WAEC Likely 2027 — Chemistry questions

50 likely Chemistry questions for the 2027 WAEC examination, written from the official syllabus and recurring past-question patterns, each with the correct answer and a short explanation. The first 6 are free to read — full access (₦2,990 once) unlocks all 50.

Unlock all 50 for ₦2,990 Practise Chemistry in CBT mode Chemistry syllabus

1. Which sequence of processes is most suitable for obtaining pure sodium chloride crystals from a mixture of sodium chloride and sand?

Separation Techniques

2. An ion, X²⁻, has a mass number of 32 and an atomic number of 16. How many protons, neutrons and electrons does it contain respectively?

Atomic Structure

3. Which of the following Period 3 elements has the largest atomic radius?

Periodicity

4. The unusually high boiling point of water compared with hydrogen sulphide is mainly due to

Chemical Bonding

5. What volume of carbon dioxide at STP is produced by the complete decomposition of 10.0 g of calcium carbonate? [Ca = 40, C = 12, O = 16; molar gas volume at STP = 22.4 dm³]

Mole Concept and Stoichiometry

6. A fixed mass of gas occupies 200 cm³ at 27°C. What volume will it occupy at 127°C if the pressure remains constant?

Gas Laws

These are AI predictions for revision, not leaked or official exam questions.