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JAMB Chemistry past questions.

1,430 real Joint Admissions and Matriculation Board (UTME) questions from 1997 to 2026, every one with a worked solution. Practise them timed, on the web, on Android, or offline on desktop.

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Questions held
1,430
Years covered
30
Questions per paper
40
Time allowed
45 min
Try 5

Sample Chemistry questions, answered.

Taken straight from the papers below — one from each of the most recent years, with the answer marked and the reasoning written out.

JAMB Chemistry 2026 · Question 1
The electron configuration of two elements with similar chemical properties are represented by
  1. 1s²2s²2p⁵ and 1s²2s²2p
  2. 1s²2s²2p⁴ and 1s²2s²2p⁶3s¹
  3. 1s²2s²2p⁶3s¹ and 1s²2s¹ — correct answer
  4. 1s²2s²2p⁴ and 1s²2s¹
Worked solution
1s²2s²2p⁶3s¹ = Na (2,8,1) and 1s²2s¹ = Li (2,1) Both Li and Na have ONE electron in their outermost shell (Group 1 alkali metals), giving them similar chemical properties. Answer: C
JAMB Chemistry 2025 · Question 1
The molecule with the highest number of lone pair of electrons is
  1. H₂O
  2. NH₃
  3. CH₄
  4. CO₂ — correct answer
Worked solution
Counting lone pairs per molecule: CO₂ has 4 lone pairs (2 on each O), H₂O has 2 lone pairs, NH₃ has 1 lone pair, CH₄ has 0 lone pairs. CO₂ has the highest number of lone pairs.
JAMB Chemistry 2024 · Question 1
At a given temperature and pressure, a gas X diffuses twice as fast as gas Y. It follows that
  1. Gas Y is two times as heavy as Gas X
  2. Gas Y is four times as heavy as Gas X — correct answer
  3. Gas Y is monoatomic
  4. Gas X is diatomic
Worked solution
By Graham's Law of diffusion: rate of diffusion is inversely proportional to the square root of molar mass. Rate_X/Rate_Y = √(M_Y/M_X). Given Rate_X = 2 × Rate_Y: 2 = √(M_Y/M_X). Squaring both sides: 4 = M_Y/M_X. Therefore M_Y = 4 × M_X. Gas Y is four times as heavy as Gas X.
JAMB Chemistry 2023 · Question 1
What happens to the position of equilibrium, if a reversible exothermic reaction is subjected to a decrease in temperature?
  1. The position of equilibrium shifts to the left
  2. The position of equilibrium shifts to the right. — correct answer
  3. The position of equilibrium remains unchanged
  4. The reaction stops
Worked solution
For a reversible exothermic reaction, the forward reaction releases heat. By Le Chatelier's principle, decreasing temperature removes heat from the system. The equilibrium shifts in the direction that produces more heat, which is the forward (exothermic) direction. The equilibrium position therefore shifts to the right, increasing the yield of products.
JAMB Chemistry 2022 · Question 1
The sub-atomic particles located in the nucleus of an atom are?
  1. neutron and proton — correct answer
  2. proton and electron
  3. proton and ions
  4. neutron and electron
Worked solution
The nucleus of an atom contains two types of subatomic particles: protons (positively charged) and neutrons (no charge). Electrons are negatively charged particles found outside the nucleus, orbiting in energy shells. Ions are not subatomic particles but atoms that have gained or lost electrons.
Every paper we hold

JAMB Chemistry, year by year.

2026
40 questions
2025
40 questions
2024
40 questions
2023
40 questions
2022
40 questions
2021
40 questions
2020
40 questions
2019
50 questions
2018
50 questions
2017
50 questions
2016
50 questions
2015
50 questions
2014
50 questions
2013
50 questions
2012
50 questions
2011
50 questions
2010
50 questions
2009
50 questions
2008
50 questions
2007
50 questions
2006
50 questions
2005
50 questions
2004
50 questions
2003
50 questions
2002
50 questions
2001
50 questions
2000
50 questions
1999
50 questions
1998
50 questions
1997
50 questions
Before you sit it

How JAMB Chemistry is set.

Joint Admissions and Matriculation Board (UTME) sets 40 questions in Chemistry, answered in 45 minutes — about 68 seconds a question. Practising against that clock is the part most candidates skip, and it is the part that costs marks.

We hold 1,430 published Chemistry questions spanning 1997 to 2026. You can practise any single year’s paper, or sit a full timed mock that mirrors the real interface — the navigator, the flags and the auto-submit included.

Every question you get wrong comes back the next day, then at longer gaps until it sticks, and your home page leads with your weakest subjects.

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