Class 12 Chemistry Notes

~5 min read

Class 12 Chemistry Notes

One place for all your Class 12 Chemistry revision. Chapter-wise notes covering the solid state, solutions, electrochemistry, chemical kinetics, organic and inorganic chemistry — each with key formulas, exam pointers, and solved JEE/NEET examples, written for CBSE boards and national exams.

Class:12Subject:ChemistryCovers:CBSE · JEE · NEET

5 Key Formulas25 Practice MCQs

DWritten byDeep Narayan

UpdatedSeptember 2026

Key Concept Summary

What is covered in Class 12 Chemistry?

Class 12 Chemistry has three main branches: physical chemistry (solid state, solutions, electrochemistry, chemical kinetics), organic chemistry (haloalkanes, alcohols, aldehydes, carboxylic acids, amines), and inorganic chemistry (p-block, d-block, f-block and coordination compounds).

About the Class 12 Chemistry Notes

These chapter-wise notes condense the entire Class 12 chemistry syllabus (both CBSE and most state boards, aligned with the JEE Main and NEET syllabi) into quick-revision sheets. Each chapter page gives you the essential concepts, the key formulas in one place, exam pointers that save time in the exam hall, and a quick FAQ that answers the most-asked questions.

How to use these notes

Use each chapter page for last-minute revision: read the quick answer, scan the key formulas, then test yourself with the exam pointers. The numeric formula lists also double as a formula sheet right before the exam.

Physical Chemistry Chapters

Solid State — unit cells, packing efficiency, voids (Schottky and Frenkel defects), and density.
Solutions — concentration terms, Raoult's law, colligative properties and the van't Hoff factor.
Electrochemistry — Nernst equation, conductance, and electrolysis.
Chemical Kinetics — rate laws, order of reaction, and the Arrhenius equation.

Formula-heavy chapters

Solid State, Solutions and Electrochemistry together carry the bulk of the numerical questions in JEE and NEET. Master the density, colligative and Nernst equation formulas first.

Organic Chemistry Chapters

Haloalkanes and Haloarenes — substitution reactions and named reactions.
Alcohols, Phenols and Ethers — acidity and the Lucas test.
Aldehydes and Ketones — nucleophilic addition and tests.
Carboxylic Acids and Amines — acidity, basicity, and named reactions.

Aldehyde test to remember

Tollens’ test: R-CHO \to R-COO^{-} + Ag (silver mirror)

Inorganic Chemistry Chapters

p-Block Elements — groups 15 to 18 and their key properties.
d- and f-Block Elements — transition metals, lanthanides and actinides.
Coordination Compounds — nomenclature, bonding, crystal field theory and isomerism.

Fact-heavy chapters

Inorganic chemistry is information-dense. The chapter pages pull out the high-yield facts — like the spectrochemical series and why Sc and Zn are not typical transition elements.

Quick Revision

Key formulas at a glance

Memorise these equations — direct application numericals and derivations in CBSE & JEE frequently hinge on these.

Density of a unit cell

ρ = \frac{Z M}{N _{A} a ^{3}}

Relative lowering of v.p.

\frac{p ^{\circ} - p}{p ^{\circ}} = x_{solute}

Depression of F.P.

Δ T_{f} = K_{f} m

Osmotic pressure

π = C R T

Nernst equation

E = E^{\circ} - \frac{0.059}{n} lo g Q

Exam Strategy

How this chapter is asked

High-yield question patterns observed across CBSE boards, JEE Main & Advanced, and NEET.

Solid State: density = ZM/(N_A a³); fcc has 74% packing.
Solutions: molality is temperature-independent; colligative properties depend on particle number.
Electrochemistry: use the Nernst equation at 298 K with 0.059 V.
Organic: Tollens' test (silver mirror) identifies aldehydes.
Inorganic: strong-field ligands form low-spin complexes.

FAQ

Frequently asked questions

How many chapters are there in Class 12 Chemistry?

Under the CBSE curriculum there are about 10 chapters, split across physical, organic and inorganic chemistry. This hub links each chapter's dedicated revision notes.

Which Class 12 chemistry chapter carries the most marks?

Solutions, Electrochemistry and Chemical Kinetics (physical), plus Organic chemistry overall, typically command the largest weight in board exams and are heavily tested in JEE and NEET.

Can I use these notes for JEE and NEET preparation?

Yes. Each chapter page aligns with the Class 12 syllabus common to CBSE, JEE Main/Advanced and NEET, and highlights pre-exam pointers plus graspable formula summaries.

How should I revise Class 12 chemistry?

Start with the physical chemistry formulas, then drill organic named reactions and original mechanisms, and finish with inorganic facts. Use each chapter's key-formulas section as a quick revision sheet.

Next Chapters

Continue learning

Solid State Notes Solutions Notes Organic Chemistry Notes Inorganic Chemistry Notes Electrochemistry Notes Chemical Kinetics Notes Class 12 Chemistry Notes in Hindi Chemistry Tutor in Mohali

Interactive Quiz

Chapter MCQ practice test

Instant scoring with complete solutions — test your mastery in under 15 minutes.

Active Recall Practice

Chapter MCQ Mock Test

Evaluate how well you have retained the concepts, formulas, and reaction mechanisms from this chapter. Questions adhere strictly to latest CBSE, JEE & NEET trends.

15 questions (of 25)~23 minutesInstant Score & Solutions

Master this chapter with expert live guidance

Self-study notes lay the ground, but conceptual doubts clear fastest in an interactive classroom. Narayan Gurukul Academy (ClassApna) conducts small-batch CBSE, JEE & NEET coaching with daily doubt solving and rigorous mock tests.

Book a Free Demo Class Explore Plans & Batches

Small batches · 1-on-1 personal mentorship · Live online & offline centre