screen. A conversion you have written five times is one you can write in the exam.
- Run a 20-minute numerical block every morning. Consistency beats intensity in physical chemistry.
- Keep one page of exceptions. Add to it after every mock and read it on the exam morning.
Our 12th CBSE PCMB Crash Course drills exactly these areas in weeks 3-5, then moves to board-pattern mocks in weeks 6-8. For the full eight-week structure, see our crash plan for Physics, Chemistry, Maths and Biology. To check whether the course is right for your child, talk to us; batch dates and seats are confirmed on the enrollment call.
