Preparing for the WAEC GCE Chemistry 2025 examination requires hard work, discipline, and the right study resources. Chemistry is a subject that blends both theoretical knowledge and practical application, making it one of the most engaging yet challenging subjects in the WAEC GCE syllabus.
To help you study effectively, this guide provides a mix of practice past questions with answers, explanations, and study tips to sharpen your preparation. By the end of this article, you’ll understand key Chemistry concepts, practice how WAEC frames questions, and learn strategies to score higher in the exam.
SEE ALSO;WAEC GCE Physics Past Questions and Answers 2025
Why You Should Practice WAEC GCE Chemistry Past Questions
Many candidates underestimate the importance of practicing past questions, yet research shows that consistent exposure to likely exam questions boosts performance. Here’s why:
-
Familiarity with Question Style – WAEC often repeats or rephrases questions from previous years. Practicing gives you an edge.
-
Better Time Management – The Chemistry paper involves calculations, equations, and explanations that require speed and accuracy. Past questions help you train under exam-like conditions.
-
Increased Confidence – Entering the exam hall with prior practice reduces anxiety and builds confidence.
-
Improved Understanding of Key Topics – Practicing reveals which areas you’re strong in and which need extra revision.
WAEC GCE Chemistry 2025: Practice Questions and Answers
Below are carefully selected sample practice questions with worked-out answers and explanations to guide you. These cover both the objective and theory sections, just as you’ll encounter in the exam.
Section A: Objective Questions (Multiple Choice)
1. Which of the following is a noble gas?
A. Oxygen
B. Argon
C. Nitrogen
D. Chlorine
Correct Answer: B. Argon
Explanation: Noble gases are elements in Group 18 of the periodic table. They include helium, neon, argon, krypton, xenon, and radon. They are chemically inert because of their stable electronic configuration.
2. Which of the following has the highest electronegativity?
A. Fluorine
B. Sodium
C. Carbon
D. Oxygen
Correct Answer: A. Fluorine
Explanation: Fluorine is the most electronegative element, meaning it has the highest ability to attract electrons in a chemical bond.
3. What is the pH of a 0.001 M HCl solution?
A. 1
B. 2
C. 3
D. 4
Correct Answer: C. 3
Explanation: pH = –log [H⁺]. Since [H⁺] = 0.001 = 10⁻³, pH = –log (10⁻³) = 3.
4. Which process is not an oxidation reaction?
A. Rusting of iron
B. Burning of coal
C. Photosynthesis
D. Respiration
Correct Answer: C. Photosynthesis
Explanation: Rusting, burning, and respiration involve oxidation, but photosynthesis is primarily a reduction process where carbon dioxide is reduced to glucose.
5. Which gases are required for the manufacture of ammonia in the Haber process?
A. Oxygen and Carbon dioxide
B. Nitrogen and Hydrogen
C. Nitrogen and Oxygen
D. Hydrogen and Carbon dioxide
Correct Answer: B. Nitrogen and Hydrogen
Explanation: The Haber process synthesizes ammonia (NH₃) from nitrogen and hydrogen gases using an iron catalyst under high temperature and pressure.
Section B: Theory Practice Questions
1. Define isotopes and give two examples.
Answer: Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. Examples: Carbon-12 and Carbon-14, Chlorine-35 and Chlorine-37.
2. State three physical properties of acids.
Answer:
-
They taste sour (though not recommended to test by taste in the lab).
-
They turn blue litmus paper red.
-
They react with metals, bases, and carbonates.
3. Write a balanced chemical equation for the reaction between sodium hydroxide and hydrochloric acid.
Answer:
NaOH + HCl → NaCl + H₂O
This is a neutralization reaction where an acid reacts with a base to produce salt and water.
4. Describe a simple test for sulphate ions in a solution.
Answer:
-
Add a few drops of dilute HCl to the solution.
-
Then add barium chloride solution.
-
A dense white precipitate of barium sulphate confirms the presence of sulphate ions.
5. Differentiate between exothermic and endothermic reactions, giving one example each.
Answer:
-
Exothermic reaction: A reaction that releases heat energy to the surroundings (e.g., combustion of methane).
-
Endothermic reaction: A reaction that absorbs heat energy from the surroundings (e.g., thermal decomposition of calcium carbonate).
Common Topics in WAEC GCE Chemistry 2025
If you want to focus your study, pay attention to the following high-yield topics, which frequently appear in WAEC Chemistry papers:
-
Atomic structure and the periodic table
-
Chemical bonding and molecular structure
-
States of matter and gas laws
-
Acids, bases, and salts
-
Electrolysis
-
Organic chemistry (hydrocarbons, alcohols, carboxylic acids)
-
Thermodynamics and energy changes in reactions
-
Qualitative and quantitative analysis
-
Chemistry of transition metals
-
Environmental chemistry (pollution, green chemistry, etc.)
Study Tips for WAEC GCE Chemistry 2025
-
Start Early – Don’t wait until the exam timetable is out. Begin revision months in advance.
-
Master Calculations – Focus on mole concepts, titrations, gas laws, and stoichiometry as they carry high marks.
-
Understand Practical Chemistry – Be able to identify gases, salts, and ions through simple laboratory tests.
-
Use Diagrams – Draw molecular structures, laboratory setups, and energy profile diagrams to improve memory retention.
-
Revise with Past Papers – Dedicate at least 2–3 hours weekly to past questions under timed conditions.
-
Form a Study Group – Studying with peers encourages idea exchange and exposes you to different problem-solving techniques.
-
Stay Consistent – Short daily revision is better than long, irregular study periods.
Final Thoughts
The WAEC GCE Chemistry 2025 examination can be passed with ease if you prepare strategically. By studying the syllabus, practicing past questions, and focusing on key topics, you position yourself for success.
For more information visit Waec Official website here;https://registration.waecdirect.org/
Remember: Chemistry is not just about memorizing reactions—it’s about understanding why and how they occur. With consistent practice, exam strategies, and confidence, you can achieve excellent results.
Take time to practice the questions above, revisit weak areas, and enter the exam hall prepared. Success in Chemistry is achievable with discipline, determination, and smart study habits.