Complete Guide to NDA chemistry repeated topics from class 11 and 12 2026

The National Defence Academy (NDA) chemistry section relies heavily on foundational concepts from Class 11 and 12 NCERT textbooks. High-yield topics include Atomic Structure, Chemical Bonding, States of Matter, Redox Reactions, Periodic Table, Acids, Bases, Salts, and Carbon compounds. Mastering these ensures a consistent, high-scoring performance in the GAT paper.

What is the Exam?

The National Defence Academy (NDA) examination is a prestigious, gateway-level competitive exam conducted by the Union Public Service Commission (UPSC) for candidates aspiring to join the Army, Navy, and Air Force wings of the NDA and the Indian Naval Academy Course (INAC). It is not merely a test of academic knowledge but an assessment of a candidate's aptitude, physical fitness, and officer-like qualities (OLQs). The chemistry section forms a significant part of the General Ability Test (GAT), contributing directly to the total marks required to qualify for the Services Selection Board (SSB) interview.

Key Highlights 2026

For the 2026 academic cycle, the UPSC has maintained the standard rigor associated with the NDA. Chemistry, as part of the General Science component in Paper II (GAT), tests the candidate's understanding of basic chemical principles applicable in everyday life. We at Exam Bhai emphasize that the focus remains on conceptual clarity rather than rote memorization. The paper is designed to assess if candidates can apply scientific knowledge to analyze phenomena observed in military and general environments.

Syllabus 2026

The chemistry syllabus for NDA is derived directly from the Class 11 and 12 NCERT curriculum. Below is the breakdown of the most frequently asked topics:

Exam Pattern

The GAT paper consists of 150 questions, where Chemistry typically accounts for 15-20 questions, carrying 4 marks each.

Candidates looking to optimize their performance should practice free mock tests for Defence on Exam Bhai to get accustomed to the pressure of the GAT time limit. Understanding the weightage of each section is vital for time management during the exam.

Eligibility Criteria

Eligibility is strictly governed by the guidelines provided by the official UPSC portal.

• Nationality: Citizen of India, subject of Nepal, or a Tibetan refugee who came to India before Jan 1, 1962.
• Age: Must be between 16.5 and 19.5 years as of the commencement date of the course.
• Educational Qualification: For Army Wing, a 10+2 pass in any stream. For Air Force and Naval wings, 10+2 with Physics, Chemistry, and Mathematics is mandatory.

Application Process

The application process is conducted online via the UPSC portal. Candidates must register, fill out the OTR (One-Time Registration), and select their preferred exam center. Accurate documentation is essential, as any discrepancy during the verification stage can lead to disqualification.

Preparation Strategy

We at Exam Bhai recommend a strategy centered on NCERT textbooks.

1. Master the Basics: Start with the atomic structure (Protons, Neutrons, Electrons).
2. Repeated Patterns: UPSC frequently tests properties of elements, periodic table trends, and acid-base neutralization reactions.
3. Application-Based Learning: Focus on how chemical compounds are used in industry and defense (e.g., explosives, fuels, polymers).
4. Consistent Practice: To bridge the gap between theoretical knowledge and exam performance, you should access the latest mock test series for Defence to simulate real exam conditions.
5. Revision: Utilize flashcards for formulas and chemical symbols. Regularly review chemistry notes for NDA to ensure retention of high-yield topics.

Cut-Off Trends

Cut-off marks fluctuate based on the difficulty level of the paper and the number of vacancies. Historically, the aggregate cut-off for the written exam ranges between 340-360 out of 900. Official cut-off details are published annually on the UPSC official website after the final selection process is complete. We advise candidates to target at least 25% above the previous year's cut-off to ensure safety.

Frequently Asked Questions

Q1: How many questions are asked from Chemistry in NDA? Approximately 15 to 20 questions are asked in the GAT paper, making it a critical scoring area for non-science students.

Q2: Is NCERT enough for NDA Chemistry? Yes, for the conceptual basis, Class 11 and 12 NCERT books are sufficient. However, practicing past year papers is essential to understand the application-based nature of the questions.

Q3: Which topics are most repeated? Topics like Chemical Bonding, Acids and Bases, Physical and Chemical changes, and the properties of common elements like Carbon and Nitrogen appear almost every year.

Q4: Should I focus on Class 12 Organic Chemistry deeply? No, in-depth reaction mechanisms are rarely asked. Focus more on basic organic chemistry concepts, nomenclature, and the properties of common carbon compounds.

Q5: Can I skip Chemistry if I am strong in English and Geography? While possible, it is not recommended. Chemistry is a high-scoring section where questions are factual and can be solved quickly, saving time for more complex sections.

Q6: What is the best way to revise chemistry formulas? Create a dedicated formula sheet during your preparation and revise it weekly. Focus on oxidation states and valency, as these are foundational for many problems.