Explore: All NDA topics · NDA General Knowledge PYQs · NDA hub · Syllabus & pattern · NDA 2026
Answer first
Chemistry PYQs (previous year questions) for NDA: Chemistry (General Knowledge) had 322 questions across the 42 official NDA papers we tagged (2016–2026), and appeared in 21 of them. Asked in 11 of 11 years. The concepts asked in the most papers: Atomic Structure, Chemical Reactions, Acids and Bases.
Year-wise question count
Asked in 11 of 11 years.
| Year | Papers | Questions | Per paper |
|---|---|---|---|
| NDA 2026 | 2 | 30 | 15 |
| NDA 2025 | 2 | 31 | 15.5 |
| NDA 2024 | 2 | 30 | 15 |
| NDA 2023 | 2 | 33 | 16.5 |
| NDA 2022 | 2 | 29 | 14.5 |
| NDA 2021 | 2 | 30 | 15 |
| NDA 2020 | 1 | 17 | 17 |
| NDA 2019 | 2 | 28 | 14 |
| NDA 2018 | 2 | 30 | 15 |
| NDA 2017 | 2 | 29 | 14.5 |
| NDA 2016 | 2 | 35 | 17.5 |
Most-asked concepts
Sorted by the number of papers a concept appeared in.
| Concept | Questions | Papers | Years |
|---|---|---|---|
| Atomic Structure | 26 | 15 | 2026, 2025, 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016 |
| Chemical Reactions | 23 | 14 | 2026, 2025, 2024, 2023, 2022, 2021, 2019, 2018, 2017, 2016 |
| Acids and Bases | 19 | 11 | 2024, 2023, 2022, 2020, 2019, 2018, 2017, 2016 |
| Allotropes of Carbon | 13 | 10 | 2025, 2024, 2022, 2021, 2020, 2019, 2018, 2017 |
| Common Compounds | 20 | 8 | 2025, 2024, 2018, 2017, 2016 |
| Chemistry in Daily Life | 13 | 7 | 2024, 2018, 2017, 2016 |
| Chemical Bonding | 9 | 6 | 2026, 2024, 2022, 2021, 2020, 2016 |
| Mole Concept | 8 | 6 | 2026, 2025, 2024, 2018, 2017, 2016 |
| Physical and Chemical Changes | 7 | 6 | 2025, 2023, 2022, 2017, 2016 |
| Separation Techniques | 7 | 6 | 2024, 2023, 2022, 2021, 2017 |
| States of Matter | 8 | 5 | 2024, 2022, 2019, 2017, 2016 |
| Valency | 7 | 5 | 2024, 2022, 2018, 2017, 2016 |
| Metals | 6 | 5 | 2023, 2022, 2021, 2019 |
| Properties of Water | 5 | 5 | 2024, 2018, 2017 |
| Industrial Chemistry | 9 | 4 | 2026, 2023, 2021 |
| Acids Bases and Salts | 8 | 4 | 2026, 2021 |
| Organic Chemistry | 8 | 4 | 2023, 2022, 2017, 2016 |
| Metals and Non-Metals | 7 | 4 | 2018, 2017, 2016 |
| Mixtures and Solutions | 6 | 4 | 2026, 2025, 2022 |
| Oxidation and Reduction | 6 | 4 | 2026, 2025 |
| Fuels | 5 | 4 | 2025, 2020, 2019 |
| Soaps and Detergents | 5 | 4 | 2025, 2021, 2019 |
| Hydrogen | 4 | 4 | 2026, 2022, 2021, 2019 |
| Periodic Table | 4 | 4 | 2025, 2021, 2020 |
| Alloys | 4 | 3 | 2023, 2022, 2021 |
| Colloids | 3 | 3 | 2023, 2021, 2016 |
| Corrosion | 3 | 3 | 2023, 2022, 2019 |
| Gas Laws | 3 | 3 | 2023, 2018, 2017 |
| Mixtures | 3 | 3 | 2019, 2018 |
| Compounds | 7 | 2 | 2020, 2019 |
| Chemistry in Everyday Life | 5 | 2 | 2025, 2023 |
| Carbon and its Compounds | 3 | 2 | 2026 |
| Allotropes | 2 | 2 | 2023 |
| Carbon Compounds | 2 | 2 | 2023, 2022 |
| Cement | 2 | 2 | 2025, 2019 |
| Chemical Formulae | 2 | 2 | 2022, 2021 |
| Elements | 2 | 2 | 2024, 2019 |
| Environmental Chemistry | 2 | 2 | 2017, 2016 |
| Fertilizers | 2 | 2 | 2024, 2022 |
| Laws of Chemical Combination | 2 | 2 | 2026, 2018 |
| Metallurgy | 2 | 2 | 2023, 2021 |
| Salts | 2 | 2 | 2023, 2022 |
| Water | 2 | 2 | 2025, 2019 |
| Chemical Compounds | 3 | 1 | 2021 |
| Inorganic Compounds | 2 | 1 | 2026 |
| Noble Gases | 2 | 1 | 2017 |
| Oxides | 2 | 1 | 2025 |
| Acid Rain | 1 | 1 | 2025 |
| Acids Bases and pH | 1 | 1 | 2025 |
| Atomicity | 1 | 1 | 2025 |
| Electrolysis | 1 | 1 | 2021 |
| Electrolytes | 1 | 1 | 2022 |
| Elements and Compounds | 1 | 1 | 2025 |
| Equivalent Weight | 1 | 1 | 2019 |
| Gases | 1 | 1 | 2022 |
| Glass | 1 | 1 | 2019 |
| Hardness of Water | 1 | 1 | 2025 |
| History of Chemistry | 1 | 1 | 2025 |
| Hydrocarbons | 1 | 1 | 2023 |
| Industrial Gases | 1 | 1 | 2024 |
| Isotopes | 1 | 1 | 2021 |
| Nuclear Fuel | 1 | 1 | 2019 |
| Organic Compounds | 1 | 1 | 2024 |
| Organic Reactions | 1 | 1 | 2021 |
| Oxidation Number | 1 | 1 | 2019 |
| Oxidation State | 1 | 1 | 2024 |
| Paints | 1 | 1 | 2019 |
| Periodic Properties | 1 | 1 | 2023 |
| Petroleum | 1 | 1 | 2016 |
| Pigments | 1 | 1 | 2022 |
| Radioactivity | 1 | 1 | 2020 |
| Reactivity Series | 1 | 1 | 2019 |
| Redox Reactions | 1 | 1 | 2019 |
| Solutions | 1 | 1 | 2017 |
How to practise Chemistry PYQs
- Start with the concepts at the top of the table. They have come back the most.
- Solve one year’s Chemistry questions from the official PDF against the clock, then check the answer listed below.
- Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
- Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.
Questions by year
Each line gives the question number and paper, type, concept, our one-line summary and the official answer, with a link to the official PDF.
NDA2026
- Q.76 (NDA (I) GAT) · MCQ · Atomic Structure: Electrons and nucleons in a given ion PDF
- Q.77 (NDA (I) GAT) · MCQ · Carbon and its Compounds: Most thermodynamically stable form of carbon PDF
- Q.78 (NDA (I) GAT) · MCQ · Mixtures and Solutions: Statements on colloids, suspensions and Tyndall effect PDF
- Q.79 (NDA (I) GAT) · MCQ · Mixtures and Solutions: Separating a non-volatile solute from a solution PDF
- Q.80 (NDA (I) GAT) · MCQ · Oxidation and Reduction: Everyday processes that are oxidation PDF
- Q.81 (NDA (I) GAT) · MCQ · Acids Bases and Salts: Concept behind the H⁺/OH⁻ definition of acids and bases PDF
- Q.82 (NDA (I) GAT) · MCQ · Industrial Chemistry: Reaction that gives superphosphate of lime PDF
- Q.83 (NDA (I) GAT) · MCQ · Laws of Chemical Combination: Law shown by silver nitrate and sodium chloride masses PDF
- Q.84 (NDA (I) GAT) · MCQ · Industrial Chemistry: Statements on the fertilizer Nitrolim PDF
- Q.85 (NDA (I) GAT) · MCQ · Industrial Chemistry: Paint components matched with examples PDF
- Q.86 (NDA (I) GAT) · MCQ · Industrial Chemistry: Statements on additives in emulsion paints PDF
- Q.87 (NDA (I) GAT) · MCQ · Acids Bases and Salts: Count of Lewis acids in a list PDF
- Q.88 (NDA (I) GAT) · MCQ · Carbon and its Compounds: Statements on soaps, catenation and carbon oxides PDF
- Q.89 (NDA (I) GAT) · MCQ · Industrial Chemistry: Physical tests used in paper manufacture PDF
- Q.90 (NDA (I) GAT) · MCQ · Oxidation and Reduction: Reactions matched with oxidant/reductant properties PDF
- Q.76 (NDA (II) GAT) · MCQ · Oxidation and Reduction: Statements on oxidation numbers PDF
- Q.77 (NDA (II) GAT) · MCQ · Hydrogen: Statements on hydrogen, tritium and water PDF
- Q.78 (NDA (II) GAT) · MCQ · Chemical Bonding: Statements on nitrogen molecule PDF
- Q.79 (NDA (II) GAT) · MCQ · Acids Bases and Salts: Colour of phenolphthalein after acid-base mixing PDF
- Q.80 (NDA (II) GAT) · MCQ · Acids Bases and Salts: Zinc reactions and natural acids PDF
- Q.81 (NDA (II) GAT) · MCQ · Mixtures and Solutions: Statements on tincture of iodine, suspensions, colloids PDF
- Q.82 (NDA (II) GAT) · MCQ · Inorganic Compounds: Hydrogen peroxide strength and copper sulphate hydrate PDF
- Q.83 (NDA (II) GAT) · MCQ · Inorganic Compounds: Nettle sting, Plaster of Paris and copper sulphate PDF
- Q.84 (NDA (II) GAT) · MCQ · Chemical Reactions: Reactions matched with reaction types PDF
- Q.85 (NDA (II) GAT) · MCQ · Mole Concept: Mass percentages of N and H in a compound PDF
- Q.86 (NDA (II) GAT) · MCQ · Carbon and its Compounds: Products of hydrolysis of coconut oil with KOH PDF
- Q.87 (NDA (II) GAT) · MCQ · Chemical Bonding: Statements on hydrogen bonds PDF
- Q.88 (NDA (II) GAT) · MCQ · Chemical Bonding: Reason ionic compounds have high melting points PDF
- Q.89 (NDA (II) GAT) · MCQ · Industrial Chemistry: Setting of Portland cement and role of gypsum PDF
- Q.90 (NDA (II) GAT) · MCQ · Mixtures and Solutions: Colloid examples matched with types PDF
NDA2025
- Q.71 (NDA (I) GAT) · MCQ · Soaps and Detergents: Incorrect statement about soaps, detergents and micelles PDF
- Q.72 (NDA (I) GAT) · MCQ · Atomic Structure: Correct statement about neutron, electron mass and isotopes PDF
- Q.73 (NDA (I) GAT) · MCQ · Atomic Structure: Nuclear particle discovered by Chadwick PDF
- Q.74 (NDA (I) GAT) · MCQ · Atomic Structure: Finding not part of Rutherford's nuclear model PDF
- Q.75 (NDA (I) GAT) · MCQ · Periodic Table: Group of an element forming a high-melting chloride XCl2 PDF
- Q.76 (NDA (I) GAT) · MCQ · Oxides: Identify the neutral oxide PDF
- Q.77 (NDA (I) GAT) · MCQ · Common Compounds: Compound known as dry ice PDF
- Q.78 (NDA (I) GAT) · MCQ · Acids Bases and pH: Incorrect statement about the pH scale PDF
- Q.79 (NDA (I) GAT) · MCQ · Mole Concept: Incorrect statement on moles, volumes and molecules at STP PDF
- Q.80 (NDA (I) GAT) · MCQ · Elements and Compounds: Incorrect statement about the nature of a compound PDF
- Q.81 (NDA (I) GAT) · Matching · Common Compounds: Match common chemical names with formulae PDF
- Q.82 (NDA (I) GAT) · MCQ · Oxides: Nitrogen oxide that can dimerize PDF
- Q.83 (NDA (I) GAT) · MCQ · Oxidation and Reduction: Incorrect statement on oxidation and reduction by H and O transfer PDF
- Q.85 (NDA (I) GAT) · MCQ · Acid Rain: pH threshold below which rain is acid rain PDF
- Q.109 (NDA (I) GAT) · MCQ · Oxidation and Reduction: What happens to fats and oils left out for long PDF
- Q.143 (NDA (I) GAT) · MCQ · History of Chemistry: Element known to have been discovered earliest PDF
- Q.96 (NDA (II) GAT) · MCQ · Chemical Reactions: Reaction when CO2 is passed through lime water PDF
- Q.97 (NDA (II) GAT) · MCQ · Common Compounds: Incorrect statement on crystallisation water, Plaster of Paris and washing soda PDF
- Q.98 (NDA (II) GAT) · MCQ · Chemistry in Everyday Life: Type of medicine used to treat indigestion PDF
- Q.99 (NDA (II) GAT) · MCQ · Cement: Compound not present in cement PDF
- Q.100 (NDA (II) GAT) · MCQ · Physical and Chemical Changes: Which is not a chemical change PDF
- Q.101 (NDA (II) GAT) · MCQ · Physical and Chemical Changes: Incorrect statement on physical and chemical changes PDF
- Q.102 (NDA (II) GAT) · MCQ · Mixtures and Solutions: Which is not a heterogeneous mixture PDF
- Q.103 (NDA (II) GAT) · Matching · Atomicity: Match elements with their atomicity PDF
- Q.104 (NDA (II) GAT) · MCQ · Oxidation and Reduction: Reducing agent in the hydrazine-peroxide reaction PDF
- Q.105 (NDA (II) GAT) · MCQ · Water: Purest natural source of water PDF
- Q.106 (NDA (II) GAT) · MCQ · Hardness of Water: Salt responsible for temporary hardness of water PDF
- Q.107 (NDA (II) GAT) · Matching · Chemical Reactions: Match reactions with their types PDF
- Q.108 (NDA (II) GAT) · MCQ · Chemical Reactions: Identify the endothermic reaction PDF
- Q.109 (NDA (II) GAT) · MCQ · Fuels: Composition of water gas PDF
- Q.110 (NDA (II) GAT) · MCQ · Allotropes of Carbon: Incorrect statement on diamond, graphite and fullerene PDF
NDA2024
- Q.64 (NDA (I) GAT) · MCQ · Atomic Structure: Abundance of boron isotopes from average atomic mass PDF
- Q.65 (NDA (I) GAT) · MCQ · Chemistry in Daily Life: Essential constituents of Portland cement PDF
- Q.66 (NDA (I) GAT) · MCQ · Acids and Bases: Natural source from which litmus indicator is derived PDF
- Q.67 (NDA (I) GAT) · MCQ · Oxidation State: Oxidation state of vanadium in V2O5 PDF
- Q.68 (NDA (I) GAT) · MCQ · Allotropes of Carbon: Match carbon allotropes with their properties PDF
- Q.98 (NDA (I) GAT) · MCQ · Industrial Gases: Composition of water gas PDF
- Q.100 (NDA (I) GAT) · MCQ · Properties of Water: Incorrect statement about properties of water PDF
- Q.101 (NDA (I) GAT) · MCQ · Organic Compounds: Compound with a sweet fruity smell PDF
- Q.102 (NDA (I) GAT) · MCQ · Chemical Bonding: Coordination numbers of ions in the NaCl lattice PDF
- Q.103 (NDA (I) GAT) · MCQ · Acids and Bases: Acid in nettle leaf hairs causing burning pain PDF
- Q.104 (NDA (I) GAT) · MCQ · Common Compounds: Chemical identity of Milk of Magnesia PDF
- Q.105 (NDA (I) GAT) · MCQ · Chemistry in Daily Life: Type of liquid crystal formed by soap with water PDF
- Q.106 (NDA (I) GAT) · MCQ · Common Compounds: Elemental composition of borax PDF
- Q.107 (NDA (I) GAT) · MCQ · Chemical Bonding: Oxide with the highest melting point PDF
- Q.130 (NDA (I) GAT) · MCQ · Atomic Structure: Scientist who proposed stable electron orbits PDF
- Q.56 (NDA (II) GAT) · MCQ · States of Matter: Term for spontaneous intermixing of particles PDF
- Q.57 (NDA (II) GAT) · MCQ · Separation Techniques: Separation technique used for blood tests PDF
- Q.58 (NDA (II) GAT) · MCQ · Elements: Which element exists as polyatomic molecules PDF
- Q.59 (NDA (II) GAT) · MCQ · Valency: Anion with a valency of -3 PDF
- Q.60 (NDA (II) GAT) · MCQ · Mole Concept: Mass of 0.5 mole of nitrogen gas PDF
- Q.61 (NDA (II) GAT) · MCQ · Chemical Reactions: Condition under which silver chloride decomposes PDF
- Q.62 (NDA (II) GAT) · MCQ · Chemistry in Daily Life: Compound used as anti-skinning agent in paints PDF
- Q.113 (NDA (II) GAT) · MCQ · Atomic Structure: Maximum electrons in the first shell of an atom PDF
- Q.114 (NDA (II) GAT) · MCQ · Properties of Water: Temperature at which water has maximum density PDF
- Q.115 (NDA (II) GAT) · MCQ · Valency: Element with a valency of 3 PDF
- Q.116 (NDA (II) GAT) · MCQ · Chemical Reactions: Which process is an oxidation reaction PDF
- Q.117 (NDA (II) GAT) · MCQ · Fertilizers: Fertilizer that is a source of nitrogen PDF
- Q.118 (NDA (II) GAT) · MCQ · Atomic Structure: Incorrect statement about aluminium's atomic particles PDF
- Q.119 (NDA (II) GAT) · MCQ · Allotropes of Carbon: Elemental composition of diamond PDF
- Q.120 (NDA (II) GAT) · MCQ · Chemical Reactions: Which process is a chemical change PDF
NDA2023
- Q.73 (NDA (I) GAT) · MCQ · Chemistry in Everyday Life: How to reduce browning of cut apples (official answer: C) PDF
- Q.74 (NDA (I) GAT) · MCQ · Hydrocarbons: Order hydrocarbons by increasing boiling point (official answer: B) PDF
- Q.75 (NDA (I) GAT) · MCQ · Separation Techniques: Apparatus to separate a benzene-water mixture (official answer: C) PDF
- Q.76 (NDA (I) GAT) · MCQ · Chemical Reactions: Reaction type when an iron nail is placed in copper sulphate (official answer: D) PDF
- Q.77 (NDA (I) GAT) · MCQ · Chemistry in Everyday Life: Unsuitable container or method for storing curd (official answer: B) PDF
- Q.78 (NDA (I) GAT) · MCQ · Acids and Bases: How toothpaste prevents tooth decay (official answer: A, C) PDF
- Q.107 (NDA (I) GAT) · MCQ · Chemistry in Everyday Life: Purpose of potassium hydroxide in making soap (official answer: B) PDF
- Q.108 (NDA (I) GAT) · MCQ · Metals: Order metals by decreasing reactivity (official answer: D) PDF
- Q.109 (NDA (I) GAT) · MCQ · Allotropes: Incorrect statement about carbon allotropes (official answer: D) PDF
- Q.110 (NDA (I) GAT) · MCQ · Industrial Chemistry: Common process for manufacturing ammonia (official answer: B) PDF
- Q.111 (NDA (I) GAT) · MCQ · Industrial Chemistry: Source of silica in glass manufacture (official answer: D) PDF
- Q.112 (NDA (I) GAT) · MCQ · Periodic Properties: Order halogens by increasing oxidising power (official answer: D) PDF
- Q.113 (NDA (I) GAT) · MCQ · Salts: Cause of the blue colour of copper sulphate crystals (official answer: C) PDF
- Q.114 (NDA (I) GAT) · MCQ · Gas Laws: Who proposed the equal volumes equal particles law (official answer: C) PDF
- Q.115 (NDA (I) GAT) · MCQ · Chemistry in Everyday Life: Chemical conversion behind airbag inflation (official answer: A) PDF
- Q.56 (NDA (II) GAT) · MCQ · Corrosion: Metal used to coat iron in galvanisation (official answer: C) PDF
- Q.57 (NDA (II) GAT) · MCQ · Alloys: Which alloy contains a non-metal (official answer: D) PDF
- Q.58 (NDA (II) GAT) · MCQ · Allotropes: Element whose allotrope is buckminsterfullerene (official answer: C) PDF
- Q.61 (NDA (II) GAT) · MCQ · Chemical Reactions: Incorrect statement about the thermite reaction (official answer: B) PDF
- Q.62 (NDA (II) GAT) · MCQ · Chemical Reactions: Match chemical processes with reaction types (official answer: C) PDF
- Q.63 (NDA (II) GAT) · MCQ · Physical and Chemical Changes: Which process involves a chemical reaction (official answer: D) PDF
- Q.64 (NDA (II) GAT) · MCQ · Metals: Metal that does not react with cold water to give hydrogen (official answer: B) PDF
- Q.65 (NDA (II) GAT) · MCQ · Chemical Reactions: Physical states of HgO, Hg and O2 in a decomposition (official answer: D) PDF
- Q.88 (NDA (II) GAT) · MCQ · Organic Chemistry: Which listed substance is not an organic compound (official answer: A) PDF
- Q.89 (NDA (II) GAT) · MCQ · Acids and Bases: Acid goldsmiths use to clean gold and silver (official answer: B) PDF
- Q.90 (NDA (II) GAT) · MCQ · Organic Chemistry: Effect of ethanol on litmus (official answer: A) PDF
- Q.91 (NDA (II) GAT) · MCQ · Alloys: Metal not essential in stainless steel (official answer: D) PDF
- Q.92 (NDA (II) GAT) · MCQ · Separation Techniques: Match mixtures with suitable separation methods (official answer: C) PDF
- Q.113 (NDA (II) GAT) · MCQ · Metallurgy: Metal extractable using carbon as reducing agent (official answer: A) PDF
- Q.114 (NDA (II) GAT) · MCQ · Colloids: Statement not true for colloidal solutions (official answer: B) PDF
- Q.115 (NDA (II) GAT) · MCQ · Separation Techniques: Best method to separate kerosene and petrol (official answer: C) PDF
- Q.116 (NDA (II) GAT) · MCQ · Atomic Structure: Dalton's symbol for phosphorus (official answer: D) PDF
- Q.117 (NDA (II) GAT) · MCQ · Carbon Compounds: Statements about bonding properties of carbon (official answer: C) PDF
NDA2022
- Q.57 (NDA (I) GAT) · MCQ · Mixtures and Solutions: Identify the item that is not a solution (official answer: D) PDF
- Q.58 (NDA (I) GAT) · MCQ · Separation Techniques: Technique used for refining petroleum (official answer: B) PDF
- Q.59 (NDA (I) GAT) · MCQ · Physical and Chemical Changes: Identify a chemical change (official answer: D) PDF
- Q.60 (NDA (I) GAT) · MCQ · Chemical Formulae: Molecular formula of ammonium carbonate from valencies (official answer: A) PDF
- Q.61 (NDA (I) GAT) · MCQ · Chemical Bonding: Identify a covalent compound (official answer: C) PDF
- Q.62 (NDA (I) GAT) · MCQ · Atomic Structure: Correct statement about argon with mass number 40 (official answer: C) PDF
- Q.63 (NDA (I) GAT) · MCQ · Valency: Order of valencies of Ne, Si, N and Mg (official answer: A) PDF
- Q.84 (NDA (I) GAT) · MCQ · Atomic Structure: Valence electrons of the element with atomic number 35 (official answer: D) PDF
- Q.85 (NDA (I) GAT) · MCQ · Chemical Reactions: Reaction that is not a redox reaction (official answer: A) PDF
- Q.86 (NDA (I) GAT) · MCQ · Allotropes of Carbon: Carbon allotrope isomorphous with crystalline silicon (official answer: B) PDF
- Q.87 (NDA (I) GAT) · MCQ · Hydrogen: Colour of hydrogen gas (official answer: D) PDF
- Q.88 (NDA (I) GAT) · MCQ · Pigments: Which compound is not a pigment (official answer: D) PDF
- Q.89 (NDA (I) GAT) · MCQ · Fertilizers: Incorrect statement about urea and fertilizers (official answer: A) PDF
- Q.90 (NDA (I) GAT) · MCQ · Carbon Compounds: Incorrect statement about carbon and its compounds (official answer: A) PDF
- Q.91 (NDA (I) GAT) · MCQ · Chemical Reactions: Identify a decomposition reaction (official answer: B) PDF
- Q.68 (NDA (II) GAT) · MCQ · Metals: Reactivity series of metals with water (official answer: A) PDF
- Q.69 (NDA (II) GAT) · MCQ · Metals: Metal that floats on cold water (official answer: C) PDF
- Q.70 (NDA (II) GAT) · MCQ · Electrolytes: Solution that does not conduct electricity (official answer: C) PDF
- Q.71 (NDA (II) GAT) · MCQ · Gases: Gas mixed with oxygen in divers' cylinders (official answer: B) PDF
- Q.72 (NDA (II) GAT) · MCQ · Chemical Reactions: Compounds that undergo thermal decomposition (official answer: C) PDF
- Q.74 (NDA (II) GAT) · MCQ · Corrosion: Compound formed when silver tarnishes (official answer: C) PDF
- Q.103 (NDA (II) GAT) · MCQ · Alloys: Composition of bronze (official answer: B) PDF
- Q.104 (NDA (II) GAT) · MCQ · Salts: Salt without water of crystallization (official answer: A) PDF
- Q.105 (NDA (II) GAT) · MCQ · Acids and Bases: Acid in a bee sting (official answer: D) PDF
- Q.106 (NDA (II) GAT) · MCQ · Organic Chemistry: Process turning vegetable oils into solid fats (official answer: A) PDF
- Q.107 (NDA (II) GAT) · MCQ · Organic Chemistry: Number of structural isomers of pentane (official answer: D) PDF
- Q.108 (NDA (II) GAT) · MCQ · States of Matter: Process when sulphur vapour forms a crust on rocks (official answer: C) PDF
- Q.109 (NDA (II) GAT) · MCQ · States of Matter: Process behind dry ice stage mist (official answer: A) PDF
- Q.110 (NDA (II) GAT) · MCQ · Organic Chemistry: Homologous series of C4H8 (official answer: B) PDF
NDA2021
- Q.56 (NDA (I) GAT) · MCQ · Chemical Formulae: Formula of hypobromous acid (official answer: B) PDF
- Q.58 (NDA (I) GAT) · MCQ · Industrial Chemistry: Material not used in glass manufacture (official answer: dropped in the final key) PDF
- Q.59 (NDA (I) GAT) · MCQ · Electrolysis: Electrolyte in electrolytic refining of copper (official answer: B) PDF
- Q.60 (NDA (I) GAT) · MCQ · Alloys: Constituents of solder (official answer: C) PDF
- Q.61 (NDA (I) GAT) · MCQ · Hydrogen: Incorrect statement about dihydrogen (official answer: D) PDF
- Q.62 (NDA (I) GAT) · MCQ · Periodic Table: Set of elements with the same valency (official answer: D) PDF
- Q.81 (NDA (I) GAT) · MCQ · Soaps and Detergents: Incorrect statement on cleansing action of soap (official answer: C) PDF
- Q.82 (NDA (I) GAT) · MCQ · Organic Reactions: Type of reaction in hydrogenation of oils (official answer: C) PDF
- Q.83 (NDA (I) GAT) · MCQ · Allotropes of Carbon: Material that is not a carbon allotrope (official answer: C) PDF
- Q.84 (NDA (I) GAT) · MCQ · Acids Bases and Salts: Reaction that does not release hydrogen (official answer: B) PDF
- Q.85 (NDA (I) GAT) · MCQ · Acids Bases and Salts: Main acid in tomatoes (official answer: C) PDF
- Q.86 (NDA (I) GAT) · MCQ · Atomic Structure: Conclusion not from Rutherford's experiment (official answer: C) PDF
- Q.87 (NDA (I) GAT) · MCQ · Chemical Reactions: Type of reaction of quicklime with water (official answer: D) PDF
- Q.100 (NDA (I) GAT) · MCQ · Acids Bases and Salts: Compound not made from common salt (official answer: C) PDF
- Q.101 (NDA (II) GAT) · MCQ · Acids Bases and Salts: Approximate pH of milk of magnesia (official answer: C) PDF
- Q.102 (NDA (II) GAT) · MCQ · Chemical Compounds: Compound used in black and white photography (official answer: B, C) PDF
- Q.103 (NDA (II) GAT) · MCQ · Chemical Compounds: Water of crystallisation in ferrous sulphate (official answer: D) PDF
- Q.104 (NDA (II) GAT) · MCQ · Chemical Reactions: Colour of precipitate from CO2 in lime water (official answer: C) PDF
- Q.105 (NDA (II) GAT) · MCQ · Periodic Table: Pair of elements liquid at room temperature (official answer: B) PDF
- Q.106 (NDA (II) GAT) · MCQ · Separation Techniques: Method to separate anthracene from salt (official answer: B) PDF
- Q.120 (NDA (II) GAT) · MCQ · Atomic Structure: Discovery from Rutherford's alpha scattering (official answer: C) PDF
- Q.121 (NDA (II) GAT) · MCQ · Atomic Structure: Maximum electrons in the M shell (official answer: C) PDF
- Q.122 (NDA (II) GAT) · MCQ · Atomic Structure: Average atomic mass of chlorine from isotope ratio (official answer: B) PDF
- Q.123 (NDA (II) GAT) · MCQ · Isotopes: Isotope used to treat cancer (official answer: C) PDF
- Q.124 (NDA (II) GAT) · MCQ · Metals: Metal coated to prevent rusting (official answer: B) PDF
- Q.125 (NDA (II) GAT) · MCQ · Metallurgy: Metal whose ore is cinnabar (official answer: C) PDF
- Q.129 (NDA (II) GAT) · MCQ · Colloids: What the Tyndall effect is (official answer: A) PDF
- Q.142 (NDA (II) GAT) · MCQ · Atomic Structure: Ion not isoelectronic with fluoride (official answer: D) PDF
- Q.143 (NDA (II) GAT) · MCQ · Chemical Bonding: Number of covalent bonds in methanol (official answer: C) PDF
- Q.144 (NDA (II) GAT) · MCQ · Chemical Compounds: Formula of Plaster of Paris (official answer: A) PDF
NDA2020
- Q.71 (NDA (I & II) GAT) · MCQ · Compounds: Compound of which chalk and marble are forms (official answer: B) PDF
- Q.72 (NDA (I & II) GAT) · MCQ · Atomic Structure: Maximum electrons in the N shell (official answer: D) PDF
- Q.73 (NDA (I & II) GAT) · MCQ · Acids and Bases: Chemical name of vinegar (official answer: A) PDF
- Q.92 (NDA (I & II) GAT) · MCQ · Allotropes of Carbon: Incorrect statement on carbon allotropes (official answer: B) PDF
- Q.93 (NDA (I & II) GAT) · MCQ · Chemical Bonding: Number of covalent bonds in chloropropane (official answer: D) PDF
- Q.94 (NDA (I & II) GAT) · MCQ · Periodic Table: Most fundamental characteristic of an element (official answer: B) PDF
- Q.95 (NDA (I & II) GAT) · MCQ · Atomic Structure: Discoverer of the neutron (official answer: A) PDF
- Q.96 (NDA (I & II) GAT) · MCQ · Atomic Structure: What atomic mass is the sum of (official answer: B) PDF
- Q.97 (NDA (I & II) GAT) · MCQ · Radioactivity: Isotope used in cancer treatment (official answer: B) PDF
- Q.124 (NDA (I & II) GAT) · MCQ · Fuels: Incorrect statement about biomass and biogas (official answer: D) PDF
- Q.140 (NDA (I & II) GAT) · MCQ · Fuels: Largest component of biogas (official answer: B) PDF
- Q.143 (NDA (I & II) GAT) · MCQ · Compounds: Product of baking soda decomposition used in baking (official answer: A) PDF
- Q.144 (NDA (I & II) GAT) · MCQ · Compounds: Water of crystallisation in three salts (official answer: A) PDF
- Q.145 (NDA (I & II) GAT) · MCQ · Acids and Bases: Colour changes of a turmeric stain washed with soap (official answer: B) PDF
- Q.146 (NDA (I & II) GAT) · MCQ · Compounds: Correct statement on bleaching powder and DDT (official answer: C) PDF
- Q.147 (NDA (I & II) GAT) · MCQ · Compounds: Best example of a desiccant (official answer: A) PDF
- Q.148 (NDA (I & II) GAT) · MCQ · Acids and Bases: First mineral acid discovered (official answer: C) PDF
NDA2019
- Q.60 (NDA (I) GAT) · MCQ · Nuclear Fuel: Mineral used as fuel in nuclear power stations (official answer: D) PDF
- Q.61 (NDA (I) GAT) · MCQ · Soaps and Detergents: Compound that is not a synthetic detergent (official answer: C) PDF
- Q.62 (NDA (I) GAT) · MCQ · Fuels: Example of a clean fuel (official answer: B) PDF
- Q.63 (NDA (I) GAT) · MCQ · Metals: Metal that does not react with cold water (official answer: C) PDF
- Q.64 (NDA (I) GAT) · MCQ · Atomic Structure: Pair of isoelectronic ions (official answer: B) PDF
- Q.65 (NDA (I) GAT) · MCQ · Paints: Binder used in paints (official answer: B) PDF
- Q.82 (NDA (I) GAT) · MCQ · Redox Reactions: Incorrect statement on iron reacting with copper sulphate (official answer: C) PDF
- Q.83 (NDA (I) GAT) · MCQ · Acids and Bases: Organic acid among options (official answer: C) PDF
- Q.84 (NDA (I) GAT) · MCQ · Chemical Reactions: Why N2 and O2 in air do not form oxides (official answer: C) PDF
- Q.86 (NDA (I) GAT) · MCQ · Equivalent Weight: Equivalent weight of hydrated oxalic acid (official answer: B) PDF
- Q.101 (NDA (I) GAT) · MCQ · Corrosion: Green coating formed on copper in moist air (official answer: A) PDF
- Q.102 (NDA (I) GAT) · MCQ · Acids and Bases: Substance not giving CO2 with hydrochloric acid (official answer: B) PDF
- Q.103 (NDA (I) GAT) · MCQ · Mixtures: Substance that is not a mixture (official answer: A) PDF
- Q.56 (NDA (II) GAT) · MCQ · Oxidation Number: Compound without different oxidation numbers of one element (official answer: C) PDF
- Q.57 (NDA (II) GAT) · MCQ · Glass: Incorrect statement about glass (official answer: C) PDF
- Q.58 (NDA (II) GAT) · MCQ · States of Matter: Boiling versus evaporation as surface or bulk phenomena (official answer: D) PDF
- Q.59 (NDA (II) GAT) · MCQ · Allotropes of Carbon: Incorrect statement about diamond and graphite (official answer: B) PDF
- Q.60 (NDA (II) GAT) · MCQ · Cement: Raw materials of Portland cement (official answer: C) PDF
- Q.61 (NDA (II) GAT) · MCQ · Water: Incorrect statement about water (official answer: D) PDF
- Q.62 (NDA (II) GAT) · MCQ · Soaps and Detergents: Metal present in soft soap (official answer: B) PDF
- Q.73 (NDA (II) GAT) · MCQ · Compounds: Substance that is not calcium carbonate (official answer: A) PDF
- Q.74 (NDA (II) GAT) · MCQ · Soaps and Detergents: Principle by which soaps clean surfaces (official answer: D) PDF
- Q.75 (NDA (II) GAT) · MCQ · Mixtures: Substance that is not a mixture (official answer: A) PDF
- Q.76 (NDA (II) GAT) · MCQ · Compounds: What 'dry ice' refers to (official answer: C) PDF
- Q.88 (NDA (II) GAT) · MCQ · Hydrogen: Hydrides that can store large volumes of hydrogen (official answer: C) PDF
- Q.89 (NDA (II) GAT) · MCQ · Elements: Element that is not monatomic (official answer: C) PDF
- Q.90 (NDA (II) GAT) · MCQ · Reactivity Series: Order of electron-releasing tendency of metals (official answer: A) PDF
- Q.91 (NDA (II) GAT) · MCQ · Fuels: Major constituent of biogas (official answer: C) PDF
NDA2018
- Q.63 (NDA (I) GAT) · MCQ · Acids and Bases: Acid injected by nettle leaves (official answer: B) PDF
- Q.64 (NDA (I) GAT) · MCQ · Acids and Bases: Property of toothpaste (official answer: C) PDF
- Q.65 (NDA (I) GAT) · MCQ · Acids and Bases: Substance with highest H⁺ concentration (official answer: D) PDF
- Q.66 (NDA (I) GAT) · MCQ · Common Compounds: Composition of brine (official answer: A) PDF
- Q.67 (NDA (I) GAT) · MCQ · Common Compounds: Formula of washing soda (official answer: B) PDF
- Q.68 (NDA (I) GAT) · MCQ · Common Compounds: Incorrect statement on bleaching powder (official answer: A) PDF
- Q.84 (NDA (I) GAT) · MCQ · Common Compounds: Water molecules in plaster of Paris (official answer: A) PDF
- Q.85 (NDA (I) GAT) · MCQ · Allotropes of Carbon: How carbon black is obtained (official answer: C) PDF
- Q.86 (NDA (I) GAT) · MCQ · Allotropes of Carbon: Incorrect property of graphite (official answer: A) PDF
- Q.87 (NDA (I) GAT) · MCQ · Allotropes of Carbon: Purest form of carbon (official answer: C) PDF
- Q.88 (NDA (I) GAT) · MCQ · Chemistry in Daily Life: Why carbon monoxide is poisonous (official answer: B) PDF
- Q.106 (NDA (I) GAT) · MCQ · Metals and Non-Metals: Alkali metal with lowest melting point (official answer: D) PDF
- Q.107 (NDA (I) GAT) · MCQ · Metals and Non-Metals: Metal alloyed with sodium as reactor coolant (official answer: A) PDF
- Q.108 (NDA (I) GAT) · MCQ · Metals and Non-Metals: Metal used in photoelectric cell filaments (official answer: C) PDF
- Q.62 (NDA (II) GAT) · MCQ · Valency: Electrons gained by element 8 bonding with sodium (official answer: B) PDF
- Q.63 (NDA (II) GAT) · MCQ · Atomic Structure: Average atomic mass from isotope ratio (official answer: D) PDF
- Q.64 (NDA (II) GAT) · MCQ · Mixtures: Identify a heterogeneous mixture (official answer: C) PDF
- Q.65 (NDA (II) GAT) · MCQ · Mole Concept: Formula mass of sodium carbonate (official answer: B) PDF
- Q.66 (NDA (II) GAT) · MCQ · Common Compounds: Composition of syngas (official answer: C) PDF
- Q.69 (NDA (II) GAT) · MCQ · Gas Laws: Pressure after replacing argon with half as many CO2 molecules (official answer: C) PDF
- Q.78 (NDA (II) GAT) · MCQ · Properties of Water: Method that cannot remove permanent hardness (official answer: C) PDF
- Q.79 (NDA (II) GAT) · MCQ · Chemical Reactions: Reaction giving nitric oxide as product (official answer: A) PDF
- Q.80 (NDA (II) GAT) · MCQ · Acids and Bases: Identify a tribasic acid (official answer: D) PDF
- Q.81 (NDA (II) GAT) · MCQ · Allotropes of Carbon: Incorrect statement on diamond and graphite (official answer: D) PDF
- Q.82 (NDA (II) GAT) · MCQ · Common Compounds: Substance known as dry ice (official answer: A) PDF
- Q.103 (NDA (II) GAT) · MCQ · Acids and Bases: Solution with pH below 7 (official answer: C) PDF
- Q.104 (NDA (II) GAT) · MCQ · Chemical Reactions: Identify a redox reaction (official answer: C) PDF
- Q.105 (NDA (II) GAT) · MCQ · Chemistry in Daily Life: Compound not used as fertiliser (official answer: B) PDF
- Q.106 (NDA (II) GAT) · MCQ · Common Compounds: Formula of gypsum (official answer: A) PDF
- Q.107 (NDA (II) GAT) · MCQ · Laws of Chemical Combination: Statement of law of conservation of mass (official answer: C) PDF
NDA2017
- Q.56 (NDA (I) GAT) · MCQ · Allotropes of Carbon: Allotrope with cage-like molecules (official answer: D) PDF
- Q.57 (NDA (I) GAT) · MCQ · Properties of Water: Salts causing temporary hardness (official answer: A) PDF
- Q.59 (NDA (I) GAT) · MCQ · Metals and Non-Metals: Alkali metal least reactive with water (official answer: A) PDF
- Q.60 (NDA (I) GAT) · MCQ · Atomic Structure: Discovery from Rutherford's alpha scattering (official answer: C) PDF
- Q.61 (NDA (I) GAT) · MCQ · States of Matter: Nature of glass (official answer: C) PDF
- Q.89 (NDA (I) GAT) · MCQ · Separation Techniques: Separating two miscible liquids (official answer: C) PDF
- Q.90 (NDA (I) GAT) · MCQ · Organic Chemistry: Element forming the most compounds (official answer: D) PDF
- Q.91 (NDA (I) GAT) · MCQ · Metals and Non-Metals: Element that corrodes rapidly (official answer: B) PDF
- Q.92 (NDA (I) GAT) · MCQ · Solutions: Mass percentage of salt in a solution (official answer: C) PDF
- Q.93 (NDA (I) GAT) · MCQ · Valency: What valency depends on (official answer: D) PDF
- Q.94 (NDA (I) GAT) · MCQ · Noble Gases: Match noble gases with uses (official answer: D) PDF
- Q.125 (NDA (I) GAT) · MCQ · Noble Gases: Nature of radon (official answer: A) PDF
- Q.126 (NDA (I) GAT) · MCQ · Common Compounds: Chemical name of baking soda (official answer: B) PDF
- Q.127 (NDA (I) GAT) · MCQ · Allotropes of Carbon: Element used in pencil lead (official answer: C) PDF
- Q.79 (NDA (II) GAT) · MCQ · Atomic Structure: Ionisation energy of hydrogen in ground state (official answer: B) PDF
- Q.80 (NDA (II) GAT) · MCQ · Properties of Water: Composition of bubbles in boiling water (official answer: D) PDF
- Q.81 (NDA (II) GAT) · MCQ · Acids and Bases: Compound giving a conducting basic solution (official answer: D) PDF
- Q.82 (NDA (II) GAT) · MCQ · Common Compounds: Principal use of hydrofluoric acid (official answer: A) PDF
- Q.83 (NDA (II) GAT) · MCQ · Atomic Structure: Species with the same number of electrons (official answer: C) PDF
- Q.84 (NDA (II) GAT) · MCQ · Mole Concept: Mass percentages of elements in CH2O (official answer: C) PDF
- Q.85 (NDA (II) GAT) · MCQ · Gas Laws: Name of equal-volumes equal-molecules law (official answer: A) PDF
- Q.115 (NDA (II) GAT) · MCQ · Mole Concept: Mass of CO2 from burning 1 kg carbon (official answer: A) PDF
- Q.116 (NDA (II) GAT) · MCQ · Metals and Non-Metals: Why zinc protects iron from corrosion (official answer: A) PDF
- Q.118 (NDA (II) GAT) · MCQ · Physical and Chemical Changes: Identify a chemical change (official answer: B) PDF
- Q.119 (NDA (II) GAT) · MCQ · Common Compounds: Chemical used as washing soda (official answer: C) PDF
- Q.120 (NDA (II) GAT) · MCQ · Chemistry in Daily Life: Why KMnO4 purifies drinking water (official answer: D) PDF
- Q.138 (NDA (II) GAT) · MCQ · Environmental Chemistry: Cause of acid rain (official answer: C) PDF
- Q.139 (NDA (II) GAT) · MCQ · Acids and Bases: Desirable pH range of drinking water (official answer: A) PDF
- Q.140 (NDA (II) GAT) · MCQ · Chemical Reactions: Oxidation and reduction in methane combustion (official answer: B) PDF
NDA2016
- Q.51 (NDA (I) GAT) · MCQ · Petroleum: Statement pair on petroleum composition and grade (official answer: B) PDF
- Q.58 (NDA (I) GAT) · MCQ · Common Compounds: Form of phosphorus used in safety matches (official answer: A) PDF
- Q.59 (NDA (I) GAT) · MCQ · Physical and Chemical Changes: Identify the change that is not chemical (official answer: C) PDF
- Q.60 (NDA (I) GAT) · MCQ · Environmental Chemistry: Vehicle pollutants harmful even at low levels (official answer: D) PDF
- Q.64 (NDA (I) GAT) · MCQ · Chemistry in Daily Life: Fatty acids whose salts form soap (official answer: D) PDF
- Q.72 (NDA (I) GAT) · MCQ · Atomic Structure: Neutrons in a carbon atom with mass number 12 (official answer: B) PDF
- Q.73 (NDA (I) GAT) · MCQ · Chemical Reactions: Identify the reduction reaction (official answer: C) PDF
- Q.74 (NDA (I) GAT) · MCQ · Chemistry in Daily Life: Household items releasing Bisphenol A (official answer: C) PDF
- Q.80 (NDA (I) GAT) · MCQ · Common Compounds: Nitrogen oxide that is the anhydride of nitric acid (official answer: D) PDF
- Q.81 (NDA (I) GAT) · MCQ · Common Compounds: Chemical name of baking soda (official answer: A) PDF
- Q.87 (NDA (I) GAT) · MCQ · States of Matter: Name of solid turning directly into gas (official answer: C) PDF
- Q.88 (NDA (I) GAT) · MCQ · Common Compounds: Composition of water gas (official answer: A) PDF
- Q.95 (NDA (I) GAT) · MCQ · Acids and Bases: Solution that turns phenolphthalein pink (official answer: B) PDF
- Q.96 (NDA (I) GAT) · MCQ · Common Compounds: Oxide that dissolves in water (official answer: D) PDF
- Q.100 (NDA (I) GAT) · MCQ · States of Matter: Order of compressibility of solid, liquid and gas (official answer: B) PDF
- Q.101 (NDA (I) GAT) · MCQ · States of Matter: What melting point indicates (official answer: A) PDF
- Q.103 (NDA (I) GAT) · MCQ · Metals and Non-Metals: Element not giving H2 with dilute HCl (official answer: A) PDF
- Q.111 (NDA (I) GAT) · MCQ · Organic Chemistry: Carbon compound that burns without sooty flame (official answer: B) PDF
- Q.120 (NDA (I) GAT) · MCQ · Organic Chemistry: Moles of H2 needed to saturate benzene (official answer: C) PDF
- Q.62 (NDA (II) GAT) · MCQ · Physical and Chemical Changes: Match processes with type of change (official answer: A) PDF
- Q.63 (NDA (II) GAT) · MCQ · Valency: Element with zero valency (official answer: D) PDF
- Q.64 (NDA (II) GAT) · MCQ · Atomic Structure: Atomic number from protons, electrons, neutrons (official answer: A) PDF
- Q.65 (NDA (II) GAT) · MCQ · Mole Concept: Which sample has a different number of molecules (official answer: D) PDF
- Q.66 (NDA (II) GAT) · MCQ · Chemical Reactions: Volumes of ammonia from nitrogen and hydrogen (official answer: B) PDF
- Q.94 (NDA (II) GAT) · MCQ · Valency: Match elements with highest valency (official answer: B) PDF
- Q.95 (NDA (II) GAT) · MCQ · Chemical Reactions: Species unable to disproportionate (official answer: D) PDF
- Q.96 (NDA (II) GAT) · MCQ · Chemical Bonding: Directional nature of bonds (official answer: A) PDF
- Q.97 (NDA (II) GAT) · MCQ · Chemistry in Daily Life: First step when striking a safety match (official answer: C) PDF
- Q.98 (NDA (II) GAT) · MCQ · Chemistry in Daily Life: Why a sulfur compound is added to LPG (official answer: C) PDF
- Q.102 (NDA (II) GAT) · MCQ · Chemistry in Daily Life: Why fluoride toothpaste is recommended (official answer: B) PDF
- Q.133 (NDA (II) GAT) · MCQ · Chemistry in Daily Life: Additive that lowers setting time of cement (official answer: D) PDF
- Q.134 (NDA (II) GAT) · MCQ · Colloids: What an emulsion is (official answer: D) PDF
- Q.135 (NDA (II) GAT) · MCQ · Chemistry in Daily Life: Product of mixing ashes with animal fat (official answer: B) PDF
- Q.141 (NDA (II) GAT) · MCQ · Acids and Bases: Gas giving acidic solution in water (official answer: B) PDF
- Q.142 (NDA (II) GAT) · MCQ · Mole Concept: Moles of hydrogen atoms in aluminium hydroxide (official answer: C) PDF
Other General Knowledge topics
- Physics PYQs
- General Science and Biology PYQs
- History and Freedom Movement PYQs
- Geography PYQs
- Polity and Economy PYQs
- Current Events PYQs
FAQ
How many Chemistry questions come in NDA?
In the official papers we tagged: 30 in 2026 (2 papers), 31 in 2025 (2 papers), 30 in 2024 (2 papers), 33 in 2023 (2 papers), 29 in 2022 (2 papers), 30 in 2021 (2 papers), 17 in 2020 (1 paper), 28 in 2019 (2 papers), 30 in 2018 (2 papers), 29 in 2017 (2 papers) and 35 in 2016 (2 papers). That is 322 questions in all, about 15% of General Knowledge.
Which Chemistry topics repeat in NDA?
Asked in the most papers: Atomic Structure, Chemical Reactions, Acids and Bases. The concept table lists every one with its count.
Are these official NDA questions?
Yes. Every question is from an official NDA paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.