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    Sulphur Dioxide Solution Turns Acidified Potassium Chromate Solution green Where As carbon dioxide Shows no Change



    (I) H2 ; downward displacement of water

    (II) NH3; downward displacement of air

    (III) HCL; upward displacement of air



    (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.


    (i) Distillation

    (ii) Filtration followed by evaporation to dryness




    Volume of pipette used, VA = 25.0cm³


    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


    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


    Mass in gramms of iodine in 1dm³ of A = Molarity × Molar mass of iodine

    = 0.0482×127(2)

    = 12.2428g/dm³





    C + Distilled water


    It dissolves completely to give a light green solution.


    Soluble salt.



    Solution C + NaOH in drops and in excess + Heat gently


    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.


    Fe²⁺ is present.

    NH₃ gas form.

    NH₄⁺ is present.



    Solution + BaCl₂ + dilute HCL in excess


    A white precipitate is formed.

    The white precipitate remains insoluble and gives a white dense forms


    SO₄²⁻, CO₃²⁻, SO₃²⁻, is present.

    SO₄²⁻ confirmed.


    Cations → Fe²⁺ and NH₄⁺

    Anions → SO₄²⁻



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



    (I) H₂: Downward displacement of air

    (II) NH₃: Downward displacement of air

    (III) HCL: Upward displacement of air



    I – It is less dense than air

    II – It is less dense than air

    III – It is denser than air



    (i) Distillation

    (ii) Filtration followed by evaporation to dryness



    This is because KCl react with NaHCO₃ to form two salts



    Completed ✅✅✅

    IJMB 5


    (1)Expensive to operate

    One of the disadvantages of multi-party system is that it is very expensive to run. All the parties vying for political power must convince the people to vote for them. They must organize rallies, advertise in the media, and buy airtime on radio and television and many other things to catch the eye of the voter. This needs money to prosecute.


    (2)it is divisive

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    (3)Provides too many choices

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    (4)Generates unnecessary rivalry

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    *NUMBER 6*

    Foreign policy is the rational pursuit of a set of national objectives. “Pursuit” suggests action, steps, and roles that will delineate the attitude or behaviour of a state in the external context. Foreign policy may be like a wedding ring with which the domestic context of a nation solemnizes its union with the international community.



    Foreign Policy can be defined as a set of principles, decisions and means, adopted and followed by a nation for securing her goals of national interest in international relations.




    1. . Size of State Territory:

    The size of a state is an important factor of its Foreign Policy. Size influences the psychological and operational environment within which the foreign policy-makers and public respond.


    2. Geographical Factor:

    Geography of a state is relatively the most permanent and stable factor of its foreign Policy. The topography of land, its fertility, climate and location are the major geographic factors which influence the Foreign Policy of a nation.


    3. Level and Nature of Economic Development:

    One of the main reasons why the US Foreign Policy has been very often successful in securing its national objectives, particularly in relation to the poor and economically lowly placed states of the world is the high degree of its economic development.




    4. Cultural and Historical Factors:

    The cultural heritage and the history of a nation are again important and valuable factors of its Foreign Policy. The norms and traditions that characterize the life of the people of a state are highly influential factors of its foreign policy.

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