By SenaPrep Defence Team Updated July 2026 12 min read
Cracking the UPSC National Defence Academy (NDA) written examination requires a highly focused preparation timeline. In this comprehensive study guide, our defence education experts analyze the core concepts of NDA chemistry guide, score 60 chemistry GAT, chemical formulas list, outline high-yield preparation tips, and provide step-by-step examples.
Part 1: Understanding Complete NDA Chemistry Study Guide & Notes
The written examination conducted by the Union Public Service Commission (UPSC) is highly competitive. Every year, over 3 lakh candidates compete for less than 400 vacancies. To secure your name in the final recommendation list, you must clear the sectional cutoffs and score highly in both Papers.
Syllabus Breakdown & Marks Allocation
Subject Segment
Total Questions
Weightage (Marks)
Preparation Priority
Paper 1: Mathematics
120 Questions
300 Marks
Critical (Sectional Cutoff)
Paper 2: GAT (English)
50 Questions
200 Marks
High Yield (4 Marks/Q)
Paper 2: GAT (General Knowledge)
100 Questions
400 Marks
High Scoring (Science & GS)
Part 2: Key Revision Strategies for NDA chemistry guide, score 60 chemistry GAT, chemical formulas list
Success in this topic requires consistent daily practice. Here are the core routines recommended by top defence educators:
Build Foundational Concepts: Rely on Class 11 and 12 NCERT books for math/science topics, and read standard grammar texts for English.
Solve Previous Year Papers (PYQs): Go through at least the last 5-10 years of UPSC question sets to analyze repeat question structures.
Speed & Time Management: Practice mock tests with a timer to improve your answering speed. You have only 75 seconds per math question in the real exam.
Track Weak Areas: Bookmark difficult problems and review your mistake history to continuously raise your score.
Part 3: Practical Questions & Solved Examples
Below is a preview of the type of questions asked by the UPSC. Test your current understanding of NDA chemistry guide, score 60 chemistry GAT, chemical formulas list and review the step-by-step methods:
Use the interactive test panel below to solve live questions pulled directly from the SenaPrep exam bank.
Interactive Practice Quiz
Test your preparation live! Choose an option for each question to see instant feedback and deep step-by-step explanations.
Question 1 of 5 Live App Practice
Which one of the following statements is not correct?
Detailed Solution:
Correct Answer
✓ Option A is correct. Carbon compounds are generally poor conductors of electricity.
📖 Governing Law / Core Concept
Covalent bonding in carbon compounds occurs through electron sharing, resulting in a variety of organic materials.
🧪 Step-by-Step Breakdown
Carbon's ability to form numerous covalent compounds is a defining feature of its chemistry. The majority of carbon compounds, including hydrocarbons (like alkanes), do not dissociate into ions in solution. This results in poor electrical conductivity:
Hydrocarbons: For example, ethane \(C_2H_6\) does not conduct electricity.
Covalent Bonds: Most carbon compounds exhibit non-polar or weak polar characteristics.
🔍 Option Analysis
Option B: Bonding in organic compounds is indeed covalent, consisting of shared electrons.
Option C: Graphite, a form of carbon, is utilized as a lubricant due to its layered structure, allowing sheets to slide.
Option D: Diamond is a well-known allotrope of carbon, characterized by its tetrahedral crystal lattice structure.
⚡ Mnemonic / Speed-Run
Mnemonic for Carbon Allotropes: "Graphite Glides, Diamonds Shine" – reminding that graphite is slippery while diamond is hard.
6. Visual Suggestion
6. Visual Suggestion
A comparison diagram illustrating the properties of diamond (hardness, non-conductive) versus graphite (lubricity, electrical conductivity).
📖 Factual Verification & Reference
📖 Factual Verification & Reference:
Verified against NCERT Class XI Chemistry, Chapter 4 (Carbon and its Compounds).
Question 2 of 5 Live App Practice
Which one of the following acid isused by goldsmith for cleaning of gold and silver articles ?
Detailed Solution:
Explanation: HNO₃ is used for cleaning of Gold and Silver Ornaments.
Question 3 of 5 Live App Practice
Which one of the following metals does NOT react with cold water to liberate hydrogen gas ?
Detailed Solution:
Question 4 of 5 Live App Practice
What is the specific purpose of using potassium hydroxide during the saponification process ?
Detailed Solution:
Correct Answer
✓ Option B is correct. Potassium hydroxide is used to produce softer soaps.
📖 Core Concept
During the saponification reaction, potassium hydroxide (KOH) acts as a strong base that hydrolyzes fats and oils, leading to the formation of soft soaps.
This yields a potassium soap, which is softer compared to sodium soap obtained using NaOH. Observations include a viscous mixture indicating soft soap formation.
🔍 Option Analysis
Option A: Incorrect, KOH yields soft soaps; NaOH is preferred for hard soaps.
Option C: Incorrect, KOH does not provide fragrance; it only catalyzes the reaction.
Option D: Incorrect, while KOH is economical, its primary role is in soap softness and quality.
⚡ Mnemonic / Speed-Run
Remember: KOH = Soft Soaps. NaOH = Hard Soaps.
📖 Factual Verification & Reference
📖 Factual Verification & Reference:
Verified against NCERT Class XII Chemistry, Chapter on Soap and Detergents.
Question 5 of 5 Live App Practice
Which one of the following was the first mineral acid discovered ?
Detailed Solution:
Correct Answer
✓ Option (a) is correct. Sulphuric acid is the first mineral acid discovered.
📖 Governing Law / Core Concept
The discovery of sulphuric acid dates back to the 8th century when the Persian alchemist Jabir ibn Hayyan first synthesized it in the form of oil of vitriol (H₂SO₄).
🧪 Step-by-Step Breakdown
Sulphuric acid, a dibasic strong acid, can be produced through the contact process:
\[
\text{SO}_2 + \text{O}_2 \xrightarrow{\text{V}_2\text{O}_5} \text{SO}_3
\]
\[
\text{SO}_3 + \text{H}_2\text{O} \rightarrow \text{H}_2\text{SO}_4
\]
Observations during its synthesis include a colorless liquid with a high boiling point and viscous properties.
🔍 Option Analysis
- **Hydrochloric acid (HCl)**: Historically utilized but not earlier than sulphuric.
- **Nitric acid (HNO₃)**: Discovered later, used for the production of fertilizers and explosives.
- **Phosphoric acid (H₃PO₄)**: Synthesized after sulphuric and plays a role in the agricultural sector.
⚡ Mnemonic / Speed-Run
Remember "SSH" - Sulphur is Strongly Historic for sulphuric acid being the first mineral acid.
6. Visual Suggestion
6. Visual Suggestion
A flowchart illustrating the industrial synthesis of sulphuric acid using the contact process, including states of reactants and products.
📖 Factual Verification & Reference
📖 Factual Verification & Reference:
Verified against NCERT Class 11 Chemistry, Chapter on Acids, Bases, and Salts.
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