WAEC Chemistry 2024 past questions

Checked by the Skolra question team · Last updated 15 October 2026

Ten questions from the 2024 WAEC Chemistry paper, with answers and explanations. We hold 55 questions from this paper, and the Skolra app has all of them.

WAEC Chemistry 2024 questions and answers

1. 1.

   Which of the following substances has the lowest boiling point?

   1. A
      Ammonia (NH₃)
   2. B
      Methane (CH₄)
   3. C
      Water (H₂O)
   4. D
      Hydrogen (H₂)
      Correct
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   Answer: D

   Hydrogen has lowest boiling point due to weakest intermolecular van der Waals forces.
2. 2.

   How many isomers can be formed from a compound with molecular formula C$_5$H$_{12}$ ?

   1. A
      5 isomers
   2. B
      3 isomers
      Correct
   3. C
      2 isomers
   4. D
      4 isomers
   Show answerHide answer

   Answer: B

   Pentane has three structural isomers with different molecular arrangements and properties.
3. 3.

   Aluminium is suitable for making alloys for aircraft construction because it

   1. A
      Has high density and high melting point
   2. B
      Is highly magnetic and corrosion-resistant
   3. C
      Has low density and high strength
      Correct
   4. D
      Is easily recyclable and inexpensive
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   Answer: C

   Aluminum alloys provide low weight for fuel efficiency and high strength for aircraft construction.
4. 4.

   Which of the following statements about ammonium salt is correct? It

   1. A
      Conducts electricity when molten but not in solution
   2. B
      Releases ammonia gas when heated with a strong base
      Correct
   3. C
      Dissolves in water to give an acidic solution
   4. D
      Forms colored complexes in water
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   Answer: B

   Ammonium salts release ammonia when heated with strong base like sodium hydroxide.
5. 5.

   The metallic bonding in aluminium is strong because of large number of

   1. A
      Covalent electrons
   2. B
      Delocalized electrons
      Correct
   3. C
      Localized electrons
   4. D
      Ionic charges
   Show answerHide answer

   Answer: B

   Metallic bonding in aluminum is strong due to delocalized electrons moving freely through structure.
6. 6.

   The most important ore of aluminium is

   1. A
      Corundum
   2. B
      Cryolite
   3. C
      Bauxite
      Correct
   4. D
      Feldspar
   Show answerHide answer

   Answer: C

   Bauxite is most important aluminum ore used in Bayer process for commercial extraction.
7. 7.

   In ethanol, the attractive forces between adjacent molecules are

   1. A
      Covalent bonds
   2. B
      Hydrogen bonds
      Correct
   3. C
      Ionic attractions
   4. D
      Van der Waals forces only
   Show answerHide answer

   Answer: B

   Ethanol molecules form hydrogen bonds between polar -OH groups, stronger than van der Waals.
8. 8.

   $_8$X$^{2-}$ and $_{10}$Y are

   1. A
      Isotopes
   2. B
      Isoelectronic
      Correct
   3. C
      Isomers
   4. D
      Allotropes
   Show answerHide answer

   Answer: B

   Both species have same electron count and configuration, making them isoelectronic.
9. 9.

   The electron configuration of $_{29}$ Cu is

   1. A
      1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹¹
   2. B
      1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹
   3. C
      1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹
      Correct
   4. D
      1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁸
   Show answerHide answer

   Answer: C

   Copper has electron configuration with filled d-subshell providing extra stability than expected.
10. 10.

    The branch of science that deals with the nature and properties of substances and how one substance can be converted to another is known as

    1. A
       Biology
    2. B
       Geology
    3. C
       Physics
    4. D
       Chemistry
       Correct
    Show answerHide answer

    Answer: D

    Chemistry is the science of nature and properties of substances and their transformations.

The questions come from past JAMB, WAEC and NECO papers. We use software to help write the answer options and explanations, and every answer is checked twice before it goes on the site. How we check

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Practise all 55 questions we hold from the 2024 paper, on a timed CBT screen

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