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JAMB UTME 2019

JAMB Chemistry 2019 past questions

7 objective questions from the 2019 JAMB Chemistry paper. Answer each one, then reveal the answer and explanation.

All JAMB Chemistry past questions

  1. Question 1

    Periodic table

    Elements in the same group of the periodic table have the same

    1. Option A: mass number
    2. Option B: number of valence electrons
    3. Option C: number of neutrons
    4. Option D: number of shells
    Show the answer to question 1

    Answer: B, number of valence electrons

    A group is a column of elements with the same number of outer electrons.

  2. Question 2

    Electronic configuration

    What is the electronic configuration of lithium (atomic number 3)?

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

    Answer: C, 2, 1

    Fill the shells in order, 2 then 8 then 8: lithium has 3 electrons, arranged 2, 1.

  3. Question 3

    Acids, bases and salts

    Which gas is given off when zinc reacts with dilute hydrochloric acid?

    1. Option A: Hydrogen
    2. Option B: Oxygen
    3. Option C: Carbon(IV) oxide
    4. Option D: Chlorine
    Show the answer to question 3

    Answer: A, Hydrogen

    Metals above hydrogen displace it from dilute acids.

  4. Question 4

    Chemical symbols

    What is the chemical symbol of silver?

    1. Option A: Si
    2. Option B: Sl
    3. Option C: Ag
    4. Option D: Au
    Show the answer to question 4

    Answer: C, Ag

    Silver is Ag, from its Latin name argentum.

  5. Question 5

    Mole concept

    How many moles are there in 60 g of sodium hydroxide (NaOH)? [Na = 23, O = 16, H = 1]

    1. Option A: 3 mol
    2. Option B: 0.75 mol
    3. Option C: 1.5 mol
    4. Option D: 15 mol
    Show the answer to question 5

    Answer: C, 1.5 mol

    Moles = mass ÷ molar mass = 60 ÷ 40 = 1.5 mol.

  6. Question 6

    Gas laws

    A fixed mass of gas occupies 420 cm³ at a pressure of 2 atm. What volume will it occupy at 8 atm if the temperature stays constant?

    1. Option A: 1680 cm³
    2. Option B: 420 cm³
    3. Option C: 6720 cm³
    4. Option D: 105 cm³
    Show the answer to question 6

    Answer: D, 105 cm³

    By Boyle's law, P₁V₁ = P₂V₂, so V₂ = 2 × 420 ÷ 8 = 105 cm³.

  7. Question 7

    Periodic table

    In which group of the periodic table is carbon found?

    1. Option A: Group V
    2. Option B: Group VI
    3. Option C: Group IV
    4. Option D: Group VII
    Show the answer to question 7

    Answer: C, Group IV

    Carbon (configuration 2, 4) is in Group IV.

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