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WAEC WASSCE 2022

WAEC Chemistry 2022 past questions

5 objective questions from the 2022 WAEC Chemistry paper. Answer each one, then reveal the answer and explanation.

All WAEC Chemistry past questions

  1. Question 1

    Electronic configuration

    What is the electronic configuration of chlorine (atomic number 17)?

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

    Answer: A, 2, 8, 7

    Fill the shells in order, 2 then 8 then 8: chlorine has 17 electrons, arranged 2, 8, 7.

  2. Question 2

    Chemical symbols

    What is the chemical symbol of magnesium?

    1. Option A: Mg
    2. Option B: Mn
    3. Option C: Ma
    4. Option D: M
    Show the answer to question 2

    Answer: A, Mg

    Magnesium is Mg; Mn is manganese.

  3. Question 3

    Periodic table

    In which group of the periodic table is beryllium found?

    1. Option A: Group V
    2. Option B: Group VI
    3. Option C: Group VII
    4. Option D: Group II
    Show the answer to question 3

    Answer: D, Group II

    Beryllium (configuration 2, 2) is in Group II.

  4. Question 4

    Atomic structure

    An atom of beryllium has atomic number 4 and mass number 9. How many neutrons are in its nucleus?

    1. Option A: 5
    2. Option B: 9
    3. Option C: 4
    4. Option D: 13
    Show the answer to question 4

    Answer: A, 5

    Neutrons = mass number − atomic number = 9 − 4 = 5.

  5. Question 5

    Organic chemistry

    What is the molecular formula of ethene?

    1. Option A: C₂H₆
    2. Option B: C₂H₂
    3. Option C: C₂H₄
    4. Option D: C₂H₅
    Show the answer to question 5

    Answer: C, C₂H₄

    Alkenes follow CₙH₂ₙ, so ethene with 2 carbon atoms is C₂H₄.

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