IIT JAM 2025 Question Paper with Solutions Available: Download PDF Here, Analysis

IIT JAM Question Papers 2025: Important Highlights

• This year, IIT Delhi is set to design the IIT JAM Question Paper for all the subjects.

• The IIT JAM examination is conducted for seven subjects, Physics, Chemistry, Biotechnology, Geology, Mathematics, Mathematical Statistics and Economics.

• There are no major changes in the examination pattern as compared to the IIT JAM 2024 examination.

• The candidates can appear for two IIT JAM Question Papers given that they pay the additional fee. However, this is the maximum number of attempts possible for the candidates.

• The IIT JAM Question Paper for all the subjects will be divided into three sections, A, B and C.

• The negative marking in the IIT JAM examination applies only to Section A. For each incorrect 1-mark question, 1/3 mark is deducted, and for each incorrect 2-mark question, 2/3 mark is deducted. Sections B and C, however, do not have any negative markings.

• The results will be declared tentatively on March 19 as per the latest notification released by IIT Delhi.

IIT JAM Question Paper with Solutions 2025: Chemistry

IIT JAM Chemistry memory based questions 2025 with solutions are mentioned below.

Q 1. Acidity order of aqua complexes having CN₆ of Al³⁺, Fe²⁺, and Fe³⁺?

Ans, The acidity of aqua Complexes depends on the charge density of $u$ Central metal ion. $\mathrm{Fe}^{3+}$ has highest charge density we to smallest ionic radius, making Complex most acidic.

$\mathrm{Fe}^{3 t}>\mathrm{Al}$ bt $>\mathrm{Fe}^{2 t}$ - acidic order.

Q 2. C₁₂O₁6 having frequency 3.8 has O₁₈. What is the new frequency?

Ans. $
\begin{aligned}
& v=\frac{1}{2 \pi} \sqrt{\frac{k}{\mu}} \text { or } \frac{v_2}{v_1}=\sqrt{\frac{\mu_1}{\mu_2}} \\
& \mu=\frac{m_1 m_2}{m_1+m_2}
\end{aligned}
$
For $c^{12}-0^{16}$

$
\mu=\frac{12 \times 16}{12+16}=\frac{192}{28}=6.85
$
For $C^{12}-0^{18} \quad A=\frac{12 \times 18}{12+18}=\frac{216}{30}=7.2$

$
\begin{aligned}
& \frac{v_2}{v_1}=\sqrt{\frac{6.0 .57}{7.2}} \\
& v_2=3.71
\end{aligned}
$

Q 3. A 1.84 g mixture of CaCO₃ reacts until weight loss. The residual weight is 0.96 g. What is the percentage composition of CaCO₃ in the mixture?

Ans. $\mathrm{CaCO}_3 \longrightarrow \mathrm{CaO}+\mathrm{CO}_2$

$\begin{aligned} n & =\frac{\text { Molar mass of } \mathrm{CaO}}{\text { Molar mass of } \mathrm{CaCO}_3} \\ & =\frac{56}{100}=0.56\end{aligned}$

$\begin{aligned} & \text { Amount of } \mathrm{CaCO}_3 \\ & \begin{aligned} \frac{\text { mass of }{ }^2 \mathrm{CO}}{n} & =\text { Amount } \\ \frac{0.96}{0.56} & =1.71 \mathrm{~g} \\ \% \text { of } \mathrm{CaCO}_3 & =\left(\frac{1.71}{1.84}\right) \times 100 \\ & =92.93 \%\end{aligned}\end{aligned}$

Q 4. If P₄O₁₀ is hydrolyzed and then heated above 300°C. What will be the product?

Ans. $\begin{aligned} & \text { Above } 300^{\circ} \mathrm{C} \text { give }\left(\mathrm{HPO}_3\right) \\ & \mathrm{P}_4 \mathrm{O}_1 \mathrm{O}+6 \mathrm{H}_2 \mathrm{O} \rightarrow 4 \mathrm{H}_3 \mathrm{PO}_4 \\ & 2 \mathrm{H}_3 \mathrm{PO}_4 \rightarrow \mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7+\mathrm{H}_2 \mathrm{O} \\ & \mathrm{H}_4 \mathrm{P}_2 \mathrm{O} \rightarrow 2 \mathrm{HPO}_3+\mathrm{H}_2 \mathrm{O}\end{aligned}$

Q 5. Write the acidity order for [fe(NH3)6]+2,[fe(NH3)6]+3,[Al (NH3)6]+3

Ans. The acidity of Coordination Complexes depends on the charge density of Central metal ion. A higher charge density and 8 maller ionic radius increase the polarisation of the ligand $\left(\mathrm{NH}_3\right)$.

$
\mathrm{Al}^{3+}>\mathrm{Fe}^{3+}>\mathrm{Fe}^{2 t}-\text { acidic order }
$

Q 6. Electron is Accelerated through 10 KV Potential, Then De-broglie wave length (lamba) =?

Ans. $\begin{aligned}
\lambda & =\frac{h}{\sqrt{2 m e V}} \\
2 m_e V & =2 \times\left(9.1 \times 10^{-31}\right) \times\left(1.602 \times 10^{-19}\right) \\
& =2.92 \times 10^{-2} 3 \mathrm{~J} / \mathrm{kg} \\
\text { Ine } \sqrt{2 m_e V} & =\sqrt{2.92 \times 10^{-23}} \\
& =5.41 \times 10^{-12} \\
\lambda & =\frac{6.626 \times 10^{-34}}{5.41 \times 10^{-12}} \\
& =0.125 \mathrm{~nm}
\end{aligned}$

Q 7. No. of stereoisomers?

Ans. There are 3 optical centre

No. of Sterioisomer is $2^n=2^3=8$

IIT JAM Question Paper Pattern 2025

The given below is the IIT JAM question paper pattern for all the subjects as prescribed by the IIT JAM examination conducting authority, IIT Delhi.

IIT JAM 2025 Question Paper

This section provides the complete IIT JAM 2025 question paper, allowing aspirants to review all questions, understand the exam pattern, and practice effectively for future attempts.

IIT JAM 2025 Answer Key

This section contains the official or memory-based answer key for IIT JAM 2025, helping candidates cross-check their responses, evaluate performance, and analyse solutions for better IIT JAM 2026 preparation.

IIT JAM 2026 Mock Tests

Candidates must participate in IIT JAM 2026 mock tests as part of their preparation. These mock tests play a crucial role in assessing one’s readiness and understanding the difficulty level of the exam. Below are links to the official IIT JAM mock tests, created by IIT Delhi, the exam’s conducting body. Candidates are strongly encouraged to practice these mock tests before appearing for the actual examination.

IIT JAM 2025 Question Paper with Solutions

This section provides the full IIT JAM 2025 question paper along with step-by-step solutions, helping aspirants understand the solving approach, learn problem-solving strategies, and practice effectively for future attempts like IIT JAM 2026.

IIT JAM 2026 Preparation Tips – How to Score High

This section provides essential IIT JAM 2026 preparation tips, helping aspirants plan effectively, strengthen conceptual understanding, and improve speed and accuracy to score high in the exam.

Understand the Exam Pattern and Syllabus

Start by thoroughly understanding the IIT JAM 2026 exam pattern, marking scheme, and subject-wise syllabus. Each subject includes MCQs, Multiple Select Questions (MSQs), and Numerical Answer Type (NAT) questions. Knowing the pattern helps in effective planning and focusing on high-weightage topics.

Create a Subject-Wise Study Plan

Divide your preparation across all subjects and chapters. Allocate more time to difficult or high-scoring topics while maintaining a balance between theory and numerical problem practice. A structured timetable ensures no topic is left untouched and reduces last-minute stress.

Strengthen Conceptual Clarity

Focus on understanding fundamental principles, derivations, and formulas rather than rote memorization. Use NCERT textbooks and standard reference books to build a strong foundation in Physics, Mathematics, Chemistry, Biotechnology, or Economics.

Practice Previous Years’ Question Papers

Solving past IIT JAM papers helps identify question trends, difficulty levels, and frequently tested topics. It improves problem-solving speed, builds confidence, and helps manage time effectively during the exam.

Take Regular Mock Tests

Full-length mock tests simulate the real IIT JAM environment. They enhance speed, accuracy, and exam confidence. Analyze mistakes after each test and revise weak areas to maximize scoring potential.

Focus on Numerical Answer Type (NAT) Questions

NAT questions carry significant marks and require precise calculation. Practice step-by-step numerical problems daily, memorize key formulas, and use shortcuts for faster and accurate solving.

Revise Important Topics Regularly

Revision is essential. Maintain concise notes, formula sheets, and topic summaries. Focus on high-yield chapters that are frequently tested and revise them multiple times before the exam.

Manage Time Effectively During Preparation

Time management is crucial during preparation and the exam. Solve questions within a time limit, prioritize easier questions first, and allocate remaining time to difficult problems. Avoid spending too long on a single question.