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2019 NECO CHEMISTRY OBJ AND THEORY ANSWERS
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2019 NECO YOURUBA OBJ AND THORY ANSWERS
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NECO 2019 - CHEMISTRY & LANGUAGE OBJ & THEORY ANSWERS
Exam Time: Tuesday 2ND JULY
4062 Paper II&III Objective and theory 2hrs 10:00am – 1:30noon
4092 Paper III&II Obj Theory– 2h40mins 2:30pm – 4:40pm
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NECO 2019 LITERATURE & YORUBA ANSWERS
GENERAL INSTRUCTION
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⇾ Read all the instrution from the question paper before answering. e.g you may be asked to answer only two questions
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OBJ SECTION
Tuesday 2nd July
2013/2012 Paper III & II: Objective & Essay – 2hrs 30mins 2:30:00am – 4:30pm
2019 NECO CHEMISTRY ANSWERS
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CEMISTRY OBJ
1-10 BEDEABCCEC
11-20ACDCBCDCAB
21-30EAECBCDBAC
31-40BBBACCBBDD
41-50ACDEEACBDB
51-60CCEBCBBCBD
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ESSAY/THEORY SECTION
*2019 CHEMISTRY ANSWERS*
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INSTRUCTION: _keep refreshing
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(1ai) Ammonium Chloride -> Sublimation
Ink -> Chromatography
Iron filling -> Magnetic
(1aii)
Examples of Physical changes are: Change of matter, Evaporation of sodium chloride
Examples of Chemical Changes are: Burning of firewood, Rusting of Iron
(1bi)
(i) They are good reducing agents
(ii) They formed basic oxide
(iii) They formed electrovalent bonding
(1bii)
Aluminum tetraixosulphate (vi)is prepared by the action of hot concentrated tertaoxosulphte (vi) acid on aluminum oxide
Al₂O₃ (s) + 3H₂SO₄ (aq) ( Al₂(SO₄)₃(aq) +3H₂O(l)
Aluminum tetraoxosulphate (vi) is moderately soluble in water.
(1ci) PICK TWO:
(i) Hydrogen Sulphide
(ii) It is dense than air
(iii) It is very poisonous
(iv) It burn with a pale blue flame
(v) It is weakly acidic to litmus
(1cii)
Pb(NO₃)₂ + H₂S PbS + 2HN03
(1ciii)
Pb(N0₃)₂aq + H₂Sg, ( PbSs + 2HN0₃aq
(1civ) It turn black due to the formation of black lead (ii) sulphide.
(1di)
Water gas contains flammable gases whereas the producer gas contains both flammable and non-flammable gases.
(1dii)
(i) Diamond ( Octahedral in shape
(ii) Graphite Hexagonal in shape
(1e)
(i) for manufacturing of ammonia and fertilizer
(ii) It is used as a refrigerant and also used to shrink metal parts
(iii) It is used in grinding substances that are too tough to grind at normal temperature.
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(2aii)
Avogadro's law states that equal volumes of all gases under the same temperature and pressure contain the same number of molecules
(2aii)
no2=?
2SO2(g) + O2 ---> 2SO3(g)
2 : 1 : 2
VSO2 = 7.50dm^3
nSO2 = V/Vm = 7.50/22.4 = 0.3348moles
2moles of SO2 ----> 1 moles of O2
0.3348 ----> x
x = 0.3348/2 = 0.1674moles
nO2 = 0.1674moles
np = n × L = 0.167 × 6.02 × 10^23
np = 1.008 × 10^23molecules
np = 1.01×10^23 molecules
(2bi)
(I) NaCl -----> Valency of chlorine is 1
(II) NaO2 -----> Valency of oxygen is 2
(III) Na3N ------> Valency of Nitrogen is 3
(2bii)
- Formation of black soap
- Formation of glycerol
- It helps in the precipitation of large biomolecules such as protein
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(3ai)
Chemical industry are companies that produce industrial chemicals
(3aii)
- Favourable climatic conditions
- It's nearness to the source of raw materials
- The availability of space to store raw materials
(3b)
(i) It is aldose and it contains alkanal (-CHO) group
(ii) Brick red precipitate is formed
(iii) Reducing sugar possess a free aldehyde (-CHO) or ketone (-C=O) group while non reducing sugar a free aldehyde or ketone group is lacking
(3ci)
(i) Pollution is the release of unwanted materials into the environment which cause adverse change
(ii) Pollutant is a substance or energy introduced into the environment that has undesired effects or adversely effects the usefulness of a resource
(3cii)
(i)Plastic
(ii)Polythene
(iii)Pesticides
(3ciii)
VC2H2=?
MCaCa=3.2g
MCaCa=40+(2*12)
=40+24
=64glmol
n=m/m=3.2/64
n=0.05mole of CaC2
CaC2+2H2O ---> Can(OH)2+C2H2
0.05mole of CaC2 ----> 0.05mole of C2H2 because the mole ratio are equal
NC2H2=0.05moles
n=V/VM
VC2H2=n*Vm = 0.05*22.4
VC2H2=1.12dm³
(3d)
(i)Na2CO3 ----> soluble
(ii)K2CO3 ----> soluble
(iii)ZnCO3 ----> insoluble
(iv)(NH4)2CO3 ----> soluble
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