PassSpark

JAMB UTME Chemistry 2003 past questions and answers

This 2003 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 2003 set with instant marking.

Practise the full 2003 setTimed exam mode

Sample JAMB UTME Chemistry 2003 questions

1. A mixture contains sand and water. Which method is most suitable for separating the sand from the water?
  1. Filtration
  2. Fractional distillation
  3. Paper chromatography
  4. Sublimation

Answer: A. Filtration

Sand is insoluble in water and is retained by filter paper while the water passes through.

2. In a paper chromatogram, a dye spot travels 4.2 cm while the solvent front travels 7.0 cm; what is the Rf value of the dye?
  1. 0.42
  2. 0.60
  3. 1.67
  4. 2.80

Answer: B. 0.60

The Rf value is the distance travelled by the dye divided by that travelled by the solvent, giving 4.2/7.0 = 0.60.

3. A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass; what is its empirical formula?
  1. CH2O2
  2. C2H4O
  3. CH2O
  4. C2H2O2

Answer: C. CH2O

Dividing the percentage masses by the relative atomic masses gives the simplest mole ratio C:H:O of 1:2:1.

4. What is the number of molecules in 11.2 dm3 of an ideal gas at s.t.p., where 1 mole occupies 22.4 dm3?
  1. 6.02 x 10^23
  2. 1.20 x 10^24
  3. 1.50 x 10^23
  4. 3.01 x 10^23

Answer: D. 3.01 x 10^23

The gas amount is 11.2/22.4 = 0.5 mol, which contains 0.5 x 6.02 x 10^23 = 3.01 x 10^23 molecules.

5. The electron arrangement of a sodium atom is 2,8,1; how many electrons does it have in its outermost shell?
  1. 1
  2. 2
  3. 8
  4. 11

Answer: A. 1

The last number in the arrangement 2,8,1 is the number of outer-shell electrons.

More JAMB UTME Chemistry years

20262025202420232022202120202019201820172016201520142013201220112010200920082007200620052004200220012000

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.