Free JAMB UTME Chemistry Exam Questions and Answers
JAMB UTME Chemistry is the Chemistry paper of the Unified Tertiary Matriculation Examination (UTME), set by Nigeria's Joint Admissions and Matriculation Board for entry to universities, polytechnics and colleges of education. The UTME is a computer-based multiple-choice test. The questions here are past JAMB Chemistry questions from 1983 to 2015, with the answer and, where the source gave one, an explanation.
If you searched for JAMB UTME Chemistry dumps, an ExamTopics discussion or a free PDF, this is the question bank for it: practice questions with verified answers and explanations, a timed practice test and updates whenever JAMB changes the exam.
Last updated: October 13, 2026
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Question #1
Which of these require crystallization most?
Correct answer: A
Explanation
Crystallization is required the most in industries where the purity of their products is important e.g in the manufacture of drugs and in sugar production. Options B,C and D do not undergo crystallization
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Question #2
Iron is often galvanized in order to
Correct answer: C
Explanation
Iron is galvanized with zinc covering to protect it against corrosion. Option A, B, D are the main reasons iron is galvanized
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Question #3
In the industrial production of H₂ is removed by (solution)
Correct answer: A
Explanation
Washing under pressure is an action in the industrial production of H. Options B,C,D will not yield Co and H
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Question #4
The gas that is most useful in protecting humans against solar marathon is
Correct answer: B
Explanation
The ozone layer or ozone shield refers to a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation. It contains high concentrations of ozone (O3) relative to other parts of the atmosphere, although still very small relative to other gases in the stratosphere
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Question #5
Vulcanization involve the removal of
Correct answer: C
Explanation
Vulcanizer is the removal of double bend in a chemical reaction. Option A,B,D can not be removed by vulcanizer
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Question #6
The acid in electrolysis of water is dilute
Correct answer: C
Explanation
HeSO4 is the acid used in the electrolysis of water. Option A,B,D are concentrated acid and they will react with the water
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Question #7
A small quantity of solid ammonium chloride (NH4Cl) texted gently in a test tube, the solid gradually disappear produce two gases. Later, a white cloudy deposit was absence on the cooler part of the test tube. The ammonium chloride is to have undergo
Correct answer: B
Explanation
Sublimation is the transformation of solid gaseous state without passing through the liquid state. Options A,C,D do not show case these character of sublimation as they do not bye pass states. They are in a particular order
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Question #8
When salt loses its water of crystallization to the atmosphere on exposure, the process is said to be
Correct answer: A
Explanation
Efflorescence is a process of long exposure to the atmosphere which favors salt loss of water. Options B, C, D are not related to loss of water
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Question #9
Atomicity of ozone is
Correct answer: C
Explanation
Ozone means Oz as the atomicity is 3. Option A,B,D cannot give ozone because their atomicity is not 3
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Question #10
Which of the noble gases has the greatest ionization energy
Correct answer: A
Explanation
Helium has the greatest ionization energy because they are less stable. Options B,C,D have low ionization energy because one more stable and do not react easily
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