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JAMB UTME 2021

JAMB Chemistry 2021 past questions

5 objective questions from the 2021 JAMB Chemistry paper. Answer each one, then reveal the answer and explanation.

All JAMB Chemistry past questions

  1. Question 1

    Mole concept

    How many moles are there in 1.7 g of ammonia (NH₃)? [N = 14, H = 1]

    1. Option A: 0.2 mol
    2. Option B: 0.1 mol
    3. Option C: 0.05 mol
    4. Option D: 1 mol
    Show the answer to question 1

    Answer: B, 0.1 mol

    Moles = mass ÷ molar mass = 1.7 ÷ 17 = 0.1 mol.

  2. Question 2

    Periodic table

    In which group of the periodic table is calcium found?

    1. Option A: Group I
    2. Option B: Group III
    3. Option C: Group II
    4. Option D: Group IV
    Show the answer to question 2

    Answer: C, Group II

    Calcium (configuration 2, 8, 8, 2) is in Group II.

  3. Question 3

    Organic chemistry

    What is the molecular formula of propane?

    1. Option A: C₃H₆
    2. Option B: C₃H₄
    3. Option C: C₃H₇
    4. Option D: C₃H₈
    Show the answer to question 3

    Answer: D, C₃H₈

    Alkanes follow CₙH₂ₙ₊₂, so propane with 3 carbon atoms is C₃H₈.

  4. Question 4

    Chemical symbols

    What is the chemical symbol of mercury?

    1. Option A: Hg
    2. Option B: Me
    3. Option C: M
    4. Option D: Mr
    Show the answer to question 4

    Answer: A, Hg

    Mercury is Hg, from its Latin name hydrargyrum.

  5. Question 5

    Electronic configuration

    What is the electronic configuration of aluminium (atomic number 13)?

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

    Answer: C, 2, 8, 3

    Fill the shells in order, 2 then 8 then 8: aluminium has 13 electrons, arranged 2, 8, 3.

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