Top 10 Most Repeated Topics In Chemistry For JEE Mains 2026 - High Scoring Areas to Crack IIT JEE

Top 10 Most Repeated Topics In Chemistry For JEE Mains 2026 - High Scoring Areas to Crack IIT JEE

Upcoming Event

JEE Main Exam Date:21 Jan' 26 - 30 Jan' 26

Switch toEnglish IconHindi Icon
Shivani PooniaUpdated on 29 Oct 2025, 05:20 AM IST
Switch toEnglish IconHindi Icon

Top 10 Most Repeated Topics In Chemistry For JEE Mains - Chemistry is often seen as the most scoring section in JEE Main, as it requires less time to solve compared to Physics and Mathematics. With the right preparation, students can secure strong marks by focusing on the areas that carry the highest weightage. Over the years, certain chapters in Chemistry have been repeated more frequently in JEE Main, making them important for every aspirant to prioritize during their revision.

LiveJEE Main 2026 Registration LIVE: NTA JEE application dates soon; apply on jeemain.nta.nic.inOct 31, 2025 | 8:08 AM IST

JEE Mains 2026 will be conducted by the National Testing Agency (NTA), while as per media reports, IIT Roorkee will likely conduct JEE Advanced for admission to IITs.

IIT Roorkee to conduct JEE Advanced 2026. (Image source: Wikimedia Commons)

Read More

This Story also Contains

  1. Most Repeated Chemistry Topics For JEE Mains 2026
  2. Top 10 Most Important Chapters For JEE Mains Chemistry 2026
  3. Most Repeated Questions in JEE Mains Chemistry 2026
  4. Chemistry Study Plan for JEE Mains 2026
Top 10 Most Repeated Topics In Chemistry For JEE Mains 2026 - High Scoring Areas to Crack IIT JEE
Top 10 Most Repeated Topics In Chemistry For JEE Mains

The JEE Mains chemistry is known for being the most scoring subject so far. Hence, in this article we will help you prepare for chemistry by looking at the most repeated chemistry topics for JEE mains. Not only that, we will also be delving into top 10 most repeated topics in chemistry for JEE Mains to help you get exam ready. First, let's start with understanding the exam pattern and getting familiar with the details of JEE Mains 2026.

Download Ebooks PDFs:

Most Repeated Chemistry Topics For JEE Mains 2026

Preparing for any exam requires research and specially for a competitive entrance exam like JEE Mains requires thorough preparation. So, our experts have collected and done the thorough research from JEE Main Latest Syllabus 2026. In the below table we have provided you with the top 10 most repeated topics in chemistry for JEE Mains 2026. This data comprises last 10 years JEE mains question papers of all slots.

UPES B.Tech Admissions 2026

Ranked #43 among Engineering colleges in India by NIRF | Highest Package 1.3 CR , 100% Placements

Lovely Professional University B.Tech Admissions 2026

India's Largest University | NAAC A++ | 100% Placements Record | Highest CTC 2.5 Cr PA | 150 + Programmes across Multiple Disciplines

This table contains the most repeated chemistry topics for JEE Mains. For more details we have also provided you with a count of the total numbers of questions from these topics along with the chapters that they are from.

Chapter

Topic

Number of Questions

Some Basic Concepts of Chemistry

Concentration Terms

48

Some Basic Concepts of Chemistry

Mole Concept and Molar Mass

48

Some Basic Concepts of Chemistry

Stoichiometry, Stoichiometric Calculations and Limiting Reagent

39

Organic Compounds containing Oxygen

Reduction and Oxidation Reaction

37

Organic Chemistry – General Organic Chemistry + Hydrocarbons

Stereoisomerism

34

Biomolecules

Disaccharides and Polysaccharides

33

Chemical Kinetics

First Order Reaction

33

Redox Reactions/d-Block Elements

Oxidation State

32

As seen, the topic Concentration Terms happen to be the most important with the highest weighted topic. The 10th most important topic is Oxidation State, a part of both the chapters : d-Block Element/Redox Reactions. Following this list, we have more high weighted topics which could be a game changer for the JEE mains chemistry exam.

Now, after seeing the topics, let’s dive into the most important chapters for JEE mains chemistry 2026. Understanding this aspect will give you an upper hand in the preparation for the exam!

Top 10 Most Important Chapters For JEE Mains Chemistry 2026

We have already seen the most repeated chemistry topics for jee mains and the chapters that they are asked from. Now, let’s see which chapters have the highest number of questions from the past 10 years. Most important chapters for JEE mains Chemistry 2026 are curated by analyzing the frequency of the questions asked from the whole chapter in the last 10 years.

This table contains the chapter name on one side and the total number of questions asked from each chapter on the other side. These following listed chapters constitute the most important chapters for chemistry with organic compounds containing oxygen being the highest weighted chapter. This list has most important chapters ranked in order of most to least important.

Chapter

No. of Questions (Last 10 Years)

Organic Compounds containing Oxygen

259

P- Block Elements

216

Co-ordination Compounds

185

Hydrocarbons

188

Redox Reaction and Electrochemistry

173

Organic Compounds Containing Nitrogen

172

Chemical Thermodynamics

166

Atomic Structure

155

Chemical Bonding and Molecular Structure

151

Solutions

149

d - and f - BLOCK ELEMENTS

148

Some basic concepts in chemistry

142

Equilibrium

136

Some Basic Principles of Organic Chemistry

136

Chemical Kinetics

120

Refer to JEE Main Chapter-Wise Weightage for for a better understanding of important topics and helps you to prepare accordingly.

Most Repeated Questions in JEE Mains Chemistry 2026

In this section, we will be diving into each topic and looking at the set of most important questions from those particular topics listed above individually. Understanding the level of these questions and practicing them will help you increase your chances of scoring better and increasing your rank in JEE Mains exam 2026. Let’s dive in!

1. Concentration Terms

Question: Some amount of dichloromethane ( CH 2 Cl 2 ) is added to 671.141 mL of chloroform ( CHCl 3 ) to prepare 2.6 × 10 − 3 M solution of CH 2 Cl 2 ( DCM ) . The concentration of DCM is ppm (by mass).
Given : atomic mass : C = 12
H = 1 Cl = 35.5
density of CHCl 3 = 1.49 g cm − 3

Solution:

Molar mass = 12 + 2 + 71

= 85mmoles of DCM = 671.141 × 2.6 × 10 − 3

mass of solution = 1.49 × 671.141

PPM = 671.141 × 2.6 × 10 − 3 × 85 × 10 − 3 1.49 × 671.141 × 10 6

= 148.322 ..

Hence, the answer is (148.322).

Question: The molarity of 0.006 moles of NaCl in 100 ml solutions in -

(1) 0.6

(2) 0.06

(3) 0.006

(4) 0.066

Solution:

As we learn

Molarity -

Molarity = Moles of solute Vol.of solution ( L ) Molarity = Moles of solute Vol.of solution ( L ) M = n V ( l ) = 0.006 0.1 = 0.06

Hence, the answer is the option (2).

2. Mole Concept and Molar Mass

Question: 1 gram of a carbonate ( M 2 CO 3 ) on treatment with excess HCl produces 0.01186 mole of CO 2 .. The molar mass of M 2 CO 3 in g mol − 1 is :

(1) 118.6

(2) 11.86

(3) 1186

(4) 84.3

Solution:

Given,

Mass of carbonate ( M 2 CO 3 ) = 1 gram

As we have learned,

Number of Moles -

No of moles = given mass of substance/ molar mass of a substance

Given the Chemical reaction,

M 2 CO 3 + 2 HCl → 2 MCl + 2 H 2 O + CO 2

From the balanced equation

1 M = 0.01186 ⇒ M = 1 0.01186 = 84.3

Hence, the answer is an option (4).

3. Magnetic Moment (On the Basis of VBT)

Magnetic moment explains the magnetic behavior of coordination compounds using Valence Bond Theory (VBT). Questions are mostly conceptual and numerical, moderate in difficulty.

Question: The calculated magnetic moments (spin only value) for species [ FeCl 4 ] 2 − , [ Co ( C 2 O 4 ) 3 ] 3 − and MnO 4 2 − respectively are :

(1) 5.82, 0 and 0 B M

(2) 5.92 , 4.90 and 0 B M

(3) 4.90 , 0 and 1.73 B M

(4) 4.90 , 0 and 2.83 B M

Solution:

[ FeCl 4 ] 2 − Fe 2 + 3 d 6 → 4 unpaired electron

as Cl in a weak field liquid.

μ spin = 24 8 M = 4.9 BM

[ Co ( C 2 O 4 ) 3 ] 3 Co 3 + 3 d 6 → for Co 3 + with coodination no. 6

C 2 O 4 2 − is strong field ligand & causes pairing & hence no. unpaired electron.

μ spin = 0

[ MnO 4 ] 2 − Mn + 6 it has one unpaired electron.

μ spin = 3 BM = 1.73 BM

Hence,the answer is the option(3).

4. Stoichiometry, Stoichiometric Calculations and Limiting Reagent

Question: A sample of NaClO 3 is converted by heat to NaCl with a loss of 0.16 g of oxygen. The residue is dissolved in water and precipitated as AgCl. The mass of AgCl (in g) obtained will be:

(1) 0.35

(2) 0.41

(3) 0.48

(4) 0.54

Solution:

As we learnt in

Stoichiometry -

Stoichiometry deals with measurements of reactants and products in a chemical reaction.

- wherein

aA ( g ) + bB ( g ) → cC ( g ) + dD ( g )

Here, ‘a’ moles of A(g) reacts with ‘b’ moles of B(g) to give ‘c’ mole of C(g) and ‘d’ moles of D(g)

2 NaClO 3 → Δ 2 NaCl + 3 O 2 0.16 g

n NaCl 2 = n O 2 3

n NaCl = 0.16 32 × 2 3 = 1 200 × 2 3 = 1 300

NaCl → AgCl

PoAC on Cl

1 × n NaCl = 1 × n AgCl

1 300 = n A g C l

the weight of A g C l = 1 300 × [ 108 + 35.5 ] = 1 300 × 143.5 = 0.48 g

Hence, the answer is an option (3).

5. Applications of CFT (Crystal Field Theory)

CFT explains color, magnetism, and stability of coordination compounds. Questions are mostly conceptual and numerical, moderate in difficulty.

Question: Which of the following 3 d -metal ion will give the lowest enthalpy of hydration ( Δ hyd H ) when dissolved in water?

(1) Cr 2 +

(2) Mn 2 +

(3) Fe 2 +

(4) Co 2 +

Solution:

Water act as a weak ligand.C F S E of metal ions depend on strength of ligand.

Since the CFSE of Mn 2 + is the least, Δ H Hyd of it is also lowest.
Hence, the answer is the option (2).

6. Reduction and Oxidation Reaction

Redox reactions are key in electrochemistry and organic transformations. Questions are mostly numerical and moderate in difficulty.

Question: Experimentally reducing a functional group cannot be done by which one of the following reagents?

(1) Zn / H 2 O

(2) Pt − C / H 2

(3) Pd − C / H 2

(4) Na / H 2

Solution:

Out of the given reagents, Na / H 2 is not used as a reducing agent.

Hence, the answer is the option (4).

7. Stereoisomerism

Stereoisomerism explains spatial arrangement of atoms in molecules, important in organic chemistry. Questions are mostly conceptual and moderate in difficulty.

Question: The total number of possible isomers for square-planar [ Pt ( Cl ) ( NO 2 ) ( NO 3 ) ( SCN ) ] 2 − is :

(1) 8

(2) 12

(3) 16

(4) 24

Solution:

As we have learnt,

NO 2 − and S C N − are ambidentate ligands and each of them can attach through two different donor sites.

Now, the given square planar complex can show geometrical isomerism as well as linkage isomers.

The number of isomers possible is listed below:

CompoundNumber of Isomers
[ Pt ( Cl ) ( NO 2 ) ( NO 3 ) ( SCN ) ] 2 −3
[ Pt ( Cl ) ( ONO ) ( NO 3 ) ( SCN ) ] 2 −3
[ Pt ( Cl ) ( ONO ) ( NO 3 ) ( NCS ) ] 2 −3
[ Pt ( Cl ) ( NO 2 ) ( NO 3 ) ( NCS ) ] 2 −3
JEE Main 2026: Preparation Tips & Study Plan
Download the JEE Main 2026 Preparation Tips PDF to boost your exam strategy. Get expert insights on managing study material, focusing on key topics and high-weightage chapters.
Download EBook

Thus, the total number of Isomers is 12.

Hence, the answer is an option (2).

8. Disaccharides and Polysaccharides

This topic is important in biomolecules, especially for carbohydrates' structure and properties. Questions are mostly conceptual and numerical, moderate in difficulty.

Question: Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is :

(1) Amylose

(2) Sucrose

(3) Maltose

(4) Lactose

Solution:

As we have learned,
The monosaccharides are involved in the formation of the given sugars.
Amylose: α − D Glucose

Sucrose : α − D-Glucose + β − D-Fructose

Maltose : α - D-Glucose

Lactose : β - D-Galactose + β - D-Glucose

Hence, the answer is the option (4).

9. First Order Reaction

First-order reactions are important in chemical kinetics. Questions are mostly numerical and moderate in difficulty.

Question: For a first-order reaction, A → P , t 1 2 , (half-life) is 10 days. The time required for 1 4 th conversion of A (in days) is :

(ln 2=0.693, ln 3=1.1)

(1) 4.1

(2) 3.2

(3) 5

(4) 2.5

Solution:

For the first-order reaction: -

K = 0.693 t 1 2 = 0.693 10 K = 2.303 t log ⁡ R o R t 0.693 10 = 2.303 t log ⁡ R o × 4 3 R 0 0.693 10 = 2.303 t [ log ⁡ 4 − log ⁡ 3 ] = 2.303 t [ 0.6020 − 0.4771 ] 0.693 10 = 2.303 t × 0.1249 t = 2.303 × 0.1249 × 10 0.603 = 4.15 days

Hence, the correct answer is option (1)

10. Oxidation State

Question: The amphoteric oxide among V 2 O 3 , V 2 O 4 and V 2 O 5 upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is:

(1) +3

(2) +7

(3) +5

(4) +4

Solution:

V 2 O 3 - basic
V 2 O 4 - weakly acidic or amphoteric
V 2 O 5 - amphoteric

V 2 O 5 + alkali → VO 4 3 −
In VO 4 3 − ion, vanadium is in a +5 oxidation state.

Hence, the correct answer is option (3).

Students can follow JEE Main- Top 30 Most Repeated Questions & Topics for better practice and revision. Along with that try to solve JEE Main 2026 Sample Paper.

Chemistry Study Plan for JEE Mains 2026

Chemistry is divided into three branches Physical, Organic, and Inorganic Chemistry. And it is one of the most important and scoring subject if you are preparing for JEE Mains 2026. To study chemistry in a better way students must study each branch separately, focusing on its core concepts, formulas, and reaction mechanisms.

  • It is important to learn important reactions, formulas, and periodic table trends.

  • Read the NCERT textbook and solve exercises

  • Revise key topics frequently and solve full-length mock tests

  • Solve previous year questions

Cambridge Institute of Technology B.Tech Admissions 2025

Highest CTC 53.5 LPA | Average CTC 7.2 LPA | 200+ Companies | 790+ Multiple offers

Vishwa Vishwani BS Computer Science Admissions 2025

27 Years of Academic Excellence | State of Art Infrastructure

For complete preparation strategy follow JEE Main 2026 complete preparation strategy

JEE Main Syllabus: Subjects & Chapters
Select your preferred subject to view the chapters

Frequently Asked Questions (FAQs)

Q: Is NCERT enough for the preparation of JEE Mains 2026?
A:

Actually, no! JEE Mains is a national competitive exam and students should refer to a lot of other books as well for the in depth preparation of chemistry. So you must refer to 2-3 books outside NCERT as well!

Q: How should I prioritize Chemistry chapters for JEE Mains 2026?
A:

Start with high-weightage and repeated topics like Mole Concept, Thermodynamics, Coordination Compounds, Redox Reactions, and Hydrocarbons. Once strong in these, cover remaining chapters systematically to ensure no topic is left uncovered.

Q: Which Chemistry is easiest to score?
A:

Inorganic chemistry has the easiest syllabus and is the highest to score. It is advisable to not leave any topic of this part of chemistry if you’re planning to bag a good rank in the exam.

Q: Which are the most repeated topics for JEE Mains so far?
A:

The most repeated topics include Concentration Terms (Solutions), Mole Concept, Redox Reactions, Stoichiometry, Coordination Compounds, Chemical Kinetics, Chemical Bonding, and Oxidation States. These topics consistently appear in JEE Mains over the years.

Articles
|
Certifications By Top Providers
Basic Programming using Python
Via Indian Institute of Technology Bombay
Introduction to Aerospace Engineering
Via Indian Institute of Technology Bombay
Fundamental Concepts of Electricity
Via Indian Institute of Technology Bombay
Artificial Intelligence
Via Columbia University, New York
Computer Fundamentals
Via Devi Ahilya Vishwavidyalaya, Indore
B.Sc in Programming and Data Science
Via Indian Institute of Technology Madras
Udemy
 1525 courses
Swayam
 817 courses
NPTEL
 773 courses
Coursera
 697 courses
Edx
 608 courses
Explore Top Universities Across Globe

Questions related to JEE Main

On Question asked by student community

Have a question related to JEE Main ?

Hello,

From the below website you can download the previous year question papers of JEE Mains Hindi medium.

https://engineering.careers360.com/hi/articles/jee-main-question-paper

It consists of last 10 years question paper, solving them all will surely help you in preparation.

All the best.

Hello,

Visit the below website to know the high weightage chapters for JEE 2026.

https://engineering.careers360.com/articles/jee-main-chapter-wise-weightage

You'll also get to know which books should be referred for your preparation.



Hello,

From the below website you can get to know which are the important topics, chapter wise weightage and also which books to refer to prepare for JEE Mains 2026.

https://engineering.careers360.com/articles/jee-main-chapter-wise-weightage


Hello,

Visit the below website to know the important chapters for JEE 2026.

https://engineering.careers360.com/articles/jee-main-chapter-wise-weightage

You'll also get to know the weightage of chapters and which books to refer for your preparation.


Hello,

Yes, knowing the chapter wise weightage plays an important role in preparation of JEE.

Visit the below website to know it.

https://engineering.careers360.com/articles/jee-main-chapter-wise-weightage

Also refer the books that are recommended there as they'll help you in preparing well for your examination.

All the best.