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Author Topic: CORRECT: 2019/2020 WAEC CHEMISTRY PRACTICAL Questions And Answer Expo/Runs free  (Read 1936 times)

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Offline JEFFREY96

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Real 2019/2020 WAEC CHEMISTRY PRACTICAL Real Questions And Answers  Expo Runs Runz
====================
*Monday 6th May, 2019*
Chemistry 3 (Practical) (Alternative A) – 09:30 a.m. – 11:30 a.m. (1st Set)
Chemistry 3 (Practical) (Alternative A) – 12:00 noon – 2:00 p.m. (2nd Set)
====================

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    Offline Olelewe240

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    Jeffrey we are yet to get the answers.... Time is no longer on our side. Please

    Offline JEFFREY96

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    Jeffrey we are yet to get the answers.... Time is no longer on our side. Please
    3ai)
    On adding BaCl2 solution to a portion of saturated Na2Co3,white ppt is formed, Precipitate dissolves on adding excess dilute HCl.
    3aii) Q is a reducing agent like SO2, H2S,CO
    3bi)Calcium Oxide(CaO)
    3bii)Concentrated H2SO4
    3c)NaOH pellet is deliquescent because it absorbs moisture from the atmosphere to form solution.
    ==========
    (2a)
    Test: C + Water and filtered

    Observation: part of C dissolves, colour less filtrate is formed

    Inference: C is a mixture of a soluble salt

    (2bi)
    Test: 2cm^2 of filterate of salt C + AgNO3(aq) then dilute HNO3

    Observation: white precipitate is formed

    Inference: Cl^- present

    (2bii)
    Test: Solution im 2(b)(i) + excess NH3 solution

    Observation: precipitate disorder in excess solution of NH3

    Inference; Cl^- confirmed

    (2ci)
    Test: Resident + dilute HCl + shake

    Observation; residue dissolved to form a blue solution

    Inference; Cu^2+ present

    (2cii)
    Test; solution in 2(c)(i) + NH3 solution in drops and then in excess

    Observation: light pale blue precipitate is formed precipitate dissolved in excess solution of NH3 to give a deep blue solution

    Inference; Cu^2+ confirmed.
       
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