WAEC Chemistry 3 Alternative practical questions and answers available

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WAEC Chemistry 3 Alternative practical questions and answers available 2022, WAEC Chemistry obj.and theory practical expo

*Tuesday, 14th June, 2022*

Chemistry 3 (Practical) (Alternative A) 09:30am – 11:30am (1st Set)


Chemistry 3 (Practical) (Alternative A) 12:00pm – 2:00pm (2nd Set)



WAEC Biology Questions and Answers 2022 for May/June 2022 is now. WAEC Biology Theory and Objective Answers (100% sure) Biology 2 Essay verified Free (Expo) for West African Examinations Council. WAEC Biology Questions For you to have good WAEC result in Biology as well as repeated questions for free in this post. You will also understand how WAEC Biology questions are set and how to answer them. The West African Examinations Council is an examination board established by law to determine the examinations required in the public interest in the English-speaking West African countries, to conduct the examinations and to award certificates comparable to those of equivalent examining authorities internationally


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2 Comments

  1. (1a)
    Volume of pipette used, VA = 25.0cm³

    [TABULATE]

    Burette Reading | Rough titre | 1st titre | 2nd titre |

    Final Burette reading (cm³) | 25.60 | 32.80 | 26.40

    Initial Burette reading (cm³) | 1.20 | 8.70 | 2.30

    Volume of Na₂S₂O₃ used | 24.40 | 24.10 | 24.10

    Average burette reading = (24.10 + 24.10)/2
    Average volume of Na₂S₂O₃ used = 24.10cm³
    VB = 24.10cm³

    (1bi)
    Given: CB = 0.1mol/dm³
    VB = 24.10cm³
    VA = 25.0cm³
    CA =?
    From equation nA/nB = 1/2
    .: Using (CABA)/CBVB = (nA)/nB

    (CA x 25)/(0.1×24.10) = 1/2
    CA = (0.1×24.10)/(25×2)
    CA = 0.0482mol/dm³
    .: Concentration of iodine in A = 0.0482mol/dm³

    (1bii)
    Mass in gramms of iodine in 1dm³ of A = Molarity × Molar mass of iodine
    = 0.0482×127(2)
    = 12.2428g/dm³
    =============================

    (2a)
    [TABULATE]

    =TEST=
    C + Distilled water

    =OBSERVATION=
    It dissolves completely to give a light green solution.

    =INFERENCE=
    Soluble salt.

    (2ai)
    =TEST=
    Solution C + NaOH in drops and in excess + Heat gently

    =OBSERVATION=
    A dirty green precipitate is formed which remains insoluble in excess.
    Effervescence occurs in which a colourless gas with a pungent smell which turns red litmus blue is given off.

    =INFERENCE=
    Fe²⁺ is present.
    NH₃ gas form.
    NH₄⁺ is present.

    (2aii)
    =TEST=
    Solution + BaCl₂ + dilute HCL in excess

    =OBSERVATION=
    A white precipitate is formed.
    The white precipitate remains insoluble and gives a white dense forms

    =INFERENCE=
    SO₄²⁻, CO₃²⁻, SO₃²⁻, is present.
    SO₄²⁻ confirmed.

    (2b)
    Cations → Fe²⁺ and NH₄⁺
    Anions → SO₄²⁻
    =============================

    (3a)
    Carbon (iv) oxide turns like water milky white while sulphur (iv) oxide does not

    (3b)
    (I) H₂: Downward displacement of air
    (II) NH₃: Downward displacement of air
    (III) HCL: Upward displacement of air

    (3bii)
    I – It is less dense than air
    II – It is less dense than air
    III – It is denser than air

    (3c)
    (i) Distillation
    (ii) Filtration followed by evaporation to dryness

    (3d)
    This is because KCl react with NaHCO₃ to form two salts
    =============================

    Completed

  2. [6/14, 10:27 AM] Naijahero: (3a)

    (3bi)
    (I) H2 ; downward displacement of water
    (II) NH3; downward displacement of air
    (III) HCL; upward displacement of air

    (3bii)
    (I) Hydrogen gas(H2) is collected by the downward displacement of water because It is insoluble in water and It form an explosive mixture with air.

    (II) Ammonia gas(NH3) is collected by downward displacement of air because it is lighter than air

    (III) HCl gas is collected by upward displacement of air because it is 1.28 times heavier than air.

    (3c)
    (i) Distillation
    (ii) Filtration followed by evaporation to dryness

    (3d)

    More coming
    [6/14, 10:36 AM] Naijahero: (3a)
    Sulphur Dioxide Solution Turns Acidified Potassium Chromate Solution green Where As carbon dioxide Shows no Change

    (3bi)
    (I) H2 ; downward displacement of water
    (II) NH3; downward displacement of air
    (III) HCL; upward displacement of air

    (3bii)
    (I) Hydrogen gas(H2) is collected by the downward displacement of water because It is insoluble in water and It form an explosive mixture with air.

    (II) Ammonia gas(NH3) is collected by downward displacement of air because it is lighter than air

    (III) HCl gas is collected by upward displacement of air because it is 1.28 times heavier than air.

    (3c)
    (i) Distillation
    (ii) Filtration followed by evaporation to dryness

    (3d)

    More coming

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