JEE Main 2024 January Session : Most Chemistry Questions JEE Main Exam Came From These Chapters

Chemistry, accounting for a third of all questions in the national-level engineering entrance exam, the Joint Entrance Examination (JEE) Main, is often considered the most scoring of the three papers. In the JEE Main, every mark bears huge importance.

Conducted by the National Testing Agency (NTA) for admission to some of the top engineering colleges in the country such as National Institutes of Technology (NIT) – the JEE Main is intensely competitive. The last one, NTA JEE Main 2024 January session, was qualified by just 5.5 per cent of the total number of candidates who wrote it. But with careful preparation and the right strategy, it is possible to score very well in the subject.

First, it is very useful to know what the JEE Main is like and then formulate the best suitable strategy. Questions from the previous year are a good way to assess the difficulty level of the JEE Mains. They can help in gaining a broader understanding of how important certain topics are from the perspective of the exam, and the difficulty level of the questions. Many of these topics are covered in Class 11 and Class 12 Chemistry NCERT textbooks.

Here’s an analysis of the JEE Main 2024 January session to help you prepare for the next exam.

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NTA JEE Main: Chemistry

The exam was held in 10 shifts and 300 questions from all those shifts were from Chemistry. Careers360 analysed all 300 questions and the tables below show how many questions came from each chapter in JEE Main 2024 January session.

JEE Main: Chemistry Questions

JEE Chemistry: Physics, Inorganic, Organic

The discipline of Chemistry is divided into Physics, Inorganic and Organic.

Given below is a list of concepts that are considered important from each of the three branches of Chemistry and the number of questions asked from each last year. Questions from these topics also tend to repeat.

JEE Main Syllabus: Physical Chemistry

JEE Main Syllabus: Inorganic Chemistry

JEE Main Syllabus: Organic Chemistry

Now let us understand these concepts one by one.

JEE Main 2024 January Session Question Paper:

Physical Chemistry

Physical Chemistry is more analytical in nature and involves numerical and the application of various concepts in solving questions. It is a highly-scoring component of Chemistry. Questions are of easy-to-moderate difficulty level. Below mentioned are some of the most important topics for the JEE-Main exams.

INTEGRATED RATE EQUATIONS

This is an important topic from the chapter “Chemical Kinetics” in Class 12 NCERT. Integrated rate equation is the most important topic for understanding the kinetics of chemical reactions. Integrated rate equation relates to the concentrations of reactants or products to time, and helps in analysing the rate of reaction and time taken. For JEE Main, it is important to understand how to use the Integrated rate equation in determining reaction orders, rate constants, and half-life values. Numericals are asked from this topic which are doable if sufficient practice is done before examination.

GALVANIC CELLS AND NERNST EQUATION

From the Nernst Equation, important aspects are:

Galvanic Cells: Structure and components of galvanic cells (anode, cathode, salt bridge), Numerical based on finding the electrode potentials (E°) to predict cell spontaneity.

Nernst Equation: Students must understand the derivation of the Nernst equation and its application application for non-standard conditions. Questions are also from calculating the cell potential (E) at different concentrations and temperatures.

Colligative Properties and Van't Hoff Factor

This topic belongs to the "Solutions" Chapter of NCERT class 12th. Students must focus on:

Colligative Properties: Understanding the concept of colligative properties which includes vapour pressure lowering, boiling point elevation, freezing point depression and how they depend on the concentration of solute (Molality). Numericals are asked from this topic which involves the different formulas for respective colligative proeties. (e.g., ΔT_b = K_b ✖ m).

Van't Hoff Factor: A strong understanding of the definition of the Van't Hoff factor (i) is required as to is used in many numerical. Van't Hoff factor (I) is defined as the ratio of moles of particles in solution to moles of solute dissolved. Application Van't Hoff factor to predict the extent of dissociation of electrolytes in solution and its impact on colligative properties like freezing point depression or osmotic pressure is an important area of understanding.

Inorganic Chemistry

Inorganic chemistry mainly deals with the behaviour of organometallic and inorganic compounds. It covers non-carbon chemical compounds. Below are some of the most important topics from this section.

BONDING IN COORDINATION COMPOUNDS

Coordination compounds are the most important and scoring chapter of Inorganic Chemistry. Students must focus on Coordination Chemistry basics which involves understanding the concepts of coordination numbers, ligands, metal-ligand bonding (including dative bonding), and coordination geometries (e.g., octahedral, tetrahedral). Molecular Orbital Theory (MOT) is an important topic from which many questions are asked. The study of MOT to comprehend bonding and electronic structure in coordination complexes is important.

SOME IMPORTANT COMPOUNDS OF HALOGENS

From this topic, students must focus on the chemical properties of Halogens and their various compounds. Reactions of important halogen compounds such as halogen acids (e.g., HCl, HBr), halogen oxides (e.g., Cl₂O, Br₂O), and interhalogen compounds (e.g., ClF₃, BrF₅) must be practised before the examination. Also, study of the molecular structures and bonding characteristics of these compounds to predict their physical and chemical properties is important.

Organic Chemistry

If understood well, Organic Chemistry can pay rich dividends. The crux of Organic Chemistry lies in understanding the basic principles discussed in the chapter “Organic Chemistry- Basic Principles and Techniques’’. All the concepts are interrelated and hence, holistic understanding is a must.

FUNDAMENTAL CONCEPTS IN ORGANIC REACTION MECHANISM

This is the fundament chapter for understanding complete organic chemistry. If this chapter is understood well with all the concepts, the rest of the organic chemistry chapters become easy. Students must be well versed in electron movement which involves the understanding of electron flow in organic reactions, including mechanisms such as nucleophilic substitution (SN1 and SN2), elimination (E1 and E2), addition, and rearrangement reactions. A strong understanding of fundamental concepts like electrophiles, nucleophiles, leaving groups, carbocation stability, and reaction intermediates (e.g., carbocations, carbanions, radicals) is needed to score well in the examination.

CHEMICAL PROPERTIES OF HALOALKANES AND HALOARENES

This chapter mainly includes understanding nucleophilic substitution reactions (SN1 and SN2) and elimination reactions (E1 and E2) that haloalkanes undergo. Along with this focus must be on understanding the reactivity of haloarenes towards nucleophilic aromatic substitution reactions (e.g., Finkelstein reaction, Sandmeyer reaction).

For a detailed explanation of important concepts of Chemistry, visit - JEE Main Exam's High Scoring Chapters and Topics and download the E-Book for their reference.