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JAMB UTME Chemistry 2017 past questions and answers

This 2017 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 2017 set with instant marking.

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Sample JAMB UTME Chemistry 2017 questions

1. A mixture contains sand and common salt. Which sequence will separate the two substances and recover both?
  1. Evaporate the dry mixture, then filter it
  2. Use a separating funnel, then distil the residue
  3. Dissolve in water, filter, then evaporate the filtrate
  4. Sublime the mixture, then condense the vapour

Answer: C. Dissolve in water, filter, then evaporate the filtrate

Salt dissolves in water while sand does not, so filtration retains the sand and evaporation recovers the salt.

2. Which feature of a fractionating column allows two miscible liquids with nearby boiling points to be separated more effectively?
  1. It provides repeated vaporisation and condensation along the column
  2. It converts the liquids into insoluble solids
  3. It reduces the atmospheric pressure to zero
  4. It chemically reacts with the liquid of lower boiling point

Answer: A. It provides repeated vaporisation and condensation along the column

Repeated condensation and vaporisation enrich the vapour in the more volatile component.

3. According to Avogadro's law, equal volumes of gases at the same temperature and pressure contain equal numbers of
  1. atoms, regardless of molecular formula
  2. grams of gas
  3. moles of atoms only
  4. molecules

Answer: D. molecules

Avogadro's law states that equal gas volumes at the same temperature and pressure contain equal numbers of molecules.

4. Element X contains 75% of the isotope X-35 and 25% of X-37. What is its relative atomic mass?
  1. 35.0
  2. 35.5
  3. 36.0
  4. 37.0

Answer: B. 35.5

The weighted mean is (0.75 x 35) + (0.25 x 37) = 35.5.

5. How many neutrons are present in a neutral atom of magnesium-24, given that magnesium has atomic number 12?
  1. 12
  2. 24
  3. 36
  4. 10

Answer: A. 12

The number of neutrons is the mass number minus the atomic number, so 24 - 12 = 12.

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