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JAMB UTME 2023

JAMB Chemistry 2023 past questions

5 objective questions from the 2023 JAMB Chemistry paper. Answer each one, then reveal the answer and explanation.

All JAMB Chemistry past questions

  1. Question 1

    Chemical symbols

    What is the chemical symbol of manganese?

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

    Answer: A, Mn

    Manganese is Mn; Mg is magnesium.

  2. Question 2

    Atomic structure

    An atom of carbon has atomic number 6 and mass number 12. How many neutrons are in its nucleus?

    1. Option A: 12
    2. Option B: 6
    3. Option C: 18
    4. Option D: 7
    Show the answer to question 2

    Answer: B, 6

    Neutrons = mass number − atomic number = 12 − 6 = 6.

  3. Question 3

    Organic chemistry

    What is the molecular formula of pentane?

    1. Option A: C₅H₁₀
    2. Option B: C₅H₈
    3. Option C: C₅H₁₂
    4. Option D: C₅H₁₁
    Show the answer to question 3

    Answer: C, C₅H₁₂

    Alkanes follow CₙH₂ₙ₊₂, so pentane with 5 carbon atoms is C₅H₁₂.

  4. Question 4

    Gas laws

    A fixed mass of gas occupies 60 cm³ at a pressure of 2 atm. What volume will it occupy at 4 atm if the temperature stays constant?

    1. Option A: 120 cm³
    2. Option B: 60 cm³
    3. Option C: 30 cm³
    4. Option D: 480 cm³
    Show the answer to question 4

    Answer: C, 30 cm³

    By Boyle's law, P₁V₁ = P₂V₂, so V₂ = 2 × 60 ÷ 4 = 30 cm³.

  5. Question 5

    Electronic configuration

    What is the electronic configuration of boron (atomic number 5)?

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

    Answer: C, 2, 3

    Fill the shells in order, 2 then 8 then 8: boron has 5 electrons, arranged 2, 3.

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