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WAEC WASSCE 2016

WAEC Chemistry 2016 past questions

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

All WAEC Chemistry past questions

  1. Question 1

    Gas laws

    A fixed mass of gas occupies 660 cm³ at a pressure of 2 atm. What volume will it occupy at 5 atm if the temperature stays constant?

    1. Option A: 264 cm³
    2. Option B: 1650 cm³
    3. Option C: 660 cm³
    4. Option D: 6600 cm³
    Show the answer to question 1

    Answer: A, 264 cm³

    By Boyle's law, P₁V₁ = P₂V₂, so V₂ = 2 × 660 ÷ 5 = 264 cm³.

  2. Question 2

    Organic chemistry

    What is the molecular formula of hexene?

    1. Option A: C₆H₁₄
    2. Option B: C₆H₁₂
    3. Option C: C₆H₁₀
    4. Option D: C₆H₁₃
    Show the answer to question 2

    Answer: B, C₆H₁₂

    Alkenes follow CₙH₂ₙ, so hexene with 6 carbon atoms is C₆H₁₂.

  3. Question 3

    Acids, bases and salts

    Which acid is found in the human stomach?

    1. Option A: Tetraoxosulphate(VI) acid
    2. Option B: Hydrochloric acid
    3. Option C: Trioxonitrate(V) acid
    4. Option D: Ethanoic acid
    Show the answer to question 3

    Answer: B, Hydrochloric acid

    The stomach secretes hydrochloric acid.

  4. Question 4

    Mole concept

    How many moles are there in 8 g of magnesium oxide (MgO)? [Mg = 24, O = 16]

    1. Option A: 0.4 mol
    2. Option B: 0.1 mol
    3. Option C: 0.2 mol
    4. Option D: 2 mol
    Show the answer to question 4

    Answer: C, 0.2 mol

    Moles = mass ÷ molar mass = 8 ÷ 40 = 0.2 mol.

  5. Question 5

    Atomic structure

    An atom of sulphur has atomic number 16 and mass number 32. How many neutrons are in its nucleus?

    1. Option A: 16
    2. Option B: 32
    3. Option C: 48
    4. Option D: 17
    Show the answer to question 5

    Answer: A, 16

    Neutrons = mass number − atomic number = 32 − 16 = 16.

  6. Question 6

    Periodic table

    In which group of the periodic table is sulphur found?

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

    Answer: C, Group VI

    Sulphur (configuration 2, 8, 6) is in Group VI.

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