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JAMB UTME 2024

JAMB Chemistry 2024 past questions

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

All JAMB Chemistry past questions

  1. Question 1

    Gas laws

    A fixed mass of gas occupies 120 cm³ at a pressure of 3 atm. What volume will it occupy at 1 atm if the temperature stays constant?

    1. Option A: 40 cm³
    2. Option B: 360 cm³
    3. Option C: 120 cm³
    4. Option D: 720 cm³
    Show the answer to question 1

    Answer: B, 360 cm³

    By Boyle's law, P₁V₁ = P₂V₂, so V₂ = 3 × 120 ÷ 1 = 360 cm³.

  2. Question 2

    Electronic configuration

    What is the electronic configuration of neon (atomic number 10)?

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

    Answer: D, 2, 8

    Fill the shells in order, 2 then 8 then 8: neon has 10 electrons, arranged 2, 8.

  3. Question 3

    Acids, bases and salts

    What is the pH of a neutral solution at 25 °C?

    1. Option A: 0
    2. Option B: 7
    3. Option C: 14
    4. Option D: 1
    Show the answer to question 3

    Answer: B, 7

    A neutral solution has pH 7.

  4. Question 4

    Organic chemistry

    What is the molecular formula of hexane?

    1. Option A: C₆H₁₂
    2. Option B: C₆H₁₀
    3. Option C: C₆H₁₃
    4. Option D: C₆H₁₄
    Show the answer to question 4

    Answer: D, C₆H₁₄

    Alkanes follow CₙH₂ₙ₊₂, so hexane with 6 carbon atoms is C₆H₁₄.

  5. Question 5

    Atomic structure

    An atom of fluorine has atomic number 9 and mass number 19. How many neutrons are in its nucleus?

    1. Option A: 19
    2. Option B: 9
    3. Option C: 28
    4. Option D: 10
    Show the answer to question 5

    Answer: D, 10

    Neutrons = mass number − atomic number = 19 − 9 = 10.

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