Preparing for the 2025/2026 JAMB Chemistry exam? One of the smartest ways to study is to focus on repeated and high-frequency topics. JAMB tends to follow a pattern when setting questions, and Chemistry is no exception. Mastering these commonly asked topics gives you a strong advantage and boosts your chances of scoring 70% and above.
In this guide, we’ve compiled a complete list of the most repeated Chemistry topics in JAMB exams, including tips, subtopics, and question focus areas.
Most Repeated Topics in JAMB Chemistry (2025/2026)
Here is the full list of topics that JAMB has consistently repeated over the years and are expected again in 2025:
1. Atomic Structure
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Atomic number, mass number
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Isotopes and ions
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Electron configuration (Aufbau principle, Hund’s rule)
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Periodic table trends: atomic radius, ionization energy
JAMB Tip: Questions often test on how to identify elements or determine valency from electron configuration.
2. Chemical Bonding
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Ionic, covalent, and metallic bonding
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Hybridization and bond angles
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Intermolecular forces (hydrogen bonding, van der Waals)
JAMB Tip: Know the difference between types of bonding and examples of substances that exhibit them.
3. Periodic Table and Periodicity
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Groups and periods
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Properties of elements across periods and down groups
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Trends in electronegativity, metallic/non-metallic character
JAMB Tip: Watch out for questions asking you to compare properties of Group 1 or Group 7 elements.
4. Acids, Bases and Salts
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Arrhenius and Bronsted-Lowry definitions
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pH scale and calculations
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Strong vs weak acids/bases
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Neutralization reactions
JAMB Tip: You’ll likely calculate pH or identify products of acid-base reactions.
5. Chemical Reactions and Stoichiometry
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Types of chemical reactions (combination, decomposition, etc.)
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Balancing equations
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Mole concept and Avogadro’s law
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Limiting reagent calculations
JAMB Tip: Master mole calculations — they appear in at least 2–3 questions every year.
6. States of Matter
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Gas laws (Boyle’s, Charles’, Ideal Gas Law)
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Kinetic theory of gases
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Changes of state: melting, boiling, sublimation
JAMB Tip: Expect numerical problems involving PV=nRT.
7. Thermochemistry
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Exothermic vs endothermic reactions
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Enthalpy change (ΔH)
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Heat of reaction, combustion, and formation
JAMB Tip: Be prepared for calorimetry calculations.
8. Equilibrium Systems
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Reversible reactions
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Le Chatelier’s Principle
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Factors affecting equilibrium (temperature, pressure, concentration)
JAMB Tip: Conceptual questions on shifts in equilibrium are frequently repeated.
9. Rates of Reaction
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Factors affecting rate (surface area, catalyst, temperature)
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Activation energy
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Graph interpretation
JAMB Tip: Understand how different factors influence reaction speed.
10. Electrolysis
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Electrolytes and non-electrolytes
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Faraday’s laws of electrolysis
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Electrochemical cells and electrode reactions
JAMB Tip: Questions often involve identifying products at electrodes and calculating mass deposited.
11. Organic Chemistry
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Alkanes, alkenes, alkynes: nomenclature and reactions
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Functional groups: alcohols, ketones, esters, carboxylic acids
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Isomerism
JAMB Tip: Pay attention to reaction mechanisms and naming organic compounds correctly.
12. Chemical Kinetics and Catalysis
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Role of catalysts
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Effect on reaction rate
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Enzyme activity as biological catalysts
13. Redox Reactions
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Oxidation numbers
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Identifying oxidizing and reducing agents
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Balancing redox reactions
14. Water and Environmental Chemistry
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Water treatment methods
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Hardness of water and removal
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Pollution and green chemistry
15. Nuclear Chemistry
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Radioactivity
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Half-life calculations
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Uses of radioactive isotopes
Bonus: JAMB Chemistry Exam Strategy
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Use past questions to identify repeated patterns.
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Focus on definitions, laws, and short calculations.
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Master basic formulas and keep them at your fingertips.
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Practice time management—50 questions in 40 minutes means less than a minute per question.
FAQs – Most Repeated JAMB Chemistry Topics 2025
1. What are the most repeated topics in JAMB Chemistry?
The most repeated include Atomic Structure, Organic Chemistry, Electrolysis, Acids and Bases, and Gas Laws.
2. How many Chemistry questions are asked in JAMB?
JAMB usually sets 40 to 50 questions in Chemistry depending on the format.
3. Does JAMB repeat Chemistry questions?
Yes. JAMB recycles questions, especially from key topics. This is why studying past questions is very effective.
4. How can I score above 70 in JAMB Chemistry?
Study the repeated topics, solve many past questions, and understand basic concepts instead of cramming.
5. Is Organic Chemistry compulsory in JAMB Chemistry?
Yes. At least 5 to 6 questions come from Organic Chemistry every year.
Conclusion
Scoring high in Chemistry for JAMB 2025/2026 is achievable if you focus your efforts on what matters most. This list of the most repeated topics in JAMB Chemistry gives you a focused direction for your preparation. Combine this guide with daily practice and past questions, and you’ll be far ahead of the competition.
