JEE Main 2025 Chemistry Important Question - PDF Download

eSaral offers various study materials related to JEE Main Chemistry important questions prepared by our teachers and experts in their field. These teachers come from renowned institutions like IITs, and NITs. They have vast experience in the subject which helps you to achieve your goal easily. Chemistry important question Solution PDFs are available in various formats like MCQs and Integer questions. Students can analyze their problem-solving skills at different levels and work on them accordingly. Chemistry's important questions and solutions come with step-wise explanations which help in grasping and retaining the concepts easily. You will be guided through the correct presentation of answers and techniques to analyze the questions and solve them in the given time frame. These important questions include previous year's questions so that you can excel easily in the JEE Main 2025 exams.

Chapter-wise Important Questions for Chemistry

Important Formulas Covered in JEE Main

How to Learn JEE Main and Advanced Chemistry Formulas

Understand the Syllabus:  Properly go through the syllabus and organize the study plan accordingly. Identified different topics and sub-topics. Put your efforts accordingly.

Categorize the formula: Classify the formulas in different heads like Physical Chemistry, Organic Chemistry, and Inorganic Chemistry. So that you can focus on a specific category at a time and don’t confuse in between.

Use a Formula Sheet: Make a copy for formulas only so can go through it without any hassle at final exam time. Make important short notes with the formulas with the variables, units, and any special conditions and exceptions that come with them. Keep it as a handbook for quick reference.

Visualise Molecular Structures: In Chemistry you understand the structures and shapes and molecules they are the essential parts and Chemistry moves around bonds, structures, shapes, molecules, chemical equations, hybridization, and molecular geometries. This helps you grasp the concepts easily.

Practice Numerical Problems:  Chemistry demands solving numerical problems related to formulas. You should solve various numerical questions and apply the formula. This will improve your problem-solving skills and you will be able to strengthen the skills to apply formulas in practical concepts.

Understand the Concepts: You should not only learn the formula but should also understand its derivation reasoning and connections between various factors. Understand the theories, laws, and chemical principles that derive the formula.

Use Mnemonics and Memory Techniques: Learning the formulas with mnemonics and memory techniques helps you remember them easily. You can also use visual aids and images to recall them easily.

Solve Previous Years' Question Papers: Solving previous year's question papers is important for you to understand the exam pattern and type of questions that come in exam.

Seek Clarification: Clear your doubts from teachers, classmates, or from online platforms. Make sure your concepts are clear no doubts should remain at the time of the exam.

Important Formulas Covered in JEE Main

Atomic Structure is a fundamental topic in JEE Main and Advanced Chemistry, and it covers concepts such as electronic configuration, ionization energy, and electron affinity. The following are some of the essential formulas related to Atomic Structure:

• ${E = \dfrac{{ - 13.6}}{{{n^2}}}}$: This formula relates the energy of an electron in a hydrogen atom, where 'n' is the principal quantum number.

• ${\lambda  = \dfrac{h}{p}}$: This formula relates the wavelength of a particle to its momentum, where '${\lambda }$' is the wavelength, 'h' is Planck's constant, and 'p' is the momentum.

• ${E = \dfrac{{hc}}{\lambda }}$: This formula relates the energy of a photon to its wavelength, where 'E' is the energy, 'h' sign denotes Planck's constant; 'c' will be known as the speed of light, and '${\lambda }$' will donte the wavelength.

To learn these formulas, you should first understand the concept behind them and identify the relevant variables. You can use flashcards, mnemonic devices, or practice problems to help memorize them. Applying these formulas involves identifying the variables and using the appropriate units for each.

Chemical Bonding Formulas:

Chemical Bonding is another important topic in JEE Chemistry, and it covers concepts such as ionic and covalent bonding, Lewis structures, and molecular geometry. The following are some of the essential formulas related to Chemical Bonding:

• ${\Delta {\rm{H}}}$ = E(bonds broken) - E(bonds formed): This equation relates the enthalpy change of a response to the energy expected to break bonds and the energy delivered when new bonds are shaped.

• VSEPR Theory: This theory predicts the shape of molecules based on the repulsion between electron pairs around the central atom.

• Lewis Structure: This diagram shows the arrangement of electrons in a molecule or ion.

To learn these formulas, you should first understand the concept behind them and practice drawing Lewis structures and predicting the shape of molecules using VSEPR theory. Applying these formulas involves using the enthalpy formula to calculate the enthalpy change of a reaction and using Lewis structures to predict the reactivity of a molecule.

Electrochemistry Formulas:

Electrochemistry is an important topic in JEE Chemistry, and it covers concepts such as oxidation-reduction reactions, galvanic cells, and electrolysis. The following are some of the essential formulas related to Electrochemistry:

• $E{^ \circ }$cell = $E{^ \circ }$(cathode) - $E{^ \circ }$(anode): This formula relates the standard cell potential to the reduction potential of the cathode and the oxidation potential of the anode.

• Nernst equation: This equation relates the cell potential to the concentrations of the reactants and products and the standard potential.

• Faraday's laws: These laws relate the amount of substance produced or consumed during electrolysis to the amount of charge passed through the electrolyte.

Download and Learn from State of Matter Formula PDF

In JEE mains chemistry we have some formulas for the state of matter some of them are as follows:

• Ideal Gas Law:

The ideal gas law is a fundamental equation in thermodynamics, which describes the behavior of an ideal gas. The equation is as follows:

${PV = nRT}$

Where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature.

• Boyle's Law:

At a constant temperature, Boyle's law states that the volume of a gas is inversely proportional to its pressure. The equation is as follows:

${P_1V_1 = P_2V_2}$

Where, $P_1$ and $V_1$ symbols denote the initial pressure and volume, and $P_2$ and $V_2$ are the final pressure and volume.

• Charles's Law:

According to Charles's law, the volume of a gas at a constant pressure is directly proportional to its absolute temperature. The equation is as follows:

${\dfrac{{V_1}}{{T_1}} = \dfrac{{V_2}}{{T_2}}}$

Where, $V_1$ and $T_1$ are the initial volume and temperature, and $V_2$ and $T_2$ are the final volume and temperature.

• Gay-Lussac's Law:

Gay-Lussac's regulation expresses that the strain of a gas straightforwardly corresponds to its outright temperature at a steady volume. The equation is as follows:

${\dfrac{{P_1}}{{T_1}} = \dfrac{{P_2}}{{T_2}}}$

Where, $P_1$ and $T_1$ are the initial pressure and temperature, and $P_2$ and $T_2$ are the final pressure and temperature.

• Avogadro's Law:

At a constant temperature and pressure, according to Avogadro's law, the volume of a gas is directly proportional to the number of moles. The equation is as follows:

${\dfrac{{V_1}}{{n_1}} = \dfrac{{V_2}}{{n_2}}}$

Where, $V_1$ and $n_1$ are the initial volume and number of moles, and $V_2$ and $n_2$ are the final volume and number of moles.

• Dalton's Law of Partial Pressures:

Dalton's Law of Incomplete Tensions expresses that the complete strain of a combination of gases is equivalent to the amount of the fractional tensions of each gas. The equation is as follows:

$P \text{ total }= P_1 + P_2 + P_3 + ... + P_n$

Where P total is the total pressure, and $P_1, P_2, P_3, ..., P_n$ are the partial pressures of each gas.

• Graham's Law of Diffusion:

According to Graham's Law of Diffusion, a gas's rate of diffusion is inversely proportional to its molecular weight. The equation is as follows:

${\dfrac{{{\rm{\text{Rate}_1}}}}{{{\rm{\text{Rate}_2}}}} = \dfrac{{\sqrt{M_2} }}{{\sqrt{M_1} }}}$

Where ${\text{Rate}_1}$ and ${\text{Rate}_2}$ are the rates of diffusion of gases 1 and 2, respectively, and $M_1$ and $M_2$ are their molecular weights.

• Van der Waals Equation:

The Van der Waals Equation is a state equation for real gases that takes into account gases' non-ideal behavior. The equation is as follows:

${\left( {P + a{{\left( {\dfrac{n}{V}} \right)}^2}} \right)\left( {V - nb} \right) = nRT}$

Where P denotes the pressure, V denotes the volume, n is the number of moles, R denotes the universal gas constant, T will be the temperature, a is the Van der Waals constant for the gas, and b is the volume excluded by one mole of the gas.

Important Topics Covered in JEE Main 

Students can Practice Other Study materials with the JEE Main Chemistry Important Questions.

Practicing JEE Main Chemistry important questions is a vital part of preparation for students aiming to crack the exam. However, it’s important to remember that focusing only on these questions might limit your knowledge. Chemistry is a vast subject, and the JEE Main exam often tests students on a wide range of topics, requiring an in-depth understanding of various concepts. To enhance your preparation, it is advisable to practice other study materials alongside JEE Main Chemistry important questions.

Why Practice Other Study Materials?

Broader Coverage of Topics: JEE Main Chemistry questions may not cover every possible topic in detail. By practicing other study materials such as NCERT textbooks, reference books, and previous year's question papers, you expose yourself to different types of questions and topics that might not be covered in the list of important questions.

Better Conceptual Understanding: Chemistry has three main sections – Physical Chemistry, Organic Chemistry, and Inorganic Chemistry. Important questions are usually focused on topics that are frequently asked in the exams, but they might not give you a deep conceptual understanding of all three sections. Additional study materials help you dive deeper into the fundamental concepts, making it easier to solve complex problems during the actual exam.

Improved Problem-Solving Skills: JEE Main exams often have tricky and challenging questions that test your problem-solving ability. Other study materials, such as mock tests, practice papers, and question banks, provide a variety of questions with different difficulty levels. Regular practice of these materials will improve your speed, accuracy, and ability to tackle challenging problems.

Exposure to New Question Patterns: The JEE Main exam pattern can sometimes change. Relying only on important questions might limit your exposure to new types of questions. By practicing other materials, especially those from updated sources, you will be better prepared for any surprises in the exam.

Enhanced Time Management: JEE Main is a time-bound exam and managing time effectively is crucial to performing well. Practicing questions from a variety of sources will train you to quickly identify the best approach to solve different types of problems, helping you manage your time better during the exam.

What Other Study Materials Should You Use?

NCERT Textbooks: These are the foundation of the JEE Main syllabus. Ensure you thoroughly study the NCERT Chemistry books for classes 11 and 12. Every concept explained in these books is important for the exam.

Previous Year Question Papers: Solving the previous year’s JEE Main papers will help you understand the exam pattern, the types of questions asked, and the level of difficulty. This is crucial for effective exam preparation.

Reference Books: Books such as O.P. Tandon for Physical Chemistry, Morrison and Boyd for Organic Chemistry, and J.D. Lee for Inorganic Chemistry are excellent resources for deeper understanding and additional practice.

Mock Tests and Sample Papers: These simulate the actual exam environment and are an excellent way to test your readiness. They also help you get comfortable with the exam format, boost your confidence, and improve your time management skills.

Online Study Platforms: Many online platforms offer practice tests, quizzes, and video lectures that cover the entire JEE Main syllabus. These resources are useful for quick revisions and filling any gaps in your understanding.

How Useful Are Important Questions for the JEE Main Exam?

1. Focused Preparation

One of the biggest advantages of important questions is that they allow you to focus on the key topics frequently asked in the JEE Main exam. The syllabus for JEE Main is vast, and it can be overwhelming to prepare every topic in detail. Important questions help you zero in on high-weightage topics that are likely to appear in the exam. This targeted preparation can be beneficial, especially when you're short on time and need to cover the most relevant material.

2. Boosts Confidence

When students practice important questions regularly, they gain confidence in their ability to tackle common question types. These questions are typically drawn from previous years’ papers and cover essential concepts. As you solve more of these important questions, you get a clearer understanding of the kinds of problems that might appear in the exam. This familiarity can reduce anxiety and help you approach the exam with more self-assurance.

3. Saves Time

The JEE Main exam is time-bound, so it's essential to solve questions quickly and accurately. Important questions are useful in helping you develop strategies for solving problems efficiently. By practicing these questions, you can identify quicker methods or shortcuts for solving them, which will help you save time during the actual exam. Knowing which topics are more likely to come up means you can spend less time worrying about less important material and focus on mastering the key areas.

4. Reinforces Key Concepts

The important questions are generally based on fundamental concepts that are central to the JEE Main syllabus. Solving these questions repeatedly reinforces your understanding of these core concepts, making them easier to recall during the exam. This reinforcement is particularly helpful in subjects like Mathematics and Physics, where applying formulas and solving equations quickly is essential. Similarly, in Chemistry, important questions help in memorizing reactions and applying principles.

5. Acts as a Revision Tool

Important questions can be a great tool for revising what you’ve already studied. After going through the full syllabus, solving these questions can act as a quick revision method to refresh your memory on important topics. This is especially useful in the final weeks leading up to the exam when you need to revise large volumes of material in a short period. By focusing on these questions, you can ensure that you haven’t missed any crucial topics.