JEE Main Chemistry Formulas 2026: Complete Sheet, Revision Notes

JEE Main Chemistry Formulas 2026 are important for last-minute revision, especially now that Session 2 started on April 2. The Session 2 will continue till April 8, 2026. Chemistry remains one of the most scoring sections in the exam, and based on the Session 1 (January 2026) analysis, most questions were directly derived from NCERT.

A formula-focused revision strategy can significantly improve performance, particularly in Physical and Inorganic Chemistry, while Organic Chemistry requires clarity in reactions and mechanisms.

This JEE Main Chemistry Formula Sheet 2026 includes key equations from Physical Chemistry, important concepts from Inorganic Chemistry, and essential reactions from Organic Chemistry, helping candidates revise quickly and strengthen core concepts during the ongoing exam phase.

JEE Main 2026 Session 1 Chemistry Questions Overview

Based on shift-wise student feedback from JEE Main 2026 Session 1:

• Overall, Chemistry in JEE Main 2026 has been largely NCERT-based and scoring, with a strong emphasis on Organic and Inorganic Chemistry.
• Most papers ranged from easy to moderate difficulty, featuring direct theory and statement-based questions. 
• Physical Chemistry involved limited but sometimes calculation-heavy numericals. The section remained syllabus-aligned and concept-focused.

JEE Main Chemistry Formula Sheet 2026

A JEE Main Chemistry Formula Sheet is a compact collection of all important equations, constants, reactions, and rules required for quick revision. Ideally, this sheet should be revised multiple times in the last 30–45 days before the exam. Below, we break it down topic-wise for better understanding.

Physical Chemistry Formulas JEE Main

Physical Chemistry is highly scoring if formulas are well memorised and applied correctly. Questions are usually numerical and straightforward.

Some Important Physical Chemistry Formulas:

Mole Concept

• Number of moles = Given mass / Molar mass
  
  

• Molarity (M) = Moles of solute / Volume of solution (in litres)
  
  

• Molality (m) = Moles of solute / Mass of solvent (in kg)
  
  

• Mole fraction (χ) = Moles of component / Total moles
  
  

Atomic Structure

• Energy of electron:
  Eₙ = −13.6 / n² (in eV)
  
  

• Radius of orbit:
  rₙ = 0.529 × n² / Z (in Å)
  
  

• de Broglie wavelength:
  λ = h / mv
  
  

Thermodynamics

• First law: ΔU = q + w
  
  

• Enthalpy change: ΔH = ΔU + ΔnRT
  
  

• Gibbs free energy: ΔG = ΔH − TΔS
  
  

• Relation with equilibrium constant:
  ΔG° = −RT ln K
  
  

Chemical Kinetics

• Rate law: Rate = k[A]ⁿ
  
  

• First order reaction:
  k = (2.303 / t) log (a / a − x)
  
  

• Half-life (first order):
  t₁/₂ = 0.693 / k
  
  

Electrochemistry

• Nernst equation:
  E = E° − (0.0591 / n) log Q
  
  

• Faraday’s law:
  m = (Q × M) / (nF)
  
  

Solutions

• Raoult’s law: P = X × P°
  
  

• Osmotic pressure: π = CRT
  
  

• Van’t Hoff factor: i = Observed colligative property / Calculated value
  
  

Mastering these physical chemistry formulas, JEE Main can easily fetch 12–15 questions in the exam.

JEE Main Chemistry Revision Notes

Good JEE Main chemistry revision notes should be concise, clear, and formula-focused. Instead of re-reading textbooks, revision notes help in last-minute consolidation.

Smart Revision Tips:

• Revise Physical Chemistry formulas daily
  
  

• Make flashcards for Inorganic Chemistry
  
  

• Write Organic reactions repeatedly
  
  

• Revise mistakes from mock tests
  
  

High-Weightage Chapters for Revision:

• Mole Concept
  
  

• Thermodynamics
  
  

• Electrochemistry
  
  

• Coordination Compounds
  
  

• Chemical Bonding
  
  

• Hydrocarbons
  
  

• Carbonyl Compounds
  
  

A 20–30 minute daily revision using notes can dramatically improve accuracy.

Organic Chemistry Reactions JEE Main

Organic Chemistry scares many students, but reaction-based learning makes it manageable. In JEE Main, most Organic questions are direct reaction or reagent-based.

Key Organic Chemistry Reactions to Remember:

Hydrocarbons

• Alkane → Halogenation (Free radical substitution)
  
  

• Alkene → Addition reactions (H₂, HX, X₂)
  
  

• Alkene ozonolysis → Carbonyl compounds
  
  

Alcohols, Phenols & Ethers

• Alcohol → Alkene (Dehydration)
  
  

• Alcohol → Aldehyde/Ketone (Oxidation)
  
  

• Phenol → Kolbe reaction
  
  

• Williamson ether synthesis
  
  

Aldehydes & Ketones

• Tollens’ test (Aldehydes)
  
  

• Fehling’s test
  
  

• Aldol condensation
  
  

• Cannizzaro reaction
  
  

Carboxylic Acids & Derivatives

• HVZ reaction
  
  

• Esterification
  
  

• Decarboxylation
  
  

Amines

• Hofmann bromamide reaction
  
  

• Gabriel phthalimide synthesis
  
  

• Diazotisation reactions
  
  

Practising organic chemistry reactions, JEE Main ensures quick identification of products in MCQs.

Inorganic Chemistry Formulas JEE Main

Inorganic Chemistry is mostly memory-based and scoring. NCERT is the key source.

Important Inorganic Chemistry Formulas & Concepts:

Chemical Bonding

• Bond order = (Bonding electrons − Antibonding electrons) / 2
  
  

• Formal charge = Valence − Lone pair − (Bond pair / 2)
  
  

Coordination Compounds

• Oxidation number calculation
  
  

• Coordination number
  
  

• EAN = Atomic number − Oxidation state + Electrons donated
  
  

Periodic Properties

• Effective nuclear charge
  
  

• Ionisation energy trends
  
  

• Electronegativity order
  
  

Metallurgy

• Concentration methods
  
  

• Reduction reactions
  
  

• Ellingham diagram trends
  
  

d & f Block

• Magnetic moment:
  μ = √n(n + 2) BM
  
  

• Colour and oxidation states
  
  

Strong command over inorganic chemistry formulas JEE Main can fetch 8–10 direct questions.

How to Use This Formula Guide for JEE Main 2026?

Use this formula guide for daily revision by studying one section at a time. Practise applying formulas through numericals and PYQs. Revise regularly and track weak areas. Check below for a smart, time-efficient revision strategy.

• Revise Physical Chemistry formulas every morning
  
  

• Read Inorganic Chemistry at night (memory works better)
  
  

• Practise Organic reactions with mechanisms
  
  

• Solve previous year questions after each revision
  
  

• Maintain one handwritten formula notebook
  
  

Consistency matters more than volume.

Common Mistakes to Avoid

Avoid memorising formulas without understanding concepts. Do not skip NCERT lines in Inorganic Chemistry or regular revision. Ignoring mock test analysis and not revising Organic reactions repeatedly can lead to avoidable mistakes. Check below for key errors to avoid.

• Ignoring NCERT lines in Inorganic Chemistry

• Memorising formulas without understanding

• Skipping revision of solved numericals

• Not revising Organic reagents repeatedly

Avoiding these mistakes can significantly improve your Chemistry score.

Also check: PW JEE Mock Test Series 2026