Sakshi Rajawat
Content Writer
JEE Main 2026 exam is very important for engineering aspirants. Chemistry often determines the final rank of a candidate. Many students find chemistry easier than Physics and Mathematics. This subject is highly scoring if concepts are clear. The JEE Main 2026 session 1 was conducted in January. Analysis shows that questions were mostly from NCERT textbooks. Direct formula-based questions appeared frequently in the paper. Aspirants now look toward the JEE Main session 2 exam in April. Success in this session requires a solid revision plan. A chemistry formula sheet for JEE Mains 2026 is essential for this.
This blog provides a detailed JEE Main 2026 session 2 chemistry revision notes guide. It covers physical, organic, and inorganic sections. Students can find these all important equations and trends in this blog.
For those aiming for IIT, securing a dependable JEE Mains Chemistry formulas 2026 PDF is essential. A PDF allows for quick access during travel breaks. It acts as a digital chemistry formula sheet for JEE Mains 2026. Students can use it to verify equations while solving practice papers.
The National Testing Agency (NTA) often follows the NCERT syllabus closely. Therefore, the formula sheet must go with the latest textbook editions. This blog provides all necessary mathematical relations and reaction patterns. It helps in maintaining high speed and accuracy during the computer-based test.
JEE Main Chemistry syllabus 2026 is divided into three main sections. These are Physical, Inorganic and Organic Chemistry. Understanding the weightage of each unit helps in prioritizing topics. Below is a detailed table showing the unit-wise distribution for the JEE Main 2026 Exam.
JEE Main 2026 Chemistry Unit-wise Syllabus and Weightage
| Section | Unit Name | Key Focus Areas | Approx. Weightage |
| Physical | Some Basic Concepts | Mole concept, stoichiometry | 3% |
| Physical | Atomic Structure | Quantum numbers, Bohr model | 6% |
| Physical | Chemical Bonding | VSEPR, Hybridization, MOT | 7% |
| Physical | Thermodynamics | Enthalpy, Entropy, Gibbs Energy | 8% |
| Physical | Solutions | Raoult’s law, Colligative properties | 6% |
| Physical | Equilibrium | Kc, Kp, pH, Solubility product | 7% |
| Physical | Redox & Electrochemistry | Nernst equation, Faraday's laws | 6% |
| Physical | Chemical Kinetics | Rate laws, Arrhenius equation | 5% |
| Inorganic | Periodic Table | Ionization energy, Trends | 4% |
| Inorganic | p-Block Elements | Group 13 to 18 properties | 7% |
| Inorganic | d and f Block | Transition elements, Magnetism | 6% |
| Inorganic | Coordination Compounds | Ligands, CFSE, Isomerism | 6% |
| Organic | GOC & Purification | IUPAC, Electronic effects | 5% |
| Organic | Hydrocarbons | Alkanes, Alkenes, Alkynes | 7% |
| Organic | Carbonyl Compounds | Aldehydes, Ketones, Acids | 9% |
| Organic | Organic Nitrogen | Amines, Diazonium salts | 5% |
| Organic | Biomolecules | Carbohydrates, Proteins | 3% |
A Chapter-wise Chemistry formula list for JEE 2026 ensures no topic is missed. Physical Chemistry involves many numerical problems. Students need to memorize specific constants and conversion factors.
Physical Chemistry requires a strong grip on mathematical applications. Most questions in the numerical section come from these chapters.
The mole concept is the foundation of all chemistry. Students must understand the relationship between mass and moles.
Formulas for Mole Concept and Atomic Structure
| Topic | Formula (Text Format) | Variables |
| Mole Calculation | n = w / M | w = given mass, M = molar mass |
| Molarity | M = n / V (in Liters) | n = moles of solute, V = volume |
| Energy of Electron | En = -13.6 * (Z^2 / n^2) eV | Z = atomic number, n = orbit |
| Radius of Orbit | rn = 0.529 * (n^2 / Z) Angstrom | n = orbit number, Z = atomic number |
| De Broglie Wavelength | lambda = h / (m * v) | h = Planck's constant, m = mass |
| Heisenberg Uncertainty | (delta x) * (delta p) >= h / (4 * pi) | delta x = uncertainty in position |
| Normality | N = M * n-factor | M = Molarity |
| Mass Percent | % w/w = (Mass of solute / Mass of solution) * 100 | Ratio of masses |
Thermodynamics deals with energy changes. Kinetics focuses on the speed of reactions. Both are high-weightage topics.
Thermodynamics and Chemical Kinetics Formulas
| Chapter / Law | Formula (Text Format) | Importance / Context |
| First Law | delta U = q + w | Conservation of energy principle |
| Enthalpy | delta H = delta U + (delta ng) * R * T | Relation between H and U for gases |
| Gibbs Energy | delta G = delta H - (T * delta S) | Predicts if a reaction is spontaneous |
| Entropy Change | delta S = q(rev) / T | Measures the degree of randomness |
| Arrhenius Eq. | k = A * e^(-Ea / R * T) | Shows temperature effect on rate |
| First Order Rate | k = (2.303 / t) * log([A]0 / [A]) | Calculates time or concentration |
| Half Life (1st) | t(1/2) = 0.693 / k | Time for 50% reaction completion |
| Rate Law | Rate = k * [A]^x * [B]^y | Shows dependence of rate on conc. |
Solutions often feature questions on colligative properties. Electrochemistry focuses on cell potential and electrolysis.
Formulas for Solutions and Electrochemistry
| Concept | Formula (Text Format) | Detail |
| Raoult's Law | Ps = (XA * P0A) + (XB * P0B) | Total vapor pressure of solution |
| Osmotic Pressure | pi = i * C * R * T | Colligative property (incl. i) |
| Boiling Point | delta Tb = i * Kb * m | Elevation in boiling point |
| Freezing Point | delta Tf = i * Kf * m | Depression in freezing point |
| Van't Hoff Factor | i = Normal Molar Mass / Observed | Corrects for ions/association |
| Nernst Equation | E = E0 - (0.059 / n) * log(Q) | Potential at 298 Kelvin |
| Faraday's Law | w = (E * I * t) / 96500 | Mass deposited during electrolysis |
| Cell Potential | E0(cell) = E0(cathode) - E0(anode) | Standard EMF calculation |
Organic Chemistry is less about formulas and more about reactions. Organic Chemistry Name Reactions 2026 includes several key mechanisms. Students often find it difficult to remember the reagents. Identifying the specific reagent is the key to solving these questions.
| Name Reaction | Reagents | Final Product |
| Wurtz Reaction | Na + Dry Ether | Higher Alkanes (Symmetrical) |
| Aldol Condensation | Dilute NaOH | Beta-hydroxy aldehyde/ketone |
| Cannizzaro | Conc. NaOH | Alcohol + Carboxylic acid salt |
| Reimer-Tiemann | CHCl3 + KOH | Salicylaldehyde |
| Hoffmann Bromamide | Br2 + KOH | Primary Amine (one less Carbon) |
| Gabriel Phthalimide | Phthalimide + KOH + R-X | Pure Primary aliphatic amines |
| Clemmensen Red. | Zn-Hg + Conc. HCl | Alkanes from Carbonyls |
| Friedel-Crafts | Anhydrous AlCl3 + R-Cl | Alkyl/Acyl Benzene |
Memory is vital for Organic Chemistry. One effective way is to create a reaction map. A reaction map connects different functional groups. For example, alcohol can be converted into an alkyl halide. That halide can then become an alkane.
Students should practice writing reactions every day. Seeing the visual flow helps in retention. Using the JEE Main 2026 Session 2 Chemistry Revision Notes can also simplify this process. These notes highlight the exceptions in reactions. Exceptions are often the target of JEE questions.
Inorganic Chemistry is often considered a memory-based section. However, understanding trends makes it easier. An Inorganic Chemistry Trends PDF lists properties across periods and groups.
| Property / Rule | Trend Across Period (L to R) | Trend Down Group (Top to B) |
| Atomic Radius | Decreases | Increases |
| Ionization Energy | Increases | Decreases |
| Electronegativity | Increases | Decreases |
| Electron Affinity | Generally Increases | Generally Decreases |
| Metallic Character | Decreases | Increases |
| Magnetic Moment | mu = sqrt[n * (n + 2)] BM | n = number of unpaired electrons |
| EAN Rule | EAN = Z - (Oxid. State) + 2*(Coord. No.) | Z = Atomic Number |
| CFSE (Octahedral) | delta O = -0.4 * n(t2g) + 0.6 * n(eg) | Crystal Field Stabilization Energy |
Coordination compounds are highly important. Students must master the Crystal Field Theory (CFT). Calculating the Crystal Field Stabilization Energy (CFSE) is a common numerical task. The effective atomic number (EAN) rule is also frequently tested.
This table compares all three branches. It helps students decide their study strategy. Each branch needs a different approach.
| Feature | Physical Chemistry | Organic Chemistry | Inorganic Chemistry |
| Nature of Questions | Numerical & Conceptual | Reaction Mechanisms | Fact-based & Trends |
| Main Resource | Practice Problems | Reaction Charts | NCERT Textbooks |
| Difficulty Level | Moderate to High | Moderate | Easy to Moderate |
| Memory Requirement | High (for formulas) | High (for reactions) | Very High (for facts) |
| Time per Question | 2-3 Minutes | 1-2 Minutes | 30-60 Seconds |
Many formulas appear often in the JEE Mains Chemistry Formulas 2026 PDF. These are high-yield equations for the exam. The JEE Main Chemistry weightage and formula sheet 2026 highlights these trends.
The relationship between Kp and Kc is very important for Equilibrium.
Kp = Kc * (RT)^(delta n)
In this formula, delta n is the change in gaseous moles. If delta n is zero, then Kp equals Kc. This logic saves time during the JEE Main 2026 Session 2 Chemistry Revision Notes.
Another key area is the Solutions chapter. The freezing point depression formula is common.
delta Tf = i * Kf * m
Here, 'i' represents the Van’t Hoff factor. Students often forget this factor in the Chemistry Formula Sheet for JEE Mains 2026. Always check if the solute dissociates or associates in the liquid.
| Chapter | Topic | Formula |
| Equilibrium | Kp and Kc | Kp = Kc * (RT)^(delta n) |
| Solutions | Boiling Point | delta Tb = i * Kb * m |
| Solid State | Density | d = (Z * M) / (a^3 * NA) |
| Atomic Structure | Photon Energy | E = h * c / lambda |
| Gas Laws | Ideal Gas | P * V = n * R * T |
Using these Most important formulas for JEE Mains Physical Chemistry ensures better accuracy. Memorizing these relations helps in solving numericals within seconds.
Revision of JEE Main Chemistry formulas is more than just reading. It is about active recall. Students should follow these steps for the best results.
Write a formula on one side. Write its name on the other. Test yourself while traveling or during breaks.
Apply the formulas to real questions. This builds confidence and speed. Do not just look at solved examples.
Spend 15 minutes every morning. Write down the Chapter-wise Chemistry formula list for JEE 2026. This strengthens muscle memory.
Discuss reactions with friends. Explaining a concept helps you learn it better. Discuss the Organic Chemistry Name Reactions 2026.
Mock tests simulate the real exam environment. They help in time management. Analyze your mistakes after every test.
Aspirants can find the formula sheet on various educational platforms. Official websites and coaching portals often provide free PDFs. Students should look for a Chemistry Formula Sheet for JEE Mains 2026 that is updated. It must include the latest syllabus changes made by the NTA.
Downloading the JEE Mains Chemistry Formulas 2026 PDF allows for offline study. It is better to have a printed copy. Writing notes on the margins of the sheet makes it personalized. These personalized notes are the best for the night before the exam.
Mastering Chemistry is about balancing three different worlds. Physical Chemistry requires mathematical accuracy. Organic Chemistry demands a logical mind for mechanisms. Inorganic Chemistry depends on a clear memory of facts.
Using the Most important formulas for JEE Mains Physical Chemistry can lead to a top score. The JEE Main Chemistry Formulas 2026 are the tools for success. Students should stick to NCERT as their primary source. Regular revision of the Chapter-wise Chemistry formula list for JEE 2026 will build confidence.
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