JAMB Likely 2027 — Chemistry questions

50 likely Chemistry questions for the 2027 JAMB 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. An ion X²⁻ contains 18 electrons and 16 neutrons. What is the mass number of X?

Atomic Structure

2. Which of the following Period 3 elements has the highest electronegativity?

Periodic Chemistry

3. The bond formed when an ammonia molecule donates its lone pair of electrons to a hydrogen ion is initially described as

Chemical Bonding

4. For the equilibrium N₂(g) + 3H₂(g) ⇌ 2NH₃(g), ΔH < 0, which combination of changes favours a higher equilibrium yield of ammonia?

Chemical Equilibrium

5. What is the pH of a 0.001 mol dm⁻³ solution of hydrochloric acid, assuming complete ionisation?

Acids, Bases and Salts

6. What volume will 2.8 g of nitrogen gas occupy at s.t.p.? [N = 14; molar volume of a gas at s.t.p. = 22.4 dm³]

Gas Laws and Mole Concept

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