Neco Chemistry Expo Free 2017 (Questions n Answers)

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  1. 2ai)
    oxidation is a process involving a loss of electron(s), Reduction is a process in which an electronagetive element loses electron while an electropositive element gains electron.
    i)nitrogen is colourless,ordourless and testsless gas
    ii)it is slightly soluble in water
    x is (NH2)2 CO
    y is H20
    E/configuration=1s^2, 2s^2, 2p^6 3s^2, 3p^5 atomic number is 9
    avogrado’s constant=6.02*10^23
    iii)fractional abundance
    =1/3 and 2/3
    =1/3 * 18 + 2/3 * 20
    faraday’s second law of electrolysis states “When the same quantity of electricity is passed through different electrolytes, the masses of different ions liberated at the electrodes are directly proportional to their chemical equivalents (Equivalent weights).
    the single line represents one electron while double bonds represent two electrons
    polymerization is any process in which relatively small molecules, called monomers, combine chemically to produce a very large chainlike or network molecule, called a polymer.
    i)it is used for making wine,beer,etc
    ii)it is used as fuel
    iii)it is used as preservative and steriling liquids
    iv)it used for making anti-freeze reagents in automobile radiators
    I)solution A is starch solution, sample B is Iodine
    II)the colouration is formed due to the formation of an Iodine starch complex
    i)Iodine is used in treatment of goitre
    ii)Iodine is used in making dye for colour photography
    dalton’s law of partial pressure states that in a mixture of non-reacting gases, the total pressureexerted is equal to the sum of the partial pressuresof the individual gases.
    C – 4.08/12, H – 0.68/1, O – 5.46/16
    0.34/0.34, 0.68/034, 0.34/0.34
    1, 2, 1.
    The emperical formula is CH2O
    ( CH2O)n =60
    the molecular formular is C2H202
    i)exothermic reaction
    ii)A is activation energy, B is DH(Negative)
    i)removeal of carbon(iv)oxide
    ii)liquetying the air
    vander waal forces
    fats have higher melting point than oil because fats are more denser
    i)it is poisonous
    ii)it is 2,5 times denser than air
    iii)it is greenish-yellow gas with a choking smell
    Zn^2+ has comppletely filled d-orbitals and there are no vacant d-orbitals for the transition of electrons while Sc^3+ has completely empty d-orbital and there are no electrons for d-d transition thus they are colourless

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