WAEC 2025 Chemistry Questions and Answers (OBJ & Theory) – Likely Exam Tips

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Are you getting ready for the WAEC 2025 Chemistry exam? This post provides a complete guide to help you succeed, including likely Chemistry questions and answers, exam structure, sample solutions, and study tips. Whether you’re targeting distinction or just aiming to pass confidently, this guide is for you.

WAEC 2025 Chemistry questions and answers

WAEC 2025 Chemistry Exam Format

The Chemistry paper in WAEC is divided into two parts:

  • Paper 1 (Objective): 50 multiple-choice questions

  • Paper 2 (Theory/Essay): Structured theory questions, including calculations and explanations

  • (Practical Paper is separate and not covered in this post)

More OBJ/essay  questions and answers will be uploaded closer to the exam day. Bookmark this page and keep checking.

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WAEC 2025 Chemistry Likely Theory Questions and Answers

These questions are based on repeated WAEC patterns and current syllabus expectations.

Question 1

State two differences between a compound and a mixture.

✅ Answer:

Compound Mixture
Chemically combined Physically combined
Fixed composition Variable composition
Properties differ from elements Properties retained

Question 2

Balance the following chemical equation:
C₂H₆ + O₂ → CO₂ + H₂O

✅ Answer:
Balanced Equation: 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

Question 3

Calculate the number of moles in 11g of CO₂ (Molar Mass = 44 g/mol).

✅ Answer:
Moles = Mass / Molar Mass = 1144=0.25 mol\frac{11}{44} = 0.25 \, \text{mol}

Question 4

List two factors that affect the rate of a chemical reaction.

✅ Answer:

  • Temperature

  • Surface area of reactants

  • Presence of a catalyst

  • Concentration of reactants

Question 5

Differentiate between exothermic and endothermic reactions with examples.

✅ Answer:

  • Exothermic: Releases heat (e.g., combustion of methane)

  • Endothermic: Absorbs heat (e.g., photosynthesis)

Read also:

WAEC 2025 Chemistry OBJ Questions and Answers (Samples)

  1. Which of the following is a noble gas?
    A. Oxygen
    ✅ B. Argon
    C. Nitrogen
    D. Hydrogen

  2. Which of these is a chemical change?
    A. Melting of ice
    ✅ B. Rusting of iron
    C. Boiling water
    D. Breaking glass

  3. The atomic number of an element is 9. How many electrons are in its atom?
    ✅ Answer: 9 electrons

  4. What is the IUPAC name of NaCl?
    ✅ Answer: Sodium chloride

  5. Which of the following is used as a drying agent?
    A. NaCl
    ✅ B. CaCl₂
    C. H₂O
    D. HCl

WAEC Chemistry 2025 Study Tips

Understand the Concepts: Memorizing is not enough. Know the why behind chemical reactions.

Use Past Questions: Practice at least 5 years’ worth of WAEC Chemistry papers.

Master Calculations: Topics like mole concept, gas laws, and stoichiometry are scoring areas.

Study Practicals Separately: Although not in this post, don’t ignore practical-based questions in your revision.

Manage Exam Time Well: Attempt the OBJ quickly and leave more time for structured calculations.

When is WAEC 2025 Chemistry Exam?

The WAEC Chemistry exam for 2025 will be held during the May/June examination period. The exact date will be confirmed in the official WAEC timetable.

Stay Updated

We will update this page with the real WAEC 2025 Chemistry OBJ and Theory questions and answers a few hours before the exam.

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Final Words

Passing WAEC Chemistry is achievable with the right mindset and preparation. Focus on understanding principles, practice regularly, and avoid last-minute cramming. Stay tuned to this page for real-time WAEC 2025 Chemistry expo updates, verified questions, and free answers.

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