Class 12 Chemistry Formulas | CBSE Science Formula Guide 2026
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Class 12 Chemistry Formulas (CBSE) – Complete Science Formula Guide 2026
Chemistry in CBSE Class 12 is a formula-based and scoring subject if revised properly. Many students lose marks not because they don’t understand concepts, but because they forget formulas during exams.
This article covers all important Class 12 Chemistry formulas, chapter-wise, in a simple and easy-to-revise format, helping students score better in board exams and competitive tests.
Why Chemistry Formulas Are Important for Class 12 CBSE?
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Direct use in numerical questions
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Needed for MCQs and case-based questions
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Frequently tested in Electrochemistry, Solutions, Kinetics
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Useful for CUET, NEET, JEE basics
Board Tip: Writing the correct formula alone can fetch step marks.
Class 12 Chemistry – Formula-Based Chapters
| Unit | Chapter Name |
|---|---|
| Physical Chemistry | Solutions, Electrochemistry, Chemical Kinetics |
| Physical Chemistry | Surface Chemistry |
| Physical Chemistry | Solid State |
| Physical Chemistry | Thermodynamics |
| Organic Chemistry | Aldehydes, Ketones, Acids |
| Organic Chemistry | Amines |
| Inorganic Chemistry | Coordination Compounds |
Solutions – Important Formulas
| Topic | Formula |
|---|---|
| Molarity (M) | Moles of solute ÷ Volume of solution (L) |
| Molality (m) | Moles of solute ÷ Mass of solvent (kg) |
| Mole Fraction (X) | Moles of component ÷ Total moles |
| Raoult’s Law | P = X × P⁰ |
| Elevation in BP | ΔTᵦ = Kᵦ × m |
| Depression in FP | ΔT𝒇 = K𝒇 × m |
| Osmotic Pressure | π = CRT |
Electrochemistry – Important Formulas
| Topic | Formula |
|---|---|
| EMF of Cell | E°cell = E°cathode − E°anode |
| Nernst Equation | E = E° − (0.0591/n) log Q |
| Gibbs Energy | ΔG° = −nFE° |
| Conductance | G = 1/R |
| Molar Conductivity | Λm = κ × (1000/C) |
Chemical Kinetics – Important Formulas
| Topic | Formula |
|---|---|
| Rate Law | Rate = k[A]ⁿ |
| First Order Half-Life | t½ = 0.693 / k |
| Arrhenius Equation | k = A e^(−Ea/RT) |
Most Asked: First-order reaction numericals
Solid State – Important Formulas
| Topic | Formula |
|---|---|
| Density of Unit Cell | Density = (Z × M) / (a³ × Nₐ) |
| Packing Efficiency | (Volume of atoms ÷ Volume of unit cell) × 100 |
Surface Chemistry – Important Formula
| Topic | Formula |
|---|---|
| Freundlich Adsorption Isotherm | x/m = kP¹⁄ⁿ |
Thermodynamics – Important Formulas
| Topic | Formula |
|---|---|
| First Law | ΔU = q + w |
| Gibbs Free Energy | ΔG = ΔH − TΔS |
| Relation | ΔG° = −RT ln K |
Coordination Compounds – Key Formula
| Topic | Formula |
|---|---|
| Coordination Number | Number of ligands bonded to metal |
Mostly theory-based, fewer numericals
Organic Chemistry – Important Formula Concepts
| Topic | Key Point |
|---|---|
| Aldehydes & Ketones | Tollens’, Fehling’s tests |
| Carboxylic Acids | Acidity order |
| Amines | Basicity order |
| Diazonium Salts | Sandmeyer & Gattermann reactions |
Remember reaction reagents & conditions more than formulas.
Last-Minute Chemistry Formula Revision Tips
✔ Make one-page formula sheets
✔ Revise numerical chapters daily
✔ Practice NCERT examples
✔ Memorize units & constants
✔ Don’t skip derivations meaning
Click Here to Know More about Class 12 Chemistry Organic Reactions List – CBSE Important Reactions to Pass Easily Details: https://dekhocampus.com/news/class-12-chemistry-organic-reactions-list
FAQs (Frequently Asked Questions)
Solutions, Electrochemistry, Chemical Kinetics, Solid State.
Write formulas daily and solve numericals immediately after revision.
At least 10–15 numericals per formula-based chapter.
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