JAMB Past Questions and Answers on chemistry PDF for 2023

JAMB Past Questions and Answers on chemistry PDF for 2023 UTME. Below is how to get jamb past questions for chemistry and stips  on How to pass JAMB successfully in 2023 UTME.

Download Free JAMB Past Questions and Answers on chemistry


The Joint Admission and Matriculation Board (JAMB) has its patterns of asking questions in chemistry and understanding the patterns and the key topics in chemistry would help you perform well.

JAMB Past Questions and Answers on chemistry

This new process has helped in reducing malpractice, saving time and cost-effective means of making UTME a fair playing ground for all candidates. In the time past, the rate of malpractice was high but this has reduced via the introduction of CBT.

However, many students haven’t been able to integrate well with JAMB CBT and this has led to failure or underperformance of many students. For any student to pass JAMB successfully, he/she must master the act of taking CBT which is quite different from paper based test. Mastering this act will enable you to pass JAMB successfully.


Sample JAMB Past Questions and Answers on chemistry

Note: The questions and answers below are for practice. Use them to prepare for JAMB mock and JAMB examination.

1. A mixture of iodine and sulphur crystals can be separated by treatment with
A. water of filter off sulphur
B. carbon (1V) sulphide to filter off iodine
C. ethanoic acid to filter off sulphur
D. methanol to filter off iodine

2. Sieving is a technique used to separate mixtures containing solid particles of
A. small sizes
B. large sizes
C. different sizes
D. the same size

3. Which of the compounds is composed of Al, Si, O and H?
A. Epson salt
B. Limestone
C. Clay
D. Urea

4. 50cm3 of carbon (11) oxide was exploded with 150cm3 of air containing 20% oxygen by volume, which of the reactants was in excess?
A. Carbon (11) oxide
B. Carbon (1V) oxide
C. Oxygen
D. Nitrogen

5. How many moles of HCl will be required to react with potassium heptaoxodichromate (V1) to produce 3 moles of chlorine?
A. 14
B. 12
C. 11
D. 10

6. The ratio of the initial to the final pressure of a given mass of gas is 1:1:5. Calculate the final volume of the gas if the initial volume was 300cm3 at the same temperature.
A. 120 cm3
B. 200 cm3
C. 450 cm3
D. 750 cm3

7. The partial pressure of oxygen in a sample of air is 452mm Hg and the total pressure is 780mmHg. What is the mole fraction of oxygen?
A. 0.203
B. 0.579
C. 2.030
D. 5.790

8. The fundamental difference between the three states of matter is the
A. shape of their particles
B. number of particles in each state
C. shape of the container they occupy
D. degree of movement of their particles

9. Which of the following the following statements is correct about the periodic table?
A. Element in the same period have the same number of valence electrons
B. The valence electrons of the elements in the same period increase progressively across
the period
C. Elements in the same group have the number of electron shells
D. The non-metallic properties of the elements tent to decrease across each period

10. The electron configuration of 22X2+ ion is
A. ls2 2s2 2p6 3s2 3p6 4s2 3d2
B. ls2 2s2 2p6 3s2 3p6 4s2 3d1
C. ls2 2s2 2p6 3s2 3p6
D. ls2 2s2 2p6 3s2 3p6 4p2

11. Which of the following types of bonding does not involves the formation of new substance?
A. Metallic
B. Covalent
C. Co-ordinate
D. Electrovalent

12. The knowledge of half-life can be used to
A. create an element
B. detect an element
C. split an element
D. irradiate an element

13. The shape of CO2H2O and CH4 respectively are
A. bent linear and tetrahedral
B. bent tetrahedral and linear
C. linear bent and tetrahedral
D. tetrahedral, linear and bent.

14. The distance between the nuclei of chlorine atoms in a chlorine molecule is 0.914 nm. The atomic radius of chlorine atom is
A. 0.097 nm
B. 0.914 nm
C. 2.388 nm
D. 2.388 nm

15. The noble gas, argon, is used for
A. electric are welding
B. welding brass
C. underwater welding
D. steal welding

16. A side effect of soft water is that
A. it gives offensive taste
B. excess calcium s precipitate
C. it attacks lead contained in pipes
D. it encourages the growth of bacteria

17 Water molecules can be ligands especially when they are bonded to.
A. alkaline earth metals
B. alkali metals
C. transition metals
D. group V11 elements

18. The air pollutant unknown in nature is

19. 10dm3 of distilled water used to wash 2.0 g of a precipitate of AgCl. If the solubility product of AgCl is 2.0 x10-10 moldm-6, what quantity of silver was lost in the process?
A. 2.029 x10-3 mol dm-3
B. 1.414 x 10-3 mol dm-3
C. 2.029 x 10-5 mol dm-3
D. 1.414 x 10-5 mol dm-3

20. Hydration of ions in solution is associated with
A. absorption of heat
B. reduction of heat
C. conduction of heat
D. liberation of heat

see also: jamb past questions for biology

How to Get JAMB Past Questions and Answers on chemistry

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 Tips How to pass JAMB successfully

This post will show you some study tips that will help you to excel in your academics. Relax and read to the end.

  • Read and re-read what you have learnt. Do not only skim and scan. Sit down and do a thorough studying. People tend to forget up to 80% of what they read in just one day. Reading a course 2 to 4 times is very important for deep and lasting impression.
  • For maximum comprehension, you need not hurry over a text. Be patient while studying, don’t be in a hurry while reading.
  • Assess yourself by asking relevant questions on the topic you have read. Make reference to past question papers to know how the questions look like and what to expect during exam. Digest and answer the questions satisfactorily.
  • Form a study group with friends and try to lecture them on the topic you have studied. it helps your subconscious mind internalize the subject matter. Try to share information, it helps a lot.
  • The study group will help you discover some mistakes you might have been making and they will correct you.
  • After each lecture or study group class, go back and study more.
  • When reading, focus on one course or subject at time for effective understanding.
  • Form a timetable for reading. If you are to read Mathematics today, face it and leave other courses except during exam time.
  • Note, we are unique beings. There is a special time we all like reading, Some like reading in the day while some in the midnight, Understand yours and follow it effectively.
  • While studying, employ the PQ3R method. It is important to studying technique. PQ3R- Preview, Question, Read, Recall, Review.

I can categorically tell you that if you follow all the study tips outlined above, passing your exams will very easy for you.

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