Skip to content

WAEC WASSCE 2024

WAEC Chemistry 2024 past questions

5 objective questions from the 2024 WAEC Chemistry paper. Answer each one, then reveal the answer and explanation.

All WAEC Chemistry past questions

  1. Question 1

    Organic chemistry

    What is the molecular formula of butene?

    1. Option A: C₄H₁₀
    2. Option B: C₄H₆
    3. Option C: C₄H₈
    4. Option D: C₄H₉
    Show the answer to question 1

    Answer: C, C₄H₈

    Alkenes follow CₙH₂ₙ, so butene with 4 carbon atoms is C₄H₈.

  2. Question 2

    Acids, bases and salts

    Which description fits a solution whose pH is 2?

    1. Option A: strongly acidic
    2. Option B: weakly acidic
    3. Option C: neutral
    4. Option D: strongly alkaline
    Show the answer to question 2

    Answer: A, strongly acidic

    The lower the pH below 7, the stronger the acid.

  3. Question 3

    Gas laws

    A fixed mass of gas occupies 540 cm³ at a pressure of 1 atm. What volume will it occupy at 4 atm if the temperature stays constant?

    1. Option A: 2160 cm³
    2. Option B: 540 cm³
    3. Option C: 270 cm³
    4. Option D: 135 cm³
    Show the answer to question 3

    Answer: D, 135 cm³

    By Boyle's law, P₁V₁ = P₂V₂, so V₂ = 1 × 540 ÷ 4 = 135 cm³.

  4. Question 4

    Atomic structure

    An atom of neon has atomic number 10 and mass number 20. How many neutrons are in its nucleus?

    1. Option A: 20
    2. Option B: 10
    3. Option C: 30
    4. Option D: 11
    Show the answer to question 4

    Answer: B, 10

    Neutrons = mass number − atomic number = 20 − 10 = 10.

  5. Question 5

    Electronic configuration

    What is the electronic configuration of fluorine (atomic number 9)?

    1. Option A: 2, 6
    2. Option B: 2, 8
    3. Option C: 2, 7
    4. Option D: 2, 8, 1
    Show the answer to question 5

    Answer: C, 2, 7

    Fill the shells in order, 2 then 8 then 8: fluorine has 9 electrons, arranged 2, 7.

Practise WAEC Chemistry on SchoolEasy CBT

In SchoolEasy, students answer timed questions on screen, see an explanation for every answer, and track their progress topic by topic. Teachers turn past questions into class tests that mark themselves.

Practise in the appRequest a demo for your school

School management made effortless.

We strive to build the best school management software for schools from all over the world.

Available soon on all digital platforms

Download on theApp StoreGet it onGoogle Play