PassSpark

JAMB UTME Chemistry 2018 past questions and answers

This 2018 JAMB UTME Chemistry set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2018 set with instant marking.

Practise the full 2018 setTimed exam mode

Sample JAMB UTME Chemistry 2018 questions

1. A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass. What is its empirical formula?
  1. CHO
  2. C2H4O2
  3. CH2O
  4. CH4O

Answer: C. CH2O

For 100 g, the mole ratio C:H:O is approximately 3.33:6.7:3.33, which simplifies to 1:2:1.

2. A fixed mass of gas occupies 250 cm3 at 100 kPa. If its temperature remains constant and the pressure is raised to 200 kPa, what volume will it occupy?
  1. 125 cm3
  2. 200 cm3
  3. 300 cm3
  4. 500 cm3

Answer: A. 125 cm3

By Boyle's law, P1V1 = P2V2, so V2 = (100 x 250)/200 = 125 cm3.

3. What is the electronic configuration of a neutral calcium atom with atomic number 20?
  1. 2, 8, 10
  2. 2, 6, 8, 4
  3. 2, 8, 9, 1
  4. 2, 8, 8, 2

Answer: D. 2, 8, 8, 2

The 20 electrons fill the shells in the order 2, 8, 8, 2.

4. Which pair of elements is most likely to form an ionic compound by electron transfer?
  1. Carbon and hydrogen
  2. Magnesium and oxygen
  3. Nitrogen and oxygen
  4. Chlorine and bromine

Answer: B. Magnesium and oxygen

Magnesium transfers two electrons to oxygen, forming Mg2+ and O2- ions.

5. According to the kinetic theory, the pressure exerted by a gas on its container is mainly due to the
  1. collisions of gas particles with the container walls
  2. attraction between gas particles and the walls
  3. weight of gas particles at the bottom of the container
  4. chemical reaction of gas particles with the container

Answer: A. collisions of gas particles with the container walls

Gas pressure results from momentum transferred when rapidly moving particles collide with the container walls.

More JAMB UTME Chemistry years

20262025202420232022202120202019201720162015201420132012201120102009200820072006200520042003200220012000

All JAMB UTME Chemistry years · JAMB UTME subjects

PassSpark questions are original practice questions written to each exam's syllabus and format, in the style of past questions. They are not official past papers and are not affiliated with JAMB, WAEC, NECO, any university or any exam body.