Scoring high in JAMB chemistry requires a strategic approach.
Many candidates struggle with chemistry because they do not focus on the most repeated topics and past JAMB chemistry questions.
However, a detailed understanding of the JAMB syllabus, key topics, and commonly tested questions makes preparation easier and more effective.
This guide provides JAMB top repeated topics and questions for chemistry, strategies for scoring high, and frequently asked questions (FAQs) to help candidates perform excellently in the 2024/2025 JAMB examination.
Do JAMB Repeat Chemistry Questions?
Yes, JAMB repeats chemistry questions from previous years.
Many of these questions remain the same, while others appear with slight modifications.
By studying past questions, candidates can identify patterns in question types and prepare effectively.
Commonly repeated areas include:
1. Chemical bonding and periodicity
2. Acids, bases, and salts
3. Organic chemistry reactions
4. Redox reactions and electrolysis
Practicing past JAMB chemistry questions improves accuracy and speed, making it easier to recognize familiar question structures.
What Are the Most Asked Questions in Chemistry?
JAMB chemistry questions focus on fundamental principles.
Below are some of the most commonly asked questions:
1. Which of these is a strong acid?
A. CH₃COOH
B. H₂SO₄
C. NH₃
D. H₂O
2. What is the electronic configuration of magnesium?
A. 1s² 2s² 2p⁶ 3s²
B. 1s² 2s² 2p⁶ 3s¹
C. 1s² 2s² 3s²
D. 1s² 2p⁶ 3s²
3. Which gas is released when sodium reacts with water?
A. Oxygen
B. Hydrogen
C. Carbon dioxide
D. Nitrogen
4. What is the oxidation state of sulfur in H₂SO₄?
A. +2
B. +4
C. +6
D. -2
5. Which process is used to separate a mixture of salt and water?
A. Filtration
B. Evaporation
C. Distillation
D. Sublimation
By focusing on frequently asked JAMB chemistry questions, candidates improve their chances of scoring higher in the exam.
How to Score High in JAMB Chemistry?
A high score in JAMB chemistry requires effective preparation.
Below are some proven strategies:
1. Understand the JAMB Chemistry Syllabus
The JAMB syllabus outlines all examinable topics. Focusing on these areas ensures a well-structured study plan.
2. Practice Past Questions Regularly
Since JAMB repeats chemistry questions, solving past papers improves familiarity with common question patterns.
3. Master Chemical Equations and Reactions
Many JAMB chemistry questions require knowledge of balanced equations, oxidation states, and reaction types.
Memorizing key reactions boosts problem-solving efficiency.
4. Use Standard Chemistry Textbooks
Recommended books include:
New School Chemistry by Osei Yaw Ababio
Chemistry for Senior Secondary Schools by Odesina & Olabintan
Essential Chemistry for JAMB and UTME
These books provide detailed explanations of chemistry concepts frequently tested in JAMB.
5. Take Timed Practice Tests
Practicing with JAMB CBT software improves speed and accuracy, ensuring better time management during the exam.
6. Focus on Calculations and Theoretical Questions
JAMB chemistry has a mix of theory-based and calculation-based questions.
Topics such as mole concept, gas laws, and stoichiometry require a solid understanding of formulas.
7. Revise Weak Areas and Avoid Guessing
Identifying weak topics and improving on them boosts confidence and accuracy in the actual exam.
Avoid guesswork and focus on understanding concepts.
What Are the Most Important Topics in Chemistry?
Several topics in chemistry are tested frequently in JAMB exams.
Some of the most important chemistry topics include:
1. Atomic Structure and Chemical Bonding
2. Electronic configuration
3. Types of bonding (ionic, covalent, metallic)
4. Properties of elements in the periodic table
5. Acids, Bases, and Salts
6. pH scale and indicators
7. Neutralization reactions
8. Preparation of salts
9. Stoichiometry and Mole Concept
10. Avogadro’s law
11. Empirical and molecular formula calculations
12. Limiting reagent problems
13. Chemical Kinetics and Equilibrium
14. Factors affecting reaction rates
15. Le Chatelier’s Principle
16. Catalysis
17. Electrolysis and Redox Reactions
18. Oxidation-reduction reactions
19. Electrochemical cells
20. Applications of electrolysis
21. Organic Chemistry
22. Alkanes, alkenes, and alkynes
23. Functional groups and reactions
24. Petroleum and its fractions
Studying these topics increases the chances of answering JAMB chemistry questions correctly.
What Are the Most Repeated Topics in JAMB Chemistry?
JAMB frequently tests the following topics:
1. Periodic Table and Periodicity
2. Chemical Equilibrium and Thermodynamics
3. Electrolysis and Faraday’s Laws
4. Organic Chemistry and Hydrocarbons
5. Gas Laws and Their Applications
6. Acids, Bases, and Salts
7. Stoichiometry and Chemical Calculations
8. Redox Reactions and Oxidation Numbers
These topics appear almost every year in JAMB chemistry.
Focusing on them improves overall performance.
What is the Pass Mark for JAMB?
JAMB does not have a fixed pass mark.
However, universities and polytechnics set cut-off marks based on:
1. Competition for admission
2. Course requirements
3. Institution policies
Generally:
Federal universities require 180 – 250+
State universities may accept 150 – 200+
Polytechnics and colleges often set 100 – 150
To secure admission into competitive courses like medicine, pharmacy, and engineering, candidates should aim for 250 and above.
JAMB Top Repeated Topics and Questions for Chemistry 2025
Below are examples of JAMB top repeated chemistry questions:
1. Which gas is collected over water because it is insoluble?
A. Carbon dioxide
B. Oxygen
C. Hydrogen
D. Chlorine
2. What is the oxidation state of chlorine in NaClO₃?
A. +1
B. +3
C. +5
D. +7
3. Which separation technique is used for crude oil?
A. Chromatography
B. Fractional distillation
C. Filtration
D. Sublimation
4. What is the general formula for alkanes?
A. CₙH₂ₙ
B. CₙH₂ₙ₊₂
C. CₙH₂ₙ₋₂
D. CₙH₂ₙ₊₁OH
5. Which law states that pressure is inversely proportional to volume at constant temperature?
A. Boyle’s Law
B. Charles’ Law
C. Graham’s Law
D. Avogadro’s Law
Practicing past JAMB chemistry questions ensures better preparation.
Conclusion
Preparing for JAMB chemistry requires mastering key topics, practicing past questions, and improving problem-solving skills.
Understanding JAMB top repeated topics and questions for chemistry helps candidates focus on high-yield areas.
With consistent practice and the right strategy, achieving a high JAMB chemistry score in 2024/2025 is possible.
By following this guide, candidates increase their chances of success in JAMB!