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    Kiangsu-Chekiang College (Shatin) Form 4 Chemistry TOPIC: Redox Reactions Exercise

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    4D (05) Chan Wing Sum - 陳穎心

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    Kiangsu-Chekiang College (Shatin) Form 4 Chemistry TOPIC: Redox Reactions Exercise

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    4D (05) Chan Wing Sum - 陳穎心
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    Kiangsu-Chekiang College (Shatin) Form 4 Chemistry TOPIC: Redox Reactions Exercise

    Uploaded by

    4D (05) Chan Wing Sum - 陳穎心

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    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
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    F.4 Chem.

    Ex (2012-2013)

    KIANGSU-CHEKIANG COLLEGE (SHATIN)


    FORM 4 CHEMISTRY
    TOPIC: Redox reactions Exercise

    1. Write ionic half equations and ionic equation for each of the following reaction:

    (a) acidified potassium permanganate solution + potassium iodide solution


    oxidation:
    reduction:
    redox reaction:

    (b) acidified potassium dichromate solution + sodium sulphite solution


    oxidation:
    reduction:
    redox reaction:

    (c) concentrated nitric acid + copper


    oxidation:
    reduction:
    redox reaction:

    (d) dilute nitric acid + zinc


    oxidation:
    reduction:
    redox reaction:

    (e) bromine water + iron(II) sulphate solution


    oxidation:
    reduction:
    redox reaction:

    (f) CrO42-(aq) + S(s) ¾¾¾® Cr2O3(s) + SO42-(aq) (in alkaline solution)


    oxidation:
    reduction:
    redox reaction:

    Page 1
    F.4 Chem. Ex (2012-2013)

    2. Write an ionic equation for each of the following redox reactions:

    (a) Sodium sulphite solution + acidified potassium dichromate solution.

    (b) Potassium iodide solution + iron(III) sulphate solution in acidic medium.

    (c) P4(s) + concentrated HNO3(aq) to form PO43-(aq) and NO2(g).

    (d) VO2+(aq) + Zn(s) to form Zn(OH)2(s) + V(OH)3(s) in alkaline medium.

    (e) H2S(g) + dilute HNO3(aq) to form NO(g) + SO42-(aq)

    (f) KMnO4(aq) + Na2C2O4(aq) to form MnO2(s) + CO32-(aq) in alkaline medium

    The End

    Page 2
    F.4 Chem. Ex (2012-2013)

    KIANGSU-CHEKIANG COLLEGE (SHATIN)


    FORM 4 CHEMISTRY
    TOPIC: Redox reactions Exercise (Suggested Answer)

    1. (a) oxidation: 2I- ¾® I2 + 2e-


    reduction: MnO4- + 8H+ + 5e- ¾® Mn2+ + 4H2O
    redox reaction: 2MnO4- + 10I- + 16H+ ¾® 2Mn2+ + 5I2 + 8H2O
    (b) oxidation: SO32- + H2O ¾® SO42- + 2H+ +2e-
    reduction: Cr2O72- + 14H+ + 6e- ¾® 2Cr3+ + 7H2O
    redox reaction: Cr2O72- + 8H+ + 3SO32- ¾® 2Cr3+ + 3SO42- + 4H2O
    (c) oxidation: Cu ¾® Cu2+ + 2e-
    reduction: NO3- + 2H+ + e- ¾® NO2 + H2O
    redox reaction: Cu + 2NO3- + 4H+ ¾® Cu2+ + 2NO2 + 2H2O
    (d) oxidation: Zn ¾® Zn2+ + 2e-
    reduction: NO3- + 4H+ + 3e- ¾® NO + 2H2O
    redox reaction: 3Zn+ 2NO3- + 8H+ ¾® 3Zn2+ + 2NO + 4H2O
    (e) oxidation: Fe2+ ¾® Fe3+
    reduction: Br2 + 2e- ¾® 2Br-
    redox reaction: 2Fe2+ + Br2 ¾® 2Fe3+ + 2Br-
    (f) oxidation: S + 8OH- ¾® SO42- + 6e- + 4H2O
    reduction: 2CrO42- + 6e- +5H2O ¾® Cr2O3 + 10OH-
    redox reaction: S + 2CrO42- + H2O ¾® SO42- + Cr2O3 + 2OH-

    2. (a) 3SO32-(g) + Cr2O72-(aq) + 8H+(aq)  3SO42-(aq) + 2Cr3+(aq) + 4H2O(ℓ)


    (b) 2I-(aq) + 2Fe3+(aq)  I2(aq) + 2Fe2+(aq)
    (c) P4(s) + 20 NO3-(aq) + 8H+ 20 NO2(g) + 4PO43-(aq) + 4H2O(ℓ)
    (d) 2VO2+(aq) + Zn(s) + 4OH-(aq) + 2H2O(ℓ) Zn(OH)2(s) + 2V(OH)3(s)
    (e) 3H2S(g) + 8NO3-(aq) + 2H+(aq) 8NO(g) + 3SO42-(aq) + 4H2O(ℓ)
    (f) 2MnO4-(aq) + 3C2O42-(aq) + 4OH-(aq)  2MnO2(s) + 6CO32-(aq) + 2H2O(ℓ)

    The End

    Page 3

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