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JAMB UTME 2017

JAMB Chemistry 2017 past questions

6 objective questions from the 2017 JAMB Chemistry paper. Answer each one, then reveal the answer and explanation.

All JAMB Chemistry past questions

  1. Question 1

    Periodic table

    In which group of the periodic table is neon found?

    1. Option A: Group II
    2. Option B: Group III
    3. Option C: Group IV
    4. Option D: Group 0
    Show the answer to question 1

    Answer: D, Group 0

    Neon (configuration 2, 8) is in Group 0.

  2. Question 2

    Acids, bases and salts

    Which acid is present in vinegar?

    1. Option A: Citric acid
    2. Option B: Lactic acid
    3. Option C: Methanoic acid
    4. Option D: Ethanoic acid
    Show the answer to question 2

    Answer: D, Ethanoic acid

    Vinegar is a dilute solution of ethanoic (acetic) acid.

  3. Question 3

    Chemical symbols

    What is the chemical symbol of sodium?

    1. Option A: Na
    2. Option B: So
    3. Option C: S
    4. Option D: N
    Show the answer to question 3

    Answer: A, Na

    Sodium is Na, from its Latin name natrium.

  4. Question 4

    Gas laws

    A fixed mass of gas occupies 300 cm³ at a pressure of 6 atm. What volume will it occupy at 3 atm if the temperature stays constant?

    1. Option A: 150 cm³
    2. Option B: 600 cm³
    3. Option C: 300 cm³
    4. Option D: 5400 cm³
    Show the answer to question 4

    Answer: B, 600 cm³

    By Boyle's law, P₁V₁ = P₂V₂, so V₂ = 6 × 300 ÷ 3 = 600 cm³.

  5. Question 5

    Mole concept

    How many moles are there in 14.63 g of sodium chloride (NaCl)? [Na = 23, Cl = 35.5]

    1. Option A: 0.5 mol
    2. Option B: 0.13 mol
    3. Option C: 0.25 mol
    4. Option D: 2.5 mol
    Show the answer to question 5

    Answer: C, 0.25 mol

    Moles = mass ÷ molar mass = 14.63 ÷ 58.5 = 0.25 mol.

  6. Question 6

    Atomic structure

    An atom of argon has atomic number 18 and mass number 40. How many neutrons are in its nucleus?

    1. Option A: 22
    2. Option B: 40
    3. Option C: 18
    4. Option D: 58
    Show the answer to question 6

    Answer: A, 22

    Neutrons = mass number − atomic number = 40 − 18 = 22.

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