Chemistry past questions: JAMB UTME 2024

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

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

1.
\(^{14}_7\) N + X → \(^{14}_6\) C + \(^1_1\) P In the reaction above, X is
1. A.a proton
2. B.an alpha particle
3. C.a beta particle
4. D.a neutron
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Answer: D a neutron
2.
\(^{238}_{92}\) U + \(^1_0\) n → \(^{239}_{92}\) U The process above produces
1. A.atomic mutation
2. B.a radioactive isotope
3. C.other neutrons
4. D.radiations
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Answer: B a radioactive isotope
3.
COMPOUND S T U V W
FORMULA ROR' RCOOH' RCOR' ROH' RCOOR'
From the table above, which of these two compounds can form functional group isomers?
1. A.S and T
2. B.T and U
3. C.S and V
4. D.T and V
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Answer: A S and T
4.
127g of sodium chloride was dissolved in 1.0dm \(^3\) of distilled water at 25 \(^0\) C . Determine the solubility in moldm \(^{-3}\) of sodium chloride at that temperature. [Na = 23, Cl = 35.5]
1. A.1.0
2. B.2.0
3. C.2.2
4. D.4.1
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Answer: C 2.2
5.
25.0g of potassium chloride were dissolved in 80g of distilled water at 30 \(^0\) C. Calculate the solubility of the solute in mol dm \(^3\) . [K =39, Cl = 35.5]
1. A.3.9 moldm \(^3\)
2. B.4.6 moldm \(^3\)
3. C.4.0 moldm \(^3\)
4. D.4.2 moldm \(^3\)
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Answer: D 4.2 moldm \(^3\)
6.
A factor that does not affect the rate of a chemical reaction is
1. A.surface area
2. B.temperature
3. C.volume
4. D.catalyst
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Answer: B temperature
7.
A gas that turns lime water milky is likely to be from
1. A.Trioxocarbonate(IV)
2. B.Chloride
3. C.Trioxonitrate(V)
4. D.Tetraoxosulphate(VI)
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Answer: A Trioxocarbonate(IV)
8.
A gas when mixed with oxygen, it produces a very hot and early controllable flame. What is the name of the flame and where is it used?
1. A.Acetylene flame; miners' lamb
2. B.Oxy-ethylene ; hunters' torch
3. C.Oxy-ethylene flame; miners' lamb
4. D.Oxy-ethylene flame ; cutting and welding metals
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Answer: D Oxy-ethylene flame ; cutting and welding metals
9.
A liquid hydrocarbon obtained from fractional distillation of coal tar that is used in the pharmaceutical industry is
1. A.xylene
2. B.benzene
3. C.hexane
4. D.Toluene
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Answer: B benzene
10.
A major effect of oil pollution in coastal water is
1. A.destruction of aquatic life
2. B.nitrification of the water body
3. C.detoxification of water
4. D.disinfection of the water body
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Answer: C detoxification of water
11.
A radioactive element of mass 1g has half-life of 2 minutes, what fraction of the substance would have disintegrated after 10 minutes?
1. A.1/4
2. B.1/8
3. C.1/16
4. D.1/32
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Answer: D 1/32
12.
A type of isomerism that ClCH=CHCl can exhibit is
1. A.chain
2. B.positional
3. C.functional group
4. D.optical
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Answer: B positional
13.
A typical chemical reaction will be spontaneous if
1. A.enthalpy change is negative
2. B.free energy change is greater than one
3. C.entropy change is zero
4. D.enthalpy and free energy change are equal
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Answer: A enthalpy change is negative
14.
After breathing in a test tube that contains acidified K \(_2\) Cr \(_2\) O \(_7\) , a man noticed the change in the colour of K \(_2\) Cr \(_2\) O \(_7\) from orange to green. This suggests the presence of
1. A.alkanone
2. B.alkanal
3. C.alkanol
4. D.alkanoic acid
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Answer: C alkanol
15.
Alkanoates are naturally found in
1. A.lipids
2. B.vitamins
3. C.proteins
4. D.rubbers
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Answer: A lipids
16.
Alkylation of benzene is catalyzed by
1. A.palladium
2. B.nickel
3. C.sunlight
4. D.aluminium chloride
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Answer: D aluminium chloride
17.
An example of a compound that is acidic in solution is
1. A.H \(_3\) PO \(_4\)
2. B.NH \(_4\) Cl
3. C.Na \(_2\) CO \(_3\)
4. D.MgCl \(_2\)
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Answer: B NH \(_4\) Cl
18.
An example of a physical change is
1. A.exposing sodium metal to air
2. B.boiling of water
3. C.dissolving calcium metal in water
4. D.burning of kerosene
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Answer: B boiling of water
19.
An example of a substance that does not change directly from solid to gas when heated is
1. A.NH \(_4\) Cl \((_s\) )
2. B.I \(_2\) \((_s\) )
3. C.CaCO \(_3\) \((_s\) )
4. D.S \(_8\) \((_s\) )
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Answer: C CaCO \(_3\) \((_s\) )
20.
An example of an amphoteric oxide is
1. A.P \(_4\) O \(_{10}\)
2. B.Al \(_2\) O \(_3\)
3. C.CuO
4. D.K \(_2\) O
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Answer: B Al \(_2\) O \(_3\)
21.
An example of highly unsaturated hydrocarbon is
1. A.C \(_2\) H \(_2\)
2. B.CH \(_4\)
3. C.C \(_2\) H \(_4\)
4. D.C \(_4\) H \(_{10}\)
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Answer: A C \(_2\) H \(_2\)
22.
An organic compound contains 53.1% Carbon, 6.2% Hydrogen, 12.4% Nitrogen, and 28.3% Oxygen by mass. What is the molecular formula of the compound if its vapour density is 56.5? [ C =12, H = 1, N = 14, O = 16].
1. A.C \(_5\) H \(_7\) NO \(_2\)
2. B.C \(_5\) H \(_6\) NO \(_2\)
3. C.C \(_3\) H \(_6\) NO \(_2\)
4. D.C \(_3\) H \(_7\) NO \(_2\)
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Answer: A C \(_5\) H \(_7\) NO \(_2\)
23.
An organic compound with general formula RCOR' is an
1. A.alkanone
2. B.alkanal
3. C.alkanoate
4. D.alkanoic acid
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Answer: A alkanone
24.
An oxide of nitrogen that can rekindle a glowing splint is
1. A.nitrogen(I)oxide
2. B.nitrogen(II)oxide
3. C.nitrogen(IV)oxide
4. D.dinitrogen tetraoxide
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Answer: A nitrogen(I)oxide
25.
Aqueous solution of sodium hydroxide can be used to test for the presence of : I. Ca \(^{2+}\) , II. Zn \(^{2+}\) , III. Cu \(^{2+}\)
1. A.I only
2. B.I and III
3. C.I, II and III
4. D.I and II only
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Answer: C I, II and III
26.
At a given temperature and pressure, a gas X diffuses twice as fast as gas Y. It follows that
1. A.Gas Y is two times as heavy as Gas X
2. B.Gas Y is four times as heavy as Gas X
3. C.Gas Y is monoatomic
4. D.Gas X is diatomic
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Answer: D Gas X is diatomic
27.
Benzene formed nitrobenzene at temperature of 60 \(^0\) C when it reacts with mixture of concentrated trioxonitrate(V) acid and concentrated
1. A.phosphoric acid
2. B.hydrochloric acid
3. C.tetraoxosulphate(VI) acid
4. D.hydrogen iodide
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Answer: C tetraoxosulphate(VI) acid
28.
Biodegradable pollutants are not safe in water systems because they can cause
1. A.air pollution
2. B.soil degradation
3. C.ill health
4. D.greenhouse effect
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Answer: C ill health
29.
Biuret test is a chemical test used for detecting the presence of
1. A.carbohydrates
2. B.proteins
3. C.amines
4. D.alkanoates
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Answer: B proteins
30.
Boyle's law can be expressed mathematically as
1. A.PV = K
2. B.PV = RT
3. C.V =KT
4. D.\(\frac{V}{T}\) = K
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Answer: A PV = K
31.
C \(_2\) H \(_{4(g)}\) + 3O \(_{2(g)}\) → 2CO \(_{2(g)}\) + 2H \(_2\) O \(_{(g)}\) The above equation represents the combustion of ethene.If 10cm \(^3\) of ethene is burnt in 50cm \(^3\) of oxygen, what would be the volume of oxygen that would remain at the end of the reaction?
1. A.20cm \(^3\)
2. B.40cm \(^3\)
3. C.60cm \(^3\)
4. D.50cm \(^3\)
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Answer: A 20cm \(^3\)
32.
C \(_x\) H \(_y\) O + 5O \(_2\) → 4CO \(_2\) + 4H \(_2\) O C \(_x\) H \(_y\) O in the equation is
1. A.CH \(_2\) O
2. B.C \(_2\) H \(_6\) O
3. C.CH \(_4\) O
4. D.C \(_2\) H \(_4\) O
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Answer: D C \(_2\) H \(_4\) O
33.
Calculate the mass of Magnesium that will be liberated from its salt by the same quantity of electricity that liberated 16.0 g of Silver. [Mg = 24.0, Ag = 108 ]
1. A.3.65 g
2. B.3.56 g
3. C.1.87 g
4. D.1.78 g
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Answer: D 1.78 g
34.
Calculate the number of moles of Copper that will be deposited, if 2 Faraday of electricity is passed through the copper during the electrolysis of copper(II)tetraoxosulphate(VI) [1F = 96500C ]
1. A.0.5 mole
2. B.1.0 mole
3. C.2.0 moles
4. D.3.0 moles
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Answer: B 1.0 mole
35.
CH \(_3\) -CH \(_2\) -OH and CH \(_3\) -O-CH \(_3\) The relationship between the two compounds above, is that they are
1. A.allotropes
2. B.isotopes
3. C.isomers
4. D.isobars
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Answer: C isomers
36.
Concentrated sodium chloride solution is electrolyzed using mercury cathode and graphite anode. The products at the anode and the cathode respectively are
1. A.hydrogen and chlorine
2. B.chlorine and hydrogen
3. C.chlorine and sodium
4. D.sodium and chlorine
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Answer: C chlorine and sodium
37.
CuO \(_s\) + H \(_2\) ( \(_g\) ) ⇌ Cu \(_s\) + H \(_2\) O( \(_g\) ) In the equation above, the effect of increased pressure on the equilibrium position is that
1. A.the equilibrium is shifted to the left
2. B.the equilibrium is shifted to the right
3. C.there is no effect
4. D.more H \(_2\) \((g\) ) is produced
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Answer: D more H \(_2\) \((g\) ) is produced
38.
Determine the empirical formula of an oxide of sulphur containing 60% of oxygen [S = 32, O = 16 ]
1. A.SO \(_3\)
2. B.SO \(_2\)
3. C.SO \(_4\)
4. D.SO
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Answer: A SO \(_3\)
39.
Determine the half-life of a first order reaction with constant 4.5 x 10 \(^{-3}\) sec \(^{-1}\) .
1. A.154 s
2. B.15.4 s
3. C.1540 s
4. D.1.54 s
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Answer: B 15.4 s
40.
During the fractional distillation of crude oil, the fraction that distills at 200 - 250 \(^0\) C is
1. A.bitumen
2. B.diesel
3. C.kerosene
4. D.petrol
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Answer: C kerosene
41.
Esterification reaction is analogous to
1. A.oxidation reaction
2. B.neutralization reaction
3. C.condensation reaction
4. D.hydrolysis reaction
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Answer: C condensation reaction
42.
Fats and oils are esters of fatty organic acids combined with a trihydric alkanol commonly referred to as
1. A.ethanol
2. B.methanol
3. C.glycol
4. D.glycerol
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Answer: D glycerol
43.
Fog is a colloid in which
1. A.liquid particles is dispersed in a gas medium
2. B.gas particles dispersed in a liquid medium
3. C.solid particles dispersed in a gas medium
4. D.gas particles dispersed in a solid medium
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Answer: C solid particles dispersed in a gas medium
44.
For chemical reaction to be spontaneous, ∆G must be
1. A.positive
2. B.negative
3. C.zero
4. D.equal to the enthalpy change
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Answer: B negative
45.
H \(_2\) S \(_{(g)}\) + Cl \(_2\) \(_{(g)}\) → 2HCl \(_{(g)}\) + S \(_{(s)}\) What is the change in oxidation state of sulphur from reactant to product?
1. A.-3 to -1
2. B.-3 to 1
3. C.-2 to 0
4. D.-1 to 0
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Answer: C -2 to 0
46.
H \(_2\) SO \(_4\) C \(_2\) H \(_5\) OH → C \(_2\) H \(_4\) 170 \(^0\) C The reaction above illustrates
1. A.oxidation
2. B.esterification
3. C.dehydration
4. D.polymerization
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Answer: C dehydration
47.
Heat of solution involves two steps that is accompanied by heat change. The energies involved in this steps are
1. A.lattice energy and hydration energy
2. B.lattice energy and ionic energy
3. C.Heat energy and lattice energy
4. D.hydration energy and heat energy
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Answer: D hydration energy and heat energy
48.
How many isomers has the organic compound represented by the formula C \(_3\) H \(_8\) O ?
1. A.2
2. B.3
3. C.4
4. D.5
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Answer: B 3
49.
How many moles of CO \(_2\) are produced when ethanol is burnt with 6g of oxygen
1. A.0.125
2. B.0.250
3. C.0.375
4. D.0.750
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Answer: A 0.125
50.
How much of 5g of radioactive element whose half life is 50days remains after 200days?
1. A.2.50 g
2. B.1.25 g
3. C.0.63 g
4. D.0.31 g
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Answer: D 0.31 g
51.
Hydrochloric acid is not suitable in the preparation of ethanoic acid because it
1. A.is too acidic
2. B.is too volatile
3. C.can attack cork and rubber used as containers
4. D.turns blue litmus red
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Answer: B is too volatile
52.
Hydrochloric acid is regarded as a strong acid because it
1. A.ionizes partially
2. B.ionizes completely
3. C.is a mineral acid
4. D.reacts with a base
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Answer: B ionizes completely
53.
Hydrogen chloride gas and ammonia can be used to demonstrate the fountain experiment because they are
1. A.light
2. B.volatile
3. C.very soluble in water
4. D.heavy gases
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Answer: C very soluble in water
54.
If 11.0g of a gas occupies 5.6 dm \(^3\) at s.t.p., calculate its vapour density (1 mole of a gas occupies 22.4 dm \(^3\) ).
1. A.22
2. B.44
3. C.66
4. D.88
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Answer: A 22
55.
If a salt weighs 2g and upon exposure to the atmosphere weighs 1.5g, this is as a result of
1. A.hygroscopy
2. B.effervescence
3. C.efflorescence
4. D.deliquescence
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Answer: B effervescence
56.
If a stable neutral atom has a mass number of 31, the number of electrons and neutrons respectively are
1. A.15 and 16
2. B.16 and 31
3. C.15 and 31
4. D.16 and 15
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Answer: A 15 and 16
57.
If the solubility of KNO \(_3\) at 30 \(^0\) C is 3.10 mol/dm \(^3\) a solution containing 303g/dm \(^3\) KNO \(_3\) is likely to be
1. A.saturated
2. B.unsaturated
3. C.supersaturated
4. D.at saturation point
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Answer: B unsaturated
58.
In a chemical reaction, surface area of reactants can affect
1. A.CaCO \(_3\) + 2HCl → CaCl \(_2\) + H \(_2\) O + CO \(_2\)
2. B.MgCl \(_2\) + H \(_2\) SO \(_4\) → MgSO \(_4\) + 2HCl
3. C.H \(_2\) + Cl \(_2\) → 2HCl
4. D.NaOH + HCl → NaCl + H \(_2\) O
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Answer: A CaCO \(_3\) + 2HCl → CaCl \(_2\) + H \(_2\) O + CO \(_2\)
59.
In contact process, the catalyst used in the conversion of sulphur(IV)oxide to sulphur(VI) oxide is
1. A.nickel
2. B.platinum
3. C.vanadium(V)oxide
4. D.magnesium(IV)oxide
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Answer: A nickel
60.
In the conductance of aqueous CuSO \(_4\) solution, the current carriers are the
1. A.mobile electrons
2. B.metallic ions
3. C.hydrated ions
4. D.hydrated electrons
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Answer: C hydrated ions
61.
In the extraction of Aluminium, the silica impurity is removed by
1. A.electrolysis
2. B.filtration
3. C.reaction with H \(_2\) SO \(_4\)
4. D.precipitation
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Answer: B filtration
62.
In the graph above, y represents
1. A.endothermic reaction
2. B.activation energy
3. C.exothermic reaction
4. D.ionization energy
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Answer: B activation energy
63.
In the treatment of water for municipal supply, chlorine is used to
1. A.prevent tooth decay
2. B.prevent goitre
3. C.kill germs
4. D.remove colour or odour
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Answer: C kill germs
64.
Kerosene is used as solvent for
1. A.Paints
2. B.Sulphur
3. C.Gums
4. D.Fats
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Answer: A Paints
65.
Na \(_2\) X ⇌ 2Na \(^+\) + X \(^{2-}\) The bond between Na and X is likely to be
1. A.covalent
2. B.dative
3. C.ionic
4. D.metallic
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Answer: C ionic
66.
Nitrogen obtained from air is not absolutely pure because it contains the following except
1. A.oxygen
2. B.carbon (IV)oxide
3. C.inert gases
4. D.water vapour
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Answer: B carbon (IV)oxide
67.
One of the following is not a water pollutant?
1. A.Inorganic fertilizers
2. B.Warm water affluent
3. C.Oxygen gas
4. D.Biodegradable waste
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Answer: C Oxygen gas
68.
Rust on the surface of a metal sheet contains
1. A.hydrated iron(II)oxide
2. B.hydrated iron(III)oxide
3. C.iron(III)hydroxide
4. D.iron(III) trioxocarbonate(IV)
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Answer: B hydrated iron(III)oxide
69.
Scandium is not regarded as a transition metal because its ion has
1. A.no electron in the d-orbital
2. B.a partially filled d-orbitals
3. C.a completely filled 4S orbital
4. D.a partially filled 4S orbital
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Answer: B a partially filled d-orbitals
70.
Silver and Gold are metals found as free uncombined elements in the earth's crust, which makes them to be referred to as
1. A.corrosive metals
2. B.reactive metals
3. C.natural metals
4. D.noble metals
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Answer: D noble metals
71.
Solubility curve is a plot of solubility against
1. A.temperature
2. B.pressure
3. C.volume
4. D.concentrate
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Answer: A temperature
72.
Strong acids can be distinguished from weak acids by any of the following methods, EXCEPT
1. A.Conductivity measurement
2. B.The use of litmus paper
3. C.Measurement of pH
4. D.Measurement of heat of reaction
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Answer: A Conductivity measurement
73.
Sulphur(IV)oxide can be used as a
1. A.coating agent
2. B.dehydrating agent
3. C.refrigerant
4. D.drying agent
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Answer: C refrigerant
74.
The amount of Faraday required to discharge 4.5 moles of Al \(^{3+}\) is
1. A.13.5
2. B.4.5
3. C.7.5
4. D.1.5
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Answer: A 13.5
75.
The amount of water a substance chemically combined with is called water of
1. A.dehydration
2. B.solution
3. C.hydration
4. D.crystallization
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Answer: D crystallization
76.
The basicity of tetraoxophosphate(V) acid is
1. A.1
2. B.4
3. C.2
4. D.3
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Answer: D 3
77.
The chemical formula for potassiumhexacyanoferrate(II) is
1. A.[Fe(CN) \(_6\) ] \(^{4-}\)
2. B.K \(_3\) Fe(CN) \(_6\)
3. C.Fe(CN) \(_6\)
4. D.K \(_4\) Fe(CN) \(_6\)
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Answer: D K \(_4\) Fe(CN) \(_6\)
78.
The combustion of candle under limited supply of air forms
1. A.water and CO \(_2\)
2. B.water and CO
3. C.soot and CO
4. D.soot and CO \(_2\)
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Answer: C soot and CO
79.
The composition of alloy permalloy is iron and
1. A.copper
2. B.nickel
3. C.lead
4. D.magnesium
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Answer: A copper
80.
The compound of Copper used as a fungicide is
1. A.CuCO \(_3\)
2. B.Cu(NO \(_3\) ) \(_2\)
3. C.CuSO \(_4\)
4. D.CuCl \(_2\)
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Answer: C CuSO \(_4\)
81.
The constituent of petroleum fraction used in surfacing road is
1. A.petrol
2. B.diesel
3. C.lubricating oil
4. D.bitumen
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Answer: D bitumen
82.
The constituents of Alnico are Aluminium, Nickel and
1. A.Mg
2. B.Co
3. C.Mn
4. D.Cu
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Answer: C Mn
83.
The difference in molecular mass between an alkene and alkyne with six carbon per mole is
1. A.10
2. B.12
3. C.2
4. D.14
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Answer: C 2
84.
The electronic configuration of an atom of Nitrogen is 1s \(^2\) 2s \(^2\) 2p \(^1_x\) 2p \(^1_y\) 2p \(^1_z\) because the atom is
1. A.in an excited state
2. B.undergoing energy changes
3. C.unstable and ready to combine with another
4. D.simply obeying rules governing electron configuration
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Answer: D simply obeying rules governing electron configuration
85.
The element which can combine with oxygen to form an acid anhydride of the form XO \(_2\) is
1. A.phosphorus
2. B.Chlorine
3. C.fluorine
4. D.sulphur
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Answer: D sulphur
86.
The empirical formula of an organic liquid hydrocarbon is XY. If the relative molar masses of X and Y are 72 and 6 respectively, it's vapour density is likely to be
1. A.33
2. B.66
3. C.39
4. D.78
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Answer: C 39
87.
The general molecular formula C \(_n\) H \(_{2n-2}\) represents that of an
1. A.alkyne
2. B.alkene
3. C.alkane
4. D.alkanal
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Answer: A alkyne
88.
The group VIII elements are the inert gases because they
1. A.have lone pair of electrons on their valence shells
2. B.all have completely filled valence shells
3. C.are all solids
4. D.are all polyatomic molecules
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Answer: B all have completely filled valence shells
89.
The highest isotope of hydrogen is
1. A.Deuterium
2. B.protium
3. C.tritium
4. D.positron
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Answer: C tritium
90.
The hybridization scheme in ethyne is
1. A.sp
2. B.sp \(^3\)
3. C.sp \(^2\) d
4. D.sp \(^2\) s
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Answer: A sp
91.
The indicator used in a titration between strong acid and weak base is
1. A.methyl orange
2. B.phenolphthalein
3. C.bromothymol blue
4. D.methyl red
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Answer: A methyl orange
92.
The ions responsible for permanent hardness in water are sulphates of
1. A.Fe \(^{3+}\) and Mg \(^{2+}\)
2. B.Ca \(^{2+}\) and Mg \(^{2+}\)
3. C.Fe \(^{2+}\) and Fe \(^{3+}\)
4. D.Na \(^{+}\) and Ca \(^{2+}\)
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Answer: B Ca \(^{2+}\) and Mg \(^{2+}\)
93.
The IUPAC name of the compound above is
1. A.3-methyl, 3-bromo butane
2. B.2-methyl, 2-bromo butane
3. C.2-bromo, 2-methyl butane
4. D.3-bromo, 3-methyl butane
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Answer: C 2-bromo, 2-methyl butane
94.
The IUPAC Nomenclature of CH \(_3\) CH \(_2\) C(CH \(_3\) )=C(CH \(_3\) ) \(_2\) for the compound is
1. A.2,3-dimethylpentene
2. B.2,3-dimethylpent-2-ene
3. C.3,4-dimethylpent-3-ene
4. D.3,4-dimethylpentene
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Answer: B 2,3-dimethylpent-2-ene
95.
The IUPAC nomenclature of the complex K \(_4\) Fe(CN) \(_6\) is
1. A.potassium hexacyanoferrate(II)
2. B.potassium hexacyanoferrate(III)
3. C.potassium hexacyanoferrate(IV)
4. D.potassium hexacyanoferrate(VI)
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Answer: A potassium hexacyanoferrate(II)
96.
The IUPAC nomenclature of the compound above is
1. A.propan-1-ol
2. B.butan-1-ol
3. C.2-methyl propan-1-ol
4. D.2-methyl propan-2-ol
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Answer: C 2-methyl propan-1-ol
97.
The law which states that a pure chemical compound, no matter how it is made, will be made up of the same elements contained in the same proportion by mass is
1. A.law of conservation of masses
2. B.law of definite proportion
3. C.law of multiple proportion
4. D.law of reciprocal proportion
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Answer: B law of definite proportion
98.
The main constituent of water-glass is
1. A.calcium trioxosilicate(IV)
2. B.calcium trioxosulphate(IV)
3. C.sodium trioxosulphate(IV)
4. D.sodium trioxosilicate(IV)
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Answer: A calcium trioxosilicate(IV)
99.
The molecular formular of a hydrocarbon with an empirical formula of CH \(_3\) and a molar mass of 30 is
1. A.C \(_2\) H \(_4\)
2. B.C \(_3\) H \(_3\)
3. C.C \(_2\) H \(_6\)
4. D.C \(_6\) H \(_6\)
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Answer: D C \(_6\) H \(_6\)
100.
The number of geometrical isomers of butene are
1. A.2
2. B.3
3. C.5
4. D.4
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Answer: B 3
101.
The number of molecules of helium gas contained in 11.5g of the gas is
1. A.1.73 x 10 \(^{23}\)
2. B.1.73 x 10 \(^{22}\)
3. C.1.73 x 10 \(^{24}\)
4. D.1.73 x 10 \(^{21}\)
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Answer: C 1.73 x 10 \(^{24}\)
102.
The percentage of carbon(IV) oxide in air is
1. A.0.01
2. B.0.02
3. C.0.05
4. D.0.03
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Answer: B 0.02
103.
The percentage of hydrogen in the sixth member of the class of the aliphatic alkanes is [H =1, C =12 ]
1. A.41.34
2. B.59.54
3. C.16.28
4. D.83.72
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Answer: C 16.28
104.
The pH of a 0.001 mol dm \(^{-3}\) of H \(_2\) SO \(_4\) is [Log \(_{10}\) 2 = 0.3]
1. A.2.7
2. B.3.0
3. C.3.3
4. D.2.0
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Answer: A 2.7
105.
The principle which states that no two electrons in the same orbitals of an atom have same value for all four quantum numbers is the
1. A.Aufbau principle
2. B.Hund's rule
3. C.Pauli Exclusion principle
4. D.Dilution principle
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Answer: C Pauli Exclusion principle
106.
The product formed when ethyne is passed through a hot tube containing finely divided iron is
1. A.polymeric
2. B.saturated
3. C.hydrated
4. D.aromatic
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Answer: D aromatic
107.
The quantity of electricity required to deposit 180g of Ag from a molten silver trioxonitrate(V) is [Ag = 108]
1. A.1.08F
2. B.3.30F
3. C.1.67F
4. D.1.80F
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Answer: A 1.08F
108.
The reaction between alkanoic acids and alkanols in the presence of an acid catalyst is known as
1. A.saponification
2. B.dehydration
3. C.esterification
4. D.hydrolysis
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Answer: C esterification
109.
The reaction of hydrogen and chlorine to produce hydrogen chloride gas is explosive in
1. A.diffused light
2. B.sunlight
3. C.infrared light
4. D.Raman light
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Answer: B sunlight
110.
The salt formed when strong acid reacts with strong base is
1. A.normal
2. B.double
3. C.complex
4. D.basic
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Answer: A normal
111.
The scientist that performed the experiment on discharged tubes that led to the discovery of the cathode rays as a sub-atomic particle is
1. A.J.J Thomson
2. B.Robert Millikan
3. C.Ernest Rutherford
4. D.Niels Bohr
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Answer: A J.J Thomson
112.
The shape of ammonia molecule is
1. A.V-Shaped or bent
2. B.Tetrahedral
3. C.co-plannar
4. D.trigonal
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Answer: D trigonal
113.
The shape of the molecule of Carbon(IV) oxide is
1. A.tetrahedral
2. B.pyramidal
3. C.plannar
4. D.linear
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Answer: D linear
114.
The stability of atomic nucleus is determined by ratio of
1. A.Neutron/electron
2. B.Neutron/proton
3. C.positron/neutron
4. D.electron/proton
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Answer: B Neutron/proton
115.
The substance that reacts with sodium to form alkali and changes white anhydrous copper(II) tetraoxosulphate (VI) to blue is
1. A.base
2. B.acid
3. C.water
4. D.solvent
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Answer: C water
116.
The table above shows the formulae of some ions. In which of these compounds is the formula not correct?
1. A.Aluminiumtetraoxosulphate(VI), Al \(_2\) (SO \(_4\) ) \(_3\)
2. B.Calciumtrioxonitrate(V), Ca(NO \(_3\) ) \(_2\)
3. C.Iron(III)bromide, Fe \(_3\) Br
4. D.Potassiumsulphide, K \(_2\) S
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Answer: D Potassiumsulphide, K \(_2\) S
117.
The term strong and weak acids is used to indicate the
1. A.number of H \(^+\) released by an acid
2. B.number of OH \(^-\) released by an acid
3. C.extent of ionization of an acid
4. D.strength of its action on substance
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Answer: C extent of ionization of an acid
118.
The term that is not associated with petroleum industry is ?
1. A.Cracking
2. B.Saponification
3. C.Polymerization
4. D.Fermentation
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Answer: A Cracking
119.
The Van der waals forces of attraction operates between
1. A.atoms
2. B.cations
3. C.molecules
4. D.anions
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Answer: C molecules
120.
The volume in cm \(^3\) of a 0.12 moldm \(^{-3}\) HCl required to completely neutralize a 20cm \(^3\) of 0.20 moldm \(^{-3}\) of NaOH is
1. A.12.00
2. B.0.0012
3. C.33.33
4. D.2.40
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Answer: C 33.33
121.
The volume occupied by 1 mole of an ideal gas at a temperature of 13 \(^0\) C and a pressure of 1.58 atm is [ R = 0.082 atm dm \(^3\) K \(^{-1}\) mol \(^{-1}\) ]
1. A.14.84 dm \(^3\)
2. B.14.84 cm \(^3\)
3. C.0.64 dm \(^3\)
4. D.0.64 cm \(^3\)
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Answer: A 14.84 dm \(^3\)
122.
Water gas obtained from the gasification of coke is made up of
1. A.Nitrogen and Carbon(II) oxide
2. B.Nitrogen and Hydrogen
3. C.Hydrogen and Carbon(II) oxide
4. D.Carbon(II)oxide and Carbon(IV)oxide
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Answer: C Hydrogen and Carbon(II) oxide
123.
What accounts for the low melting and boiling points of covalent molecules?
1. A.They have weak intermolecular forces
2. B.They are three-dimensional structures
3. C.They have definite shapes
4. D.They possess shared electron pairs
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Answer: A They have weak intermolecular forces
124.
What is formed when metal reacts with acid to liberate gas?
1. A.Salt
2. B.Base
3. C.Acid
4. D.Liquid
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Answer: A Salt
125.
What is the vapour density of 560cm \(^3\) of a gas that weighs 0.4g at s.t.p? [Molar Volume of gas at s.t.p = 22.4 dm \(^3\) ]
1. A.6.0
2. B.8.0
3. C.16.0
4. D.32.0
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Answer: B 8.0
126.
What method is suitable for the separation of gases present in air?
1. A.Catalytic cracking of liquid air
2. B.Fractional distillation of liquid air
3. C.Thermal decomposition of air
4. D.Catalytic decomposition of air
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Answer: B Fractional distillation of liquid air
127.
What would be the order of the electrolytic cell in an industry intending the production of silver plated spoons?
1. A.Cathode is the spoon; anode is a silver rod; electrolyte is a soluble silver salt
2. B.Cathode is a silver rod; anode is the spoon; electrolyte is a soluble silver salt
3. C.Cathode is the spoon; anode is any rod; electrolyte is a soluble silver salt
4. D.Cathode is any rod; anode is the spoon; electrolyte is a soluble salt
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Answer: A Cathode is the spoon; anode is a silver rod; electrolyte is a soluble silver salt
128.
When a few drops of Millon reagents is added to egg-white solution in a test tube, the white precipitate changes to
1. A.orange
2. B.brick red
3. C.reddish brown
4. D.blue
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Answer: C reddish brown
129.
When a specie undergoes oxidation, its
1. A.oxidation number increases
2. B.oxidation number decreases
3. C.oxidation number remains constant
4. D.acts as oxidizing agent
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Answer: B oxidation number decreases
130.
When Calcium ethynide is decomposed by water, the gas produced is
1. A.CO
2. B.H \(_2\)
3. C.C \(_2\) H \(_2\)
4. D.CH \(_4\)
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Answer: C C \(_2\) H \(_2\)
131.
When n = 3, the quantum number of an element is
1. A.3
2. B.9
3. C.18
4. D.21
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Answer: B 9
132.
When Sulphur(IV)oxide is passed into solution of acidified tetraoxomanganate(VII), the colour changes from
1. A.blue to green
2. B.pink to yellow
3. C.purple to colourless
4. D.Orange to green
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Answer: C purple to colourless
133.
When the subsidiary quantum numbers (l) equals 1, the shape of the orbital is
1. A.spherical
2. B.dumb-bell
3. C.flat
4. D.round
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Answer: B dumb-bell
134.
Which of the following is an air pollutant?
1. A.O \(_2\)
2. B.CO
3. C.H \(_2\) O \((_g\) )
4. D.O \(_3\)
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Answer: B CO
135.
Which of the following is used in forming slag in the blast furnace for the extraction of iron?
1. A.Ca(CO \(_3\) ) \(_2\)
2. B.Ca(OH) \(_2\)
3. C.CaCO \(_3\)
4. D.CaO
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Answer: C CaCO \(_3\)
136.
Which of the following represents an order of increasing reactivity?
1. A.Au < Cu < Sn < Fe < Ca
2. B.Ca < Fe < Sn < Cu < Au
3. C.Au < Cu < Fe < Sn < Ca
4. D.Ca < Sn < Fe < Cu < Au
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Answer: A Au < Cu < Sn < Fe < Ca
137.
Which of these is the most preferred separation technique for the isolation of solutes where the purity of the constituent is of utmost importance?
1. A.sieving
2. B.Distillation
3. C.recrystallization
4. D.Precipitation
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Answer: C recrystallization

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