JAMB 2025 Chemistry Past Questions and Answers PDF Download

JAMB 2025 Chemistry Past Questions and Answers: Are you preparing for the JAMB 2025/2026 UTME? One of the smartest ways to boost your score is by studying JAMB past questions and answers. These questions don’t just test your knowledge, they reveal the examiners’ way of setting questions, repeated topics, and give you a real feel of what to expect in the exam hall. if you want to study Medicine, Engineering, Law, or any other course, solving past questions is your secret weapon to scoring 300+

JAMB 2025 Chemistry Past Questions and Answers PDF Download

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Why You Should Use JAMB Chemistry Past Questions and Answers

1. Benefits of past questions for revision
2. Using JAMB Past question will help you to Understanding JAMB question patterns
3. JAMB Past Questions will Boosting confidence and earning speed

How to Use JAMB Chemistry Past Questions and Answers

• Create a study plan and make sure u follow the time table
• Make use of JAMB syllabus to Cross-check
• Practice with answers and explanations

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JAMB Chemistry Practice Questions and Answers (2025)

Below are  20 JAMB Practice Questions and Answers for the 2025 UTME Examination;

1. The atomic number of an element is the number of:
A. Neutrons in the nucleus
B. Protons in the nucleus
C. Electrons in the nucleus
D. Nucleons in the atom
✅ Answer: B. Protons in the nucleus

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

3. Which gas is evolved when metals react with acids?
A. Oxygen
B. Hydrogen
C. Chlorine
D. Carbon dioxide
✅ Answer: B. Hydrogen

4. Which of these is not a chemical change?
A. Burning of candle
B. Rusting of iron
C. Melting of ice
D. Cooking of food
✅ Answer: C. Melting of ice

5. The bond formed between two non-metals is:
A. Ionic
B. Electrovalent
C. Covalent
D. Metallic
✅ Answer: C. Covalent

6. The number of electrons in the outermost shell of magnesium is:
A. 1
B. 2
C. 3
D. 4
✅ Answer: B. 2

7. Which of the following is an endothermic process?
A. Condensation
B. Melting of ice
C. Freezing
D. Combustion
✅ Answer: B. Melting of ice

8. What is the pH of a neutral solution?
A. 1
B. 7
C. 10
D. 14
✅ Answer: B. 7

9. Which of the following is a strong acid?
A. H₂CO₃
B. CH₃COOH
C. HCl
D. H₂S
✅ Answer: C. HCl

10. The process of separating a liquid from a solution is known as:
A. Crystallization
B. Decantation
C. Distillation
D. Filtration
✅ Answer: C. Distillation

11. The chemical formula of calcium trioxocarbonate (IV) is:
A. CaCO₃
B. Ca(NO₃)₂
C. CaSO₄
D. CaCl₂
✅ Answer: A. CaCO₃

12. What is the oxidation number of sulfur in H₂SO₄?
A. +4
B. +6
C. -2
D. 0
✅ Answer: B. +6

13. Which of these is used as a drying agent?
A. HCl
B. H₂SO₄
C. NH₃
D. NaCl
✅ Answer: B. H₂SO₄

14. The periodic table is arranged in order of increasing:
A. Atomic size
B. Atomic mass
C. Atomic number
D. Molar mass
✅ Answer: C. Atomic number

15. An amphoteric oxide reacts with both:
A. Bases only
B. Acids only
C. Acids and bases
D. Salts
✅ Answer: C. Acids and bases

16. The apparatus used to measure temperature is the:
A. Hygrometer
B. Barometer
C. Thermometer
D. Manometer
✅ Answer: C. Thermometer

17. Which of the following is a compound?
A. Air
B. Salt
C. Iron
D. Oxygen
✅ Answer: B. Salt

18. Which method is used to separate a mixture of salt and sand?
A. Decantation
B. Chromatography
C. Filtration
D. Sublimation
✅ Answer: C. Filtration

19. The valency of nitrogen in NH₃ is:
A. 1
B. 2
C. 3
D. 4
✅ Answer: C. 3

20. Which of the following compounds has a giant covalent structure?
A. H₂O
B. CO₂
C. Diamond
D. CH₄
✅ Answer: C. Diamond

Conclusion

We have gotten to the End of this post, Don’t leave your JAMB success to chance practice smart with past questions and answers! Every top scorer you’ve heard about didn’t just read hard; they studied right. Download the free JAMB past questions now and start practicing like a pro. Your dream score is one step closer