1. An ion X²⁻ contains 18 electrons and 16 neutrons. What is the mass number of X?
Atomic Structure- A.30
- B.32
- C.34
- D.36
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JAMB Likely Questions 2027 — Chemistry
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.
2. Which of the following Period 3 elements has the highest electronegativity?
Periodic Chemistry- A.Sodium
- B.Magnesium
- C.Sulphur
- D.Chlorine
3. The bond formed when an ammonia molecule donates its lone pair of electrons to a hydrogen ion is initially described as
Chemical Bonding- A.an ionic bond
- B.a hydrogen bond
- C.a coordinate covalent bond
- D.a metallic bond
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- A.Increasing pressure and decreasing temperature
- B.Decreasing pressure and increasing temperature
- C.Increasing pressure and increasing temperature
- D.Decreasing pressure and decreasing temperature
5. What is the pH of a 0.001 mol dm⁻³ solution of hydrochloric acid, assuming complete ionisation?
Acids, Bases and Salts- A.1
- B.2
- C.11
- D.3
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- A.1.12 dm³
- B.2.24 dm³
- C.4.48 dm³
- D.22.40 dm³
These are AI predictions for revision, not leaked or official exam questions.