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Neco Expo 2017 Chemistry Obj And Theory Answers – May/June Answers


CHEMISTRY OBJ:
1ACBACDCCAB
11CCAAECADBC
21ECAEBBDADC
31CABEBCABBE
41ABCBAABDEB
51CEEEECEBDC
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.
2aii)
i)nitrogen is colourless,ordourless and testsless gas
ii)it is slightly soluble in water
2aiii)
x is (NH2)2 CO
y is H20
2bi)
i)element-chlorine
E/configuration=1s^2, 2s^2, 2p^6 3s^2, 3p^5 atomic number is 9
ii)NaOH=(23*1+16*1+1*1)
=23+16+1=40g
avogrado's constant=6.02*10^23
5g=5/40*6.02*10^23
=6.02*10^23=0.753*10^23
=7.53*10^22moles
iii)fractional abundance
=1/3 and 2/3
=1/3 * 18 + 2/3 * 20
=18/3+40/3=58/3
=19.33g
2ci)
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).
2cii)
the single line represents one electron while double bonds represent two electrons
2ciii)
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.
2civ)
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
6ai)
I)solution A is starch solution, sample B is Iodine
II)the colouration is formed due to the formation of an Iodine starch complex
III)
i)Iodine is used in treatment of goitre
ii)Iodine is used in making dye for colour photography
6aii)
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.
6bi)
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
6bii)
( CH2O)n =60
((12*1)+(1*2)+(16*1))n=60
(12+2+16)n=60
30n/30=60/30
n=2
(CH2O)2=C2H4O2
the molecular formular is C2H202
6ci)
i)exothermic reaction
ii)A is activation energy, B is DH(Negative)
6cii)
i)removeal of carbon(iv)oxide
ii)liquetying the air
6ciii)
vander waal forces
6di)
fats have higher melting point than oil because fats are more denser
6dii)
i)it is poisonous
ii)it is 2,5 times denser than air
iii)it is greenish-yellow gas with a choking smell
6diii)
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
5ai)
Peroxides are compounds in which there is an oxygen-oxygen bond, -O-O-. Oxygen atoms stick together in pairs to form oxygen gas, O2, and in threes to make ozone, O3, but do not form longer chains, as sulphur does so readily.
5aii)
i)Hydrogen peroxide
ii)inorganic peroxides


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