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JAMB UTME 2016

JAMB Chemistry 2016 past questions

6 objective questions from the 2016 JAMB Chemistry paper. Answer each one, then reveal the answer and explanation.

All JAMB Chemistry past questions

  1. Question 1

    Organic chemistry

    What is the molecular formula of octane?

    1. Option A: C₈H₁₈
    2. Option B: C₈H₁₆
    3. Option C: C₈H₁₄
    4. Option D: C₈H₁₇
    Show the answer to question 1

    Answer: A, C₈H₁₈

    Alkanes follow CₙH₂ₙ₊₂, so octane with 8 carbon atoms is C₈H₁₈.

  2. Question 2

    Gas laws

    A fixed mass of gas occupies 240 cm³ at a pressure of 1 atm. What volume will it occupy at 2 atm if the temperature stays constant?

    1. Option A: 120 cm³
    2. Option B: 480 cm³
    3. Option C: 240 cm³
    4. Option D: 60 cm³
    Show the answer to question 2

    Answer: A, 120 cm³

    By Boyle's law, P₁V₁ = P₂V₂, so V₂ = 1 × 240 ÷ 2 = 120 cm³.

  3. Question 3

    Acids, bases and salts

    The reaction of an acid with a base to form a salt and water only is called

    1. Option A: hydrolysis
    2. Option B: esterification
    3. Option C: oxidation
    4. Option D: neutralisation
    Show the answer to question 3

    Answer: D, neutralisation

    Acid + base → salt + water is neutralisation.

  4. Question 4

    Mole concept

    How many moles are there in 88 g of carbon(IV) oxide (CO₂)? [C = 12, O = 16]

    1. Option A: 4 mol
    2. Option B: 1 mol
    3. Option C: 20 mol
    4. Option D: 2 mol
    Show the answer to question 4

    Answer: D, 2 mol

    Moles = mass ÷ molar mass = 88 ÷ 44 = 2 mol.

  5. Question 5

    Atomic structure

    An atom of phosphorus has atomic number 15 and mass number 31. How many neutrons are in its nucleus?

    1. Option A: 31
    2. Option B: 15
    3. Option C: 46
    4. Option D: 16
    Show the answer to question 5

    Answer: D, 16

    Neutrons = mass number − atomic number = 31 − 15 = 16.

  6. Question 6

    Periodic table

    In which group of the periodic table is lithium found?

    1. Option A: Group II
    2. Option B: Group III
    3. Option C: Group IV
    4. Option D: Group I
    Show the answer to question 6

    Answer: D, Group I

    Lithium (configuration 2, 1) is in Group I.

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