JEE Main Chemistry Formulas 2025

Atomic Structure is a fundamental topic in JEE Main and Advanced Chemistry, and it covers concepts such as electronic configuration, ionisation 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 denote the 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 memorise 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.

Formulas for Some Important Laws

• 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 is straightforwardly corresponding 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 behaviour.. The equation is as follows:

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

Where P denote the pressure, V denoted the volume, n is the number of moles, R denoted 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.

How to Learn JEE Main and Advanced Chemistry Formulas

• Understand the Syllabus: Familiarise yourself with the JEE mains Chemistry syllabus to identify the different topics and subtopics that you need to cover. This will help you organise your study plan and prioritise your efforts.

• Categorise the Formulas: Divide the formulas into different categories such as Physical Chemistry, Inorganic Chemistry, and Organic Chemistry. This will help you focus on one category at a time and prevent confusion between different topics.

• Use a Formula Sheet: Create a personalised formula sheet or notebook where you can compile all the important formulas. Include the formulas along with their variables, units, and any special conditions or exceptions. Keep this sheet handy for quick reference and regular revision.

• Visualise Molecular Structures: Chemistry involves understanding the structures and shapes of molecules. Use models or online resources to visualise and understand molecular structures, including bond angles, hybridisation, and molecular geometries. This will help you grasp concepts related to organic and inorganic chemistry more effectively.

• Practice Numerical Problems:Chemistry often requires solving numerical problems to apply the formulas. Regularly practice solving a variety of numerical problems related to each formula you learn. This will enhance your problem-solving skills and strengthen your understanding of the formulas in practical contexts.

• Understand the Concepts: Don't just memorise the formulas; strive to understand the underlying concepts and principles. Science is a subject that requires sensible reasoning and a profound comprehension of the connections between various factors. Familiarise yourself with the theories, laws, and chemical principles that form the basis of the formulas.

• Refer to Reliable Study Materials: Utilise textbooks, reference books, and study guides specifically designed for JEE mains Chemistry. These resources often provide explanations, examples, and practice problems related to the formulas. Choose reliable and reputable sources that cover the JEE mains syllabus comprehensively.

• Solve Previous Years' Question Papers: Find out about the kinds of inquiries posed to in earlier years' JEE mains tests. Put these question papers to the test to see how the formulas are used and how well-prepared you are. You'll also learn how to manage your time better and become more familiar with the exam format from this.

• Seek Clarification: Ask your teachers, classmates, or online resources for clarification if you have any doubts or questions about the formulas. Engage in discussions, attend doubt-solving sessions, or join study groups to enhance your understanding and clear any misconceptions.

Conclusion 

JEE Main and Advanced Chemistry formulas are critical to scoring well in the exams, and understanding them is equally crucial. Aspirants should not only memorise the formulas but also focus on the concepts behind them. Understanding the concepts behind the formulas will help aspirants apply them correctly in numerical problems and ensure better comprehension of the subject.

To understand JEE Main and Advanced Chemistry formulas, aspirants should start by studying the fundamental concepts of each topic. Once they have a good understanding of the basics, they can move on to the formulas related to that topic. It is essential to note that each formula has a specific purpose, and aspirants should know when to use them.

JEE Main Subject-wise Important Formulas

Start your JEE Main journey with confidence, equipped with our Subject-wise important formulas that encompass the crucial concepts from Physics, Chemistry, and Mathematics. The table below will prove to be an invaluable asset in your JEE Main preparation.

Important Study Materials Links for JEE Exams 2025

JEE Exams 2025, having the right study materials is crucial for success. The JEE Main and Advanced exams require a strong grasp of Physics, Chemistry, and Mathematics, as well as thorough practice with exam-style questions.

Access to quality resources, including sample papers, practice tests, and detailed notes, helps students review key topics and practice effectively.