Chemistry past questions: NECO SSCE 2009

47 objective questions, with answers. Free to read and practise.

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47 questions, one at a time, marked as you go or at the end. No account needed.

1.
\(^{235}_{92}U + ^1_0n → ^{145}_{56}Ba + ^{88}_{36}Kr + 3^1_0n + Energy\) The equation above represent a/an
1. A.alpha particle emission
2. B.endothermic reaction
3. C.nuclear fission
4. D.nuclear fusion
5. E.thermal dissociation
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Answer: C nuclear fission
2.
A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is
1. A.ammonia
2. B.carbon(IV)oxide
3. C.hydrogen chloride
4. D.sulphur (IV) oxide
5. E.sulphur (VI) oxide
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Answer: A ammonia
3.
A neon atom is chemically nonreactive because
1. A.the electrons at the outermost shell is partially filled
2. B.the number of protons equals the number of electrons
3. C.the outer electron shell is completely filled
4. D.there are equal number of protons and neutrons in its nucleus
5. E.there are no elections at the outermost shell
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Answer: C the outer electron shell is completely filled
4.
A salt which loses its mass when exposed to air is
1. A.deliquescent
2. B.effervescent
3. C.Efflorescent
4. D.fluorescent
5. E.hygroscopic
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Answer: C Efflorescent
5.
All the following belong to the same family EXCEPT
1. A.glycerol
2. B.nylon
3. C.perspex polyethene
4. D.polyethene
5. E.polystyrene
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Answer: A glycerol
6.
Atomic size decreases
1. A.across a period from left to right
2. B.across a period from right to left
3. C.diagonally down the group
4. D.down a group
5. E.with decrease in atomic number
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Answer: A across a period from left to right
7.
Brain tumors can be located by using an isotope of
1. A.carbon - 14
2. B.iodine 131
3. C.technetium 99
4. D.uranium235
5. E.uranium 238
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Answer: C technetium 99
8.
C \(_6\) H \(_{12}\) O \(_6\) What is the molar mass of the compound above? [ H=1, C=12, O=16 }
1. A.45
2. B.61
3. C.180
4. D.123
5. E.244
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Answer: C 180
9.
Compound with the general formula CnH \(_{2n+2}\) belong to the_______ group
1. A.alkanal
2. B.alkane
3. C.alkanoate
4. D.alkene
5. E.alkyne
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Answer: B alkane
10.
During the extraction of iron in the blast furnance, slag is produced using
1. A.carbon
2. B.crylite
3. C.limestone
4. D.oxygen
5. E.sulphur
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Answer: C limestone
11.
How many atoms of chlorine are required to saturate the double bonds of a compound containing a triene?
1. A.2
2. B.3
3. C.4
4. D.5
5. E.6
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Answer: E 6
12.
How many zones are present in a luminous Bunsen burner flame?
1. A.2
2. B.3
3. C.4
4. D.5
5. E.6
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Answer: C 4
13.
If the volume of a gas at 35°C is 60cm \(^3\) , what would be its volume in cm \(^3\) at 273k?
1. A.39.03
2. B.46.81
3. C.53.18
4. D.67.69
5. E.76.92
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Answer: C 53.18
14.
In the electrolysis of dilute tetraoxosulphate (VI) acid using platinum electrodes, the products obtained at the anode are cathode respectively are
1. A.hydrogen, oxygen
2. B.Hydrogen, tetraoxosulphate (VI) ion
3. C.oxygen, hydrogen
4. D.sulphur, hydrogen
5. E.sulphur, oxygen
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Answer: C oxygen, hydrogen
15.
Non-polar molecules are held together by
1. A.co-ordinate bond
2. B.covalent bond
3. C.electromagnetic force
4. D.hydrogen bond
5. E.Van der Waals forces
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Answer: E Van der Waals forces
16.
Ptotal = P1 + P2 + P3 +…………. Pn, is an expression of law
1. A.Boyle's
2. B.Charles'
3. C.Dalton's
4. D.Graham's
5. E.Gay Lussac's
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Answer: C Dalton's
17.
Sulphur has an oxidation number of +4 in
1. A.\(H _{2} S\)
2. B.\(H _{2}\) S\(0 _{4}\)
3. C.MgS\(O _{4}\)
4. D.N\(a _{2}\) S\(O _{3}\)
5. E.S\(0 _{3}\)
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Answer: D N\(a _{2}\) S\(O _{3}\)
18.
The empirical formula of a hydrocarbon containing 0.12 mole of carbon 0.3 mole of hydrogen is
1. A.C\(H _{2}\)
2. B.C\(H _{3}\)
3. C.\(C _{2} H _{2}\)
4. D.\(C _{2} H _{4}\)
5. E.\(C _{2} H _{6}\)
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Answer: B C\(H _{3}\)
19.
The following are ores of metals EXCEPT
1. A.bauxite
2. B.dolomite
3. C.graphite
4. D.haematite
5. E.magnetite
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Answer: C graphite
20.
The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT
1. A.HOC\(H _{2} –\) C\(H _{2}\) OH
2. B.\(H _{2} C –C =C–\) C\(H _{3}\)
3. C.\(H _{3} C –\) HC = C\(H _{2}\)
4. D.\(H _{2} C =\) C\(H _{2}\)
5. E.\(H _{3} C – C =\)CH
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Answer: A HOC\(H _{2} –\) C\(H _{2}\) OH
21.
The following equations represent redox reactions EXCEPT
1. A.B\(a ^{2+} (\)aq) + S\(O ^{2-}\) _{4} (aq) → BaS\(O _{4} (s)\)
2. B.C\(l _{2} (g) + 2\)B\(r ^{-} (\)aq) → 2C\(I ^{-} (\)aq) + B\(r _{2} (g)\)
3. C.F\(e ^{2+} (\)aq) + ½ \(C I _{2} (\)aq) → F\(e ^{3+} (\)aq) + C\(I ^{-} (\)aq)
4. D.2F\(e ^{3+} (\)aq) + S\(n ^{2+} (\)aq) → 2F\(e ^{2+} (\)aq) S\(n ^{4+} (\)aq)
5. E.Zn(s) + C\(U ^{2+} (\)aq) → Z\(n ^{2+} (\)aq) + CU(s)
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Answer: A B\(a ^{2+} (\)aq) + S\(O ^{2-}\) _{4} (aq) → BaS\(O _{4} (s)\)
22.
The furring of kettles and boilers are caused by
1. A.calcium hydroxide
2. B.calcium hydrogen trioxocarbonate (IV)
3. C.calcium trioxocarbonate (IV)
4. D.calcium tetraoxocarbonate
5. E.magnesium tetraoxocarbonate (VI)
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Answer: C calcium trioxocarbonate (IV)
23.
The green house effect is a climatic condition associated with the presence of excess
1. A.carbon (II) oxide
2. B.carbon (IV) oxide
3. C.hydrogen sulphide
4. D.nitrogen (II) oxide
5. E.oxygen
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Answer: B carbon (IV) oxide
24.
The Ideal Gas Law is expressed mathematically as
1. A.P1 /T1 = P2/T2
2. B.P1/V1 = P2V2
3. C.PV =nRT
4. D.PV =KT
5. E.V1/T1 = V2/T2
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Answer: C PV =nRT
25.
The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]
1. A.CH
2. B.C\(H _{3}\)
3. C.C\(H _{4}\)
4. D.\(C _{2} H _{2}\)
5. E.\(C _{2} H _{6}\)
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Answer: B C\(H _{3}\)
26.
The process involved in the decomposition of sugar by an enzyme is called
1. A.dehydration
2. B.esterification
3. C.fermentation
4. D.polymerization
5. E.saponification
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Answer: C fermentation
27.
The rate of a reaction usually increases with increase in the concentration of reactants because the
1. A.distance between particles of the reactants increases
2. B.frequency of collision of particles is lower
3. C.particles of the reactants gain energy and move faster
4. D.reactants from a complex which decomposes rapidly
5. E.reactants occupy a higher energy level
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Answer: D reactants from a complex which decomposes rapidly
28.
The reaction of an alkanol with alkanioc acid is known as
1. A.dehydration
2. B.esterification
3. C.halogenation
4. D.hydrogenation
5. E.saponification
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Answer: B esterification
29.
The relationship between equilibrium constant and free energy change is represented as
1. A.δ G ° =-nFE °
2. B.δG °-RT ln K
3. C.δ G °= + RT In k
4. D.δG ° = δH – T S
5. E.H=TδS
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Answer: B δG °-RT ln K
30.
The scientist who discovered the zig-zag movement of gas molecules is
1. A.Brownian
2. B.Dalton
3. C.Gay Lussac
4. D.Graham
5. E.Newton
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Answer: A Brownian
31.
Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding
1. A.covalent
2. B.dative
3. C.electrovalent
4. D.hydrogen
5. E.metallic
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Answer: C electrovalent
32.
What kind of bond exist between carbon and oxygen in C\(0_{3}\) ^{2-}?
1. A.Co- ordinate Covalent
2. B.covalent
3. C.Electrovalent
4. D.Metallic
5. E.Van der Waal forces
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Answer: B covalent
33.
What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]
1. A.0.32
2. B.0.64
3. C.3.18
4. D.6.35
5. E.9.65
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Answer: A 0.32
34.
What volume of carbon (IV) oxide in d\(m ^{3}\) is produced at s.t.p. when 2.50g of CaC\(O_{3}\) reacts with excess acid according to the following equation? CaC\(O_{3}(s) + 2\)HCI(aq) → CaC\(l_{2}(\)aq\() + H_{2}O(1) +\) C\(O_{2}(g)\) [CaC\(O_{2} 100\); molar volume of a gas at s.t.p. = 22.4d\(m ^{3}]\)
1. A.0.28
2. B.0.56
3. C.2.24
4. D.5.6
5. E.11.2
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Answer: B 0.56
35.
When air is passed through alkaline pyrogallol and then lime water, the gases left are
1. A.nitrogen and carbon (IV) oxide
2. B.nitrogen and noble gases
3. C.nitrogen and oxygen
4. D.nitrogen, carbon (VI) oxide and noble gases
5. E.the noble gases
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Answer: B nitrogen and noble gases
36.
Which of the following compounds will undergo thermal dissociation?
1. A.AgCl
2. B.CaC\(O _{3}\)
3. C.\(K _{2}\) S\(0 _{4}\)
4. D.NaOH
5. E.N\(H _{4}\) CI
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Answer: E N\(H _{4}\) CI
37.
Which of the following equations is NOT balanced?
1. A.C\(H _{4} (g) + 20 _{2} (9)\) → C\(O _{2} (g) + 2H _{2} O(g)\)
2. B.CU(S) + HN\(O _{3} (\)aq) → Cu(N\(O _{3} ) _{2} (\)aq\() + 4H _{2} O(I) +\) NO(g)
3. C.2KCI\(O _{3} (s)\) → 2KCI\((s)+ 3O _{2} (g)\)
4. D.NaH\((s) + H _{2} O(1)\) → NaOH(aq\() +H _{2} (g)\)
5. E.N\(a _{2}\) S\(O _{4} (\)aq) + BaC\(l _{2} (\)aq) → BaS\(O _{4} (s) + 2\)NaCl(aq)
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Answer: B CU(S) + HN\(O _{3} (\)aq) → Cu(N\(O _{3} ) _{2} (\)aq\() + 4H _{2} O(I) +\) NO(g)
38.
Which of the following gases is absorbed from the air due to photosynthesis?
1. A.Carbon (II) oxide
2. B.Carbon (IV) oxide
3. C.Nitrogen
4. D.Noble gases
5. E.Oxygen
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Answer: B Carbon (IV) oxide
39.
Which of the following gases will bleach moist litmus paper?
1. A.C\(l _{2}\)
2. B.C\(O _{2}\)
3. C.HCl
4. D.\(N _{2} O\)
5. E.S\(O _{3}\)
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Answer: A C\(l _{2}\)
40.
Which of the following is a solid at room temperature?
1. A.Argon
2. B.Bromine
3. C.Chlorine
4. D.Fluorine
5. E.Iodine
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Answer: E Iodine
41.
Which of the following is NOT a fraction of petroleum?
1. A.Bitumen
2. B.Coal
3. C.Diesel
4. D.Kerosene
5. E.Petrol
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Answer: B Coal
42.
Which of the following metals is NOT extracted by electrolysis?
1. A.Aluminium
2. B.Calcium
3. C.iron
4. D.Magnesium
5. E.Sodium
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Answer: C iron
43.
Which of the following non-metals reacts most readily with metals?
1. A.Carbon
2. B.Chlorine
3. C.Nitrogen
4. D.Phosphorus
5. E.Sulphur
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Answer: B Chlorine
44.
Which of the following salt solutions will have a pH greater than 7?
1. A.NaCl
2. B.NaHS\(O _{4}\)
3. C.N\(a _{2}\) C\(O _{4}\)
4. D.N\(a _{2}\) S\(O _{4}\)
5. E.MgC\(l _{2}\)
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Answer: C N\(a _{2}\) C\(O _{4}\)
45.
Which of the following statements is NOT correct of group VII elements? They
1. A.are diatomic
2. B.are good oxidizing agents
3. C.are highly electronegative
4. D.have high electron affinity
5. E.have relatively low ionization potentials
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Answer: E have relatively low ionization potentials
46.
Which of these compounds has the greatest ionic character?
1. A.Al\(F _{3}\)
2. B.B\(F _{2}\)
3. C.C\(F _{4}\)
4. D.CsF
5. E.NaF
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Answer: E NaF
47.
X = - lo\(g_{10} H^{+}]\) What does X stand for in the expression above?
1. A.Degree of acidity
2. B.Enthalpy change
3. C.Equilibrium constant
4. D.Ionic product of water
5. E.Solubility product
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Answer: A Degree of acidity

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