Most Repeated WAEC Chemistry Topics, Questions and Answers 2025/2026

As you prepare for the Chemistry exam in 2025/2026, it’s important to know the most repeated topics, questions, and answers in Chemistry. Focusing on these common areas can help you understand what to expect in the exam and give you a better chance of scoring high.

In this post, I’ll be showing you the most repeated Chemistry topics, questions, and answers for the 2025/2026 exam. If you've been asking yourself questions like:
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Why Study the Most Repeated Chemistry Topics and Questions?

WAEC Chemistry is a broad subject. But the truth is, Chemistry repeats questions — sometimes exactly, other times with little changes.

By knowing the most repeated Chemistry topics, you’ll:

• Study less, but smarter

• Answer more questions correctly

• Understand the exam pattern

Many successful candidates study this way — and now it’s your turn to do the same.

Most Repeated Chemistry Topics (2025/2026)

Below are the top Chemistry topics WAEC likes to bring up almost every year. Focus your revision on these:

1. Atomic Structure and Periodic Table

   • Structure of the atom

   • Atomic number, mass number

   • Periodic trends and group properties

2. Chemical Bonding

   • Ionic, covalent, and metallic bonds

   • Properties of compounds based on bond type

3. Acids, Bases, and Salts

   • Properties and examples

   • pH scale and indicators

   • Neutralization reactions

4. States of Matter and Gas Laws

   • Properties of solids, liquids, and gases

   • Boyle’s law, Charles’s law, Ideal gas law

5. Chemical Reactions and Equations

   • Types of reactions: combination, decomposition, displacement

   • Balancing equations

6. Stoichiometry and Mole Concept

   • Mole calculations

   • Empirical and molecular formulae

   • Percentage composition

7. Organic Chemistry

   • Alkanes, alkenes, alkynes

   • Functional groups

   • Reactions of hydrocarbons

8. Electrolysis

   • Principles of electrolysis

   • Electrolytes and non-electrolytes

   • Electroplating and industrial uses

9. Thermochemistry

   • Exothermic and endothermic reactions

   • Enthalpy changes

   • Calorimetry

10. Equilibrium and Rates of Reaction

    • Dynamic equilibrium

    • Factors affecting rate (temperature, surface area, catalysts)

11. Solubility and Separation Techniques

    • Solubility curves

    • Crystallization, distillation, filtration

12. Water and Environmental Chemistry

    • Water treatment methods

    • Hardness and softness of water

    • Pollution and atmospheric chemistry

13. Metals and Their Compounds

    • Extraction of metals

    • Properties and uses

    • Reactivity series

14. Non-Metals and Their Compounds

    • Properties of chlorine, sulfur, nitrogen

    • Uses and environmental effects

15. Laboratory Techniques and Safety

    • Common apparatus

    • Safety rules and first aid

    • Measurement and data handling

Most Repeated Chemistry Questions (2025/2026)

Here are some frequently repeated WAEC Chemistry questions. Practice them to boost your confidence:

• What is the electron configuration of oxygen?

• Define an acid and give two examples.

• Balance the equation: NaOH + H₂SO₄ → Na₂SO₄ + H₂O

• State Boyle’s Law and give its mathematical expression.

• Calculate the molar mass of H₂SO₄.

• Differentiate between covalent and ionic bonding.

• List two differences between metals and non-metals.

• Explain the process of electrolysis with examples.

• Name two methods of purifying water.

• Describe the preparation of oxygen in the laboratory.

📌 Want the complete correct answers with explanations?
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Study Tips to Use Chemistry Questions and Topics Effectively

To pass Chemistry with these repeated topics and questions, follow these tips:

1. ✅ Make a Simple Study Plan

   • Break your study into daily or weekly goals using these 15 key Chemistry topics.

2. ✅ Practice with Past Questions

   • Don’t just read — actively solve past questions and mark your progress.

3. ✅ Use Flashcards & Diagrams

   • Chemistry involves many equations and diagrams. Use visual aids to improve memory.

4. ✅ Learn with Friends

   • Join group discussions or study groups to explain difficult topics faster.

5. ✅ Revise Frequently

   • Read, test yourself, and revise again. Repetition helps improve memory retention.

6. ✅ Download the Answers to These Questions

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👉 Click here study the Most Repeated Chemistry Questions and Answers

FAQ – Most Repeated Chemistry Topics, Questions and Answers

Here are 10 common questions students ask about Chemistry:

1. Are Chemistry questions repeated every year?
   Yes, WAEC often repeats questions with little or no changes, especially in theory and objective sections.

2. Can I pass Chemistry by studying only past questions?
   You’ll pass better if you also understand the topics behind the questions. Don’t just cram answers.

3. Which topics are most common in Chemistry?
   Topics like organic chemistry, acids and bases, atomic structure, and bonding come up every year.

4. Is Chemistry harder than other science subjects?
   Not really. With proper preparation and focus on key topics, it can be one of the easiest science subjects.

5. Where can I download Chemistry questions and answers PDF?
   You can click the link above to access a free, downloadable PDF.

6. Do WAEC GCE and SSCE use the same Chemistry syllabus?
   Yes, both exams use the same syllabus and often have similar or identical questions.

7. What type of diagrams are usually asked in Chemistry?
   Common ones include laboratory apparatus, electrolysis setup, and molecular structures.

8. How do I study Chemistry definitions and processes easily?
   Use flashcards and quiz apps, and explain what you’ve learned to others. Teaching helps retention.

9. Are these questions useful for NECO too?
   Yes. WAEC and NECO often test similar topics. The questions and study tips apply to both.

10. When should I start preparing for Chemistry?
    Start at least 3–4 months before your exam. The earlier, the better your confidence and understanding.