Chemistry past questions: JAMB UTME 2025

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

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

1.
(CH \(_3\) ) \(_2\) CHCH(OH)CH \(_2\) C(CH \(_3\) ) \(_3\) The IUPAC name of the compound above is
1. A.2,5,5-trimethylhexan-3-ol
2. B.1,1-dimethylisopentanol
3. C.1,1,4,4-pentamethylbutanol
4. D.2,5-dimethylhexan-4-ol
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Answer: A 2,5,5-trimethylhexan-3-ol
2.
2Na + Cl \(_2\) → 2NaCl In the reaction above, the specie that undergoes reduction is
1. A.Na
2. B.NaCl
3. C.Cl \(^-\)
4. D.Cl \(_2\)
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Answer: D Cl \(_2\)
3.
2SO \(_2\) \(_{(s)}\) + O \(_2\) \(_{(s)}\) ⇌ 2SO \(_3\) ; ΔG° = - ve For the above reaction to be feasible
1. A.ΔH = + ve ,ΔS = + ve
2. B.ΔH = 0 ,ΔS = + ve
3. C.ΔH = + ve ,ΔS = - ve
4. D.ΔS = 0
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Answer: A ΔH = + ve ,ΔS = + ve
4.
2X + 2HCl → 2XCl + H \(_2\) In the equation above, X is
1. A.K
2. B.Mg
3. C.Ca
4. D.Ba
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Answer: A K
5.
A by-product of the alkaline hydrolysis of tristearin is a
1. A.dihydric alkanol
2. B.tertiary alkanol
3. C.secondary alkanol
4. D.trihydric alkanol
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Answer: D trihydric alkanol
6.
A metal that can be found in the free state in nature is
1. A.silver
2. B.Zinc
3. C.Iron
4. D.copper
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Answer: A silver
7.
A molecule with a polar covalent bond between atoms exhibits
1. A.unequal sharing of electron pair
2. B.equal sharing of electron pair
3. C.equal sharing of electron lone pair
4. D.unequal sharing of electron lone pair
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Answer: A unequal sharing of electron pair
8.
A table in which metals are arranged in series according to their comparative tendencies to give up their valence electrons is
1. A.periodic table
2. B.electrochemical series
3. C.table of elements
4. D.periodicals
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Answer: B electrochemical series
9.
Acid radicals are present in
1. A.CO \(_3\) \(^{2-}\) , PO \(_4\) \(^{3-}\) , Mg \(^{2+}\)
2. B.CO \(_3\) \(^{2-}\) , SO \(_4\) \(^{2-}\) , Na \(^+\)
3. C.CO \(_3\) \(^{2-}\) , SO \(_4\) \(^{2-}\) , NO \(_3\) \(^-\)
4. D.CO \(_3\) \(^{2-}\) , SO \(_4\) \(^{2-}\) , K \(^+\)
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Answer: C CO \(_3\) \(^{2-}\) , SO \(_4\) \(^{2-}\) , NO \(_3\) \(^-\)
10.
After breathing in a test tube that contains acidified K \(_2\) Cr \(_2\) O \(_7\) , a man noticed a change in the colour of the acidified K \(_2\) Cr \(_2\) O \(_7\) from orange to green. This suggests the presence of
1. A.alkanoic acid
2. B.alkanal
3. C.alkanol
4. D.alkanone
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Answer: C alkanol
11.
Alkanoic acids have higher boiling points than alkanols because
1. A.alkanoic acids are more volatile than alkanols
2. B.alkanols are more polar than alkanoic acids
3. C.alkanoic acids are larger molecules
4. D.alkanoic acids form stronger hydrogen bonds
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Answer: C alkanoic acids are larger molecules
12.
Alkenes are represented with the general molecular formula
1. A.C \(_n\) H \(_{2n}\)
2. B.C \(_n\) H \(_{2n-2}\)
3. C.C \(_n\) H \(_{2n+2}\)
4. D.C \(_n\) H \(_{2n+1}\) OH
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Answer: D C \(_n\) H \(_{2n+1}\) OH
13.
An atom of element with the configuration 1S \(^2\) 2S \(^2\) 2P \(^6\) 3S \(^2\) 3P \(^5\) is likely to belong to
1. A.group 7
2. B.group 5
3. C.group 2
4. D.group 3
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Answer: A group 7
14.
An example of a physical change is
1. A.addition of water to calcium oxide
2. B.corrosion of iron
3. C.dissolving sodium chloride in water
4. D.burning of charcoal
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Answer: C dissolving sodium chloride in water
15.
An example of a salt that can dissolve in water to form a solution with a pH of 7.
1. A.sodium chloride
2. B.ammonium chloride
3. C.ammonium tetraoxosulphate(VI)
4. D.sodium trioxocarbonate(IV)
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Answer: A sodium chloride
16.
An example of an alkaline gas is
1. A.HCl
2. B.N \(_2\)
3. C.NH \(_3\)
4. D.NO \(_2\)
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Answer: C NH \(_3\)
17.
An importance of solubility is that it
1. A.determines the amount of solute that can dissolve in a given amount of solvent
2. B.lowers the vapour pressure of the liquid
3. C.enables us to know the chemical reactions of the gas with the liquid
4. D.raises the boiling point of liquid
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Answer: A determines the amount of solute that can dissolve in a given amount of solvent
18.
An inflated balloon shrinks when placed in a freezer because the
1. A.volume of gas increases and expands
2. B.number of gas molecules decreases
3. C.gas motion reduces and exert less pressure
4. D.gas molecules completely stop moving
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Answer: C gas motion reduces and exert less pressure
19.
Anti-freeze used in a vehicle radiator is a mixture of water and
1. A.propanetriol
2. B.propanol
3. C.propanone
4. D.propanal
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Answer: C propanone
20.
Atom with the electron configuration of 1S \(^2\) 2S \(^2\) 2P \(^6\) 3S \(^2\) belongs to
1. A.Group 3 and Period 2
2. B.Group 8 and Period 3
3. C.Group 2 and Period 3
4. D.Group 2 and Period 6
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Answer: C Group 2 and Period 3
21.
Bronze is used in making
1. A.musical instruments and ornaments
2. B.coins and medals
3. C.electromagnets and cutlery
4. D.aircrafts and ship
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Answer: B coins and medals
22.
C \(_2\) H \(_5\) OH + CH \(_3\) COOH ⇌ CH \(_3\) COOC \(_2\) H \(_5\) + H \(_2\) O The reaction above is
1. A.condensation
2. B.fermentation
3. C.esterification
4. D.hydrolysis
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Answer: B fermentation
23.
Calculate the pH of 0.001M KOH solution.
1. A.11
2. B.14
3. C.12
4. D.3
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Answer: A 11
24.
Calculate the time required to liberate 9g of Aluminium metal, when a current of 18A is passed through it. (1F = 96500C , Al = 27)
1. A.1769.17 minutes
2. B.89.34 minutes
3. C.5360.58 minutes
4. D.29.48 minutes
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Answer: B 89.34 minutes
25.
Carbohydrates can generally be represented by the general formula C \(_x\) (H \(_2\) O) \(_y\) , for fructose the value for "X" is
1. A.3
2. B.12
3. C.5
4. D.6
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Answer: D 6
26.
CH \(_3\) - CH \(_2\) - COOCH \(_2\) - CH \(_3\) From the condensed structure above, the reactants are
1. A.ethanol and ethanoic acid
2. B.propanol and propanoic acid
3. C.propanol and ethanoic acid
4. D.propanoic acid and ethanol
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Answer: D propanoic acid and ethanol
27.
CH \(_3\) C ≡ CCH(CH \(_3\) ) \(_2\) The IUPAC nomenclature of the compound above is
1. A.3-ethyl but-2-yne
2. B.4-methylpent-2-yne
3. C.2-ethyl but-2-yne
4. D.2-methyl pent-2-yne
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Answer: B 4-methylpent-2-yne
28.
Commercial deodorant is an example of a colloid called
1. A.aerosol
2. B.sol
3. C.foam
4. D.emulsion
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Answer: A aerosol
29.
Electron configuration of Chlorine atom is
1. A.1S \(^2\) 2S \(^2\) 2P \(^6\) 3S \(^2\) 3P \(^5\)
2. B.1S \(^2\) 2S \(^2\) 2P \(^6\) 3S \(^2\) 3P \(^4\)
3. C.1S \(^2\) 2S \(^2\) 2P \(^6\) 3S \(^2\) 3P \(^6\)
4. D.1S \(^2\) 2S \(^2\) 2P \(^5\) 3S \(^2\) 3P \(^6\)
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Answer: A 1S \(^2\) 2S \(^2\) 2P \(^6\) 3S \(^2\) 3P \(^5\)
30.
Enzymatic conversion of glucose to ethanol is
1. A.polymerization
2. B.hydrogenation
3. C.fermentation
4. D.saponification
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Answer: C fermentation
31.
Find the hydrogen ion, H \(^+\) concentration and hydroxide ion, OH \(^-\) concentration in 0.06 moldm \(^{-3}\) solution of H \(_2\) SO \(_4\) .
1. A.1.2 x 10 \(^{-2}\) ; 8.3 x 10 \(^{-13}\)
2. B.1.2 x 10 \(^{-1}\) ; 8.3 x 10 \(^{-13}\)
3. C.1.2 x 10 \(^{-1}\) ; 8.3 x 10 \(^{-14}\)
4. D.1.2 x 10 \(^{-2}\) ; 8.3 x 10 \(^{-14}\)
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Answer: C 1.2 x 10 \(^{-1}\) ; 8.3 x 10 \(^{-14}\)
32.
Freons pollution in the air are released from
1. A.fossil fuel
2. B.aerosol can
3. C.photosynthesis
4. D.organic decay
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Answer: C photosynthesis
33.
From the graph, it can be inferred that
1. A.the solubility of X and Y is the same at all temperature
2. B.the solubility of X, Y and Z is temperature dependent
3. C.solubility of Z increases as temperature increases
4. D.solubility of Y increases steadily as temperature increases
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Answer: D solubility of Y increases steadily as temperature increases
34.
Gold does not require extraction because it is
1. A.a precious mineral
2. B.inert
3. C.free in nature
4. D.neutral
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Answer: C free in nature
35.
How many molecules are there in 4.0 moles of glucose? [Avogadro's number = 6.02 x 10 \(^{23}\) ]
1. A.1.51 x 10 \(^{23}\)
2. B.2.41 x 10 \(^{24}\)
3. C.24.08 x 10 \(^{24}\)
4. D.1.51 x 10 \(^{24}\)
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Answer: B 2.41 x 10 \(^{24}\)
36.
If 5g of Iron filling was reacted with excess dilute H \(_2\) SO \(_4\) to evolve hydrogen gas, which came to completion after 10 min, calculate the rate of reaction in g/hr.
1. A.5
2. B.30
3. C.20
4. D.10
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Answer: C 20
37.
If a gold bar and a silver bar are tied together firmly and left for years, some of the gold particles will be found in the silver bar due to
1. A.Brownian movement
2. B.diffusion
3. C.displacement
4. D.osmosis
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Answer: B diffusion
38.
If there is no change in volume in a gaseous reaction, the pressure will
1. A.favour forward reaction
2. B.favour backward reaction
3. C.have no effect on equilibrium position
4. D.have effect on equilibrium position
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Answer: C have no effect on equilibrium position
39.
In a series of solutions with pH of 2.5, 3.5, 7.0 and 8.0, which is likely to turn red moist litmus paper blue?
1. A.3.5
2. B.8.0
3. C.2.5
4. D.7.0
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Answer: B 8.0
40.
In oxidation reactions, electrons are
1. A.hydrolysed
2. B.removed
3. C.added
4. D.hydrated
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Answer: B removed
41.
In the electrolysis of brine using neutral electrode, which ion is discharged at the anode?
1. A.2H \(^+\)
2. B.Na \(^+\)
3. C.Cl \(^-\)
4. D.OH \(^-\)
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Answer: C Cl \(^-\)
42.
In the equation above, the expression for the equilibrium constant, k \(_c\) is
1. A.\(\frac{[2XY_3]}{[X_2][3Y_2]}\)
2. B.\(\frac{[X_2][3Y_2]}{2XY_3]}\)
3. C.\(\frac{[XY_3]^2}{[X_2][Y_2]}\)
4. D.\(\frac{[X_2][Y_2]^3}{[XY_3]^2}\)
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Answer: B \(\frac{[X_2][3Y_2]}{2XY_3]}\)
43.
In the laboratory preparation of Chlorine, the gas is passed through a wash bottle of water to
1. A.dilute it
2. B.absorb HCl gas
3. C.neutralize it
4. D.absorb the Cl \(_2\) gas
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Answer: B absorb HCl gas
44.
In the laboratory preparation of oxygen using potassium trioxochlorate(V), tetraoxomanganate (VII), usually not recommended in modern laboratory because
1. A.it forms explosive mixture with carbonaceous materials
2. B.it is explosive
3. C.it reacts with the catalyst
4. D.it is hazardous
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Answer: A it forms explosive mixture with carbonaceous materials
45.
In the table above, the two compounds that will combine in the presence of an acid-catalyzed compound, V is
1. A.I and IV
2. B.III and IV
3. C.I and II
4. D.II and III
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Answer: A I and IV
46.
In welding and cutting of metals, the organic gas commonly used in the heating process is
1. A.methane
2. B.propene
3. C.butane
4. D.ethyne
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Answer: D ethyne
47.
Iron produced directly from a blast furnace is
1. A.wrought iron
2. B.cast iron
3. C.pig iron
4. D.carbon steel
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Answer: C pig iron
48.
Magnesium tetraoxosulphate(VI) salt is commonly used as a
1. A.disinfectant
2. B.plasticizer
3. C.fertilizer
4. D.laxative
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Answer: B plasticizer
49.
Mg \(_{(s)}\) + 2HCl \(_{(aq)}\) → MgCl \(_2\) \(_{(aq)}\) + H \(_2\) \(_{(g)}\) In the reaction above, magnesium is a reducing agent because
1. A.oxidized
2. B.reduced
3. C.a metal
4. D.a solid
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Answer: A oxidized
50.
Mg + Pb \(^{2+}\) → Mg \(^{2+}\) + Pb What is the cell notation for the cell reaction above?
1. A.MgIPb \(^{2+}\) IIMg \(^{2+}\) IPb
2. B.MgIMg \(^{2+}\) IIPbIPb \(^{2+}\)
3. C.MgIMg \(^{2+}\) IIPb \(^{2+}\) IPb
4. D.MgIMg \(^+\) IIPbIPb \(^+\)
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Answer: A MgIPb \(^{2+}\) IIMg \(^{2+}\) IPb
51.
Na \(_2\) X ⇌ 2Na \(^+\) + X \(^{2-}\) The bond between Na and X is likely to be
1. A.dative
2. B.ionic
3. C.metallic
4. D.covalent
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Answer: A dative
52.
NH \(_3\) \((_g\) ) + HCl \((_g\) ) → NH \(_4\) Cl \(_(g)\) In the reaction above, increase in pressure will
1. A.lower the equilibrium constant
2. B.favour the product
3. C.favour the reactant
4. D.increase the equilibrium constant
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Answer: B favour the product
53.
Nitrogen, a component of air is used for
1. A.production of cooling agent
2. B.production of margarine
3. C.production of HNO \(_3\)
4. D.manufacturing of oil
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Answer: A production of cooling agent
54.
On heating 12.5g of saturated solution to dryness at 60 \(^0\) C, 2g of anhydrous salt was recovered, calculate its solubility in grams per 100g of water.
1. A.16.0
2. B.4.0
3. C.2.0
4. D.20.0
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Answer: D 20.0
55.
PCl \(_5\) \((_g\) ) → PCl \(_3\) \((_s\) ) + Cl \(_2\) \((_g\) ) In the equation above, the reaction will be spontaneous if
1. A.ΔH = constant
2. B.ΔH = + ve
3. C.ΔH = zero
4. D.ΔH = - ve
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Answer: D ΔH = - ve
56.
Sodium in the above reaction is produced by
1. A.Browning process
2. B.Chlor process
3. C.Downs process
4. D.Bosch process
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Answer: C Downs process
57.
The 5 \(^{th}\) member of an alkyne series is
1. A.C \(_5\) H \(_8\)
2. B.C \(_5\) H \(_{10}\)
3. C.C \(_6\) H \(_{12}\)
4. D.C \(_6\) H \(_{10}\)
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Answer: D C \(_6\) H \(_{10}\)
58.
The above structure is
1. A.alkylamine
2. B.alkanone
3. C.alkanamide
4. D.amino acid
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Answer: C alkanamide
59.
The acid used in making baking soda and soft drink is
1. A.tartaric acid
2. B.fatty acid
3. C.boric acid
4. D.citric acid
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Answer: A tartaric acid
60.
The basicity of C \(_2\) H \(_2\) O \(_4\) is
1. A.3
2. B.4
3. C.2
4. D.8
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Answer: C 2
61.
The catalytic hydrogenation of benzene produces
1. A.hexane
2. B.margarine
3. C.hexene
4. D.cyclohexane
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Answer: D cyclohexane
62.
The composition of petroleum varies because it is a
1. A.hydrocarbon
2. B.liquid
3. C.mixture
4. D.natural resource
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Answer: A hydrocarbon
63.
The compound CH \(_3\) CH(NH \(_2\) )CH \(_2\) CH \(_2\) CH \(_3\) is an example of a
1. A.primary amine
2. B.tertiary amine
3. C.quaternary amine
4. D.secondary amine
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Answer: A primary amine
64.
The compound in which the oxidation state of nitrogen is + 3 is
1. A.N \(_2\) O \(_5\)
2. B.N \(_2\) O \(_3\)
3. C.N \(_2\) O \(_4\)
4. D.N \(_2\) O
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Answer: B N \(_2\) O \(_3\)
65.
The compound responsible for the pleasant scent of fruits and perfumes belongs to the class of
1. A.alkanamide
2. B.alkanone
3. C.alkanal
4. D.alkanoate
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Answer: D alkanoate
66.
The constituents of permalloy are Iron and
1. A.Nickel
2. B.Tin
3. C.Chromium
4. D.Copper
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Answer: A Nickel
67.
The correct arrangement of gases in the order of increasing rate of diffusion is [H = 1, C = 12, N = 14, O = 16, S = 32]
1. A.CO \(_2\) , H \(_2\) , SO \(_2\) , CO
2. B.SO \(_2\) , O \(_2\) , NH \(_3\) , H \(_2\)
3. C.NH \(_3\) , NO \(_2\) ,N \(_2\) , CO \(_2\)
4. D.CO \(_2\) , NH \(_3\) , O \(_2\) , SO \(_2\)
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Answer: B SO \(_2\) , O \(_2\) , NH \(_3\) , H \(_2\)
68.
The disintegration of radioactive phosphorus to silicon follows the first order kinetics with rate constant k \(_1\) = 3.85 x 10 \(^{-3}\) . Determine the half life of phosphorus.
1. A.8 s
2. B.180 s
3. C.80 s
4. D.100 s
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Answer: B 180 s
69.
The dusty and sand particles present in the air is an example of
1. A.a suspension
2. B.a dispersion
3. C.an emulsion
4. D.a saturated solution
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Answer: A a suspension
70.
The empirical mass of C \(_6\) H \(_{12}\) O \(_6\) is [H =1, C = 12, O = 16]
1. A.90
2. B.180
3. C.45
4. D.30
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Answer: D 30
71.
The evaluation of petrol from crude oil before it is put on sale is to prevent
1. A.pinking
2. B.reforming
3. C.pyrolysis
4. D.cracking
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Answer: C pyrolysis
72.
The expression above represents
1. A.Avogadro's law
2. B.Boyle's law
3. C.General gas law
4. D.Charles' law
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Answer: C General gas law
73.
The following is not a water pollutant?
1. A.warm water affluent
2. B.inorganic fertilizers
3. C.oxygen gas
4. D.biodegradable waste
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Answer: C oxygen gas
74.
The fractions of crude oil are best separated by
1. A.steam distillation
2. B.fractional crystallization
3. C.precipitation
4. D.fractional distillation
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Answer: D fractional distillation
75.
The gas produced at the cathode during electrolysis of brine is
1. A.steam
2. B.chlorine
3. C.oxygen
4. D.hydrogen
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Answer: C oxygen
76.
The gas that ammoniacal solution of CuCl \(_2\) is used to absorb from producer or water gas is
1. A.H \(_2\)
2. B.CO
3. C.N \(_2\)
4. D.CO \(_2\)
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Answer: B CO
77.
The gas that is commonly used to demonstrate the fountain experiment is
1. A.hydrogen chloride
2. B.hydrogen sulphide
3. C.dinitrogen(I) oxide
4. D.nitrogen(II) oxide
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Answer: A hydrogen chloride
78.
The IUPAC nomenclature of the compound above is
1. A.propyl ethanoate
2. B.ethyl ethanoate
3. C.ethyl propanoate
4. D.propyl methanoate
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Answer: C ethyl propanoate
79.
The liquid state of water at room temperature is as a result of
1. A.electrovalent bond
2. B.covalent bond
3. C.van der waals forces
4. D.hydrogen bond
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Answer: D hydrogen bond
80.
The major product when 2-methylpropene reacts with HCl is
1. A.2-chloro, 2-methylpropane
2. B.1-chloro,2-methylpropane
3. C.3-chloro, 2-methylpropane
4. D.2-chloro,3-methylbutane
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Answer: A 2-chloro, 2-methylpropane
81.
The metal that will liberate H \(_2\) gas from dilute HNO \(_3\) is
1. A.Cu
2. B.Mg
3. C.Ca
4. D.Zn
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Answer: B Mg
82.
The metal used as a packaging material is
1. A.Al
2. B.Cu
3. C.Fe
4. D.Na
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Answer: A Al
83.
The molecule with the highest number of lone pair of electrons is
1. A.H \(_2\) O
2. B.NH \(_3\)
3. C.CH \(_4\)
4. D.C0 \(_2\)
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Answer: D C0 \(_2\)
84.
The most suitable indicator to be used when reacting ethanedioic acid with potassium hydroxide is
1. A.phenolphthalein
2. B.methyl orange
3. C.methyl red
4. D.methyl purple
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Answer: A phenolphthalein
85.
The nitrogenous compound in dead materials in the soil is converted to
1. A.ammonia
2. B.trioxonitrate(V)
3. C.ammonium salts
4. D.dioxonitrate(III)
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Answer: A ammonia
86.
The process by which iron corrodes is
1. A.rusting
2. B.burning
3. C.galvanizing
4. D.alloying
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Answer: A rusting
87.
The process employed in the industrial preparation of tetraoxosulphate(VI) acid is
1. A.Contact
2. B.Bosch
3. C.Frasch
4. D.Haber
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Answer: A Contact
88.
The process that illustrates reformation of petroleum product is
1. A.hexene to hexane
2. B.cyclohexane to benzene
3. C.hexane to carbon(IV)oxide and water vapour
4. D.hexane to butane and ethane
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Answer: B cyclohexane to benzene
89.
The products of the thermal decomposition of ammonium trioxonitrate(v) are
1. A.N \(_2\) O and H \(_2\) O
2. B.NO \(_2\) and H \(_2\) O
3. C.N \(_2\) O and O \(_2\)
4. D.NO \(_3\) and H \(_2\) O
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Answer: A N \(_2\) O and H \(_2\) O
90.
The property of metal that makes it suitable as a catalyst is
1. A.filled f-orbital
2. B.partially filled d-orbitals
3. C.partially filled f-orbital
4. D.filled d-orbital
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Answer: A filled f-orbital
91.
The reaction above illustrated is
1. A.spontaneous
2. B.endothermic
3. C.exothermic
4. D.reversible
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Answer: B endothermic
92.
The reaction above is
1. A.neutralization
2. B.substitution
3. C.polymerization
4. D.oxidation
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Answer: B substitution
93.
The relative molecular mass of an alkanoic acid with the empirical formula of CH \(_2\) O is [ H = 1, C = 12, O = 16 ]
1. A.46
2. B.88
3. C.60
4. D.72
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Answer: B 88
94.
The source of carbon(II)oxide that acts as air pollutant is
1. A.photochemical smog
2. B.respiration
3. C.combustion of fuel
4. D.decomposition of sewage
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Answer: C combustion of fuel
95.
The stainless steel alloy is used for making
1. A.cutlery
2. B.permanent magnets
3. C.rock crushers
4. D.bridges
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Answer: B permanent magnets
96.
The sublimation of solid to gas involves
1. A.energy absorption
2. B.vapourization
3. C.melting
4. D.osmotic diffusion
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Answer: A energy absorption
97.
The time required to deposit 4.5g of copper from CuSO \(_4\) solution by passing a current of 2.5 Amperes is (Cu = 64g ; 1F = 96500C/mol)
1. A.2714 sec
2. B.2527 sec
3. C.5428 sec
4. D.6785 sec
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Answer: C 5428 sec
98.
The type of bond between copper(II) tetraamine and chlorine in [Cu(NH \(_3\) ) \(_4\) ]Cl \(_2\)
1. A.dative
2. B.van der waals
3. C.ionic
4. D.covalent
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Answer: C ionic
99.
The use of CFCs as a blowing agent has application in
1. A.foam industry
2. B.tyre industry
3. C.refrigerant
4. D.propellant
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Answer: C refrigerant
100.
Water drops are spherical in shape because of
1. A.polarity
2. B.viscocity
3. C.density
4. D.surface tension
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Answer: D surface tension
101.
What accounts for the low melting and boiling points of covalent molecules?
1. A.They have weak intermolecular forces
2. B.They have definite shapes
3. C.They are three dimensional structures
4. D.They possess shared electron pairs
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Answer: A They have weak intermolecular forces
102.
What is the function of concentrated H \(_2\) SO \(_4\) ?
1. A.It reacts with metals to give a salt and hydro gas
2. B.It is a dehydrating agent
3. C.It neutralizes alkali
4. D.It produces a cryolite precipitate with basic solution
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Answer: B It is a dehydrating agent
103.
What is the molecular mass of an alkanoic acid, if 0.5 mole of the acid weighs 44g?
1. A.72
2. B.88
3. C.60
4. D.46
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Answer: B 88
104.
What is the product obtained at the anode in the electrolysis of concentrated sodium chloride using graphite electrode?
1. A.Chlorine gas
2. B.oxygen gas
3. C.water vapour
4. D.hydrogen gas
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Answer: A Chlorine gas
105.
When a sample of air is passed through alkaline pyrogalol, potash and finally through U-tube containing fused calcium chloride, the components of air left unabsorbed are
1. A.nitrogen and carbon(IV)oxide
2. B.noble gases and carbon(IV)oxide
3. C.noble gases and nitrogen
4. D.noble gases, nitrogen and carbon(IV) oxide
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Answer: C noble gases and nitrogen
106.
When ΔH is positive and small, and ΔS is positive and large, the reaction will be
1. A.Non-spontaneous
2. B.favour forward reaction only
3. C.favour backward reaction only
4. D.spontaneous
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Answer: D spontaneous
107.
Which of the following has the highest boiling point?
1. A.CH \(_3\) CH \(_2\) OH
2. B.CH \(_3\) CH \(_2\) CH \(_2\) Cl
3. C.CH \(_3\) CH \(_2\) CH \(_2\) CH \(_2\) CH \(_2\) CH \(_3\)
4. D.CH \(_3\) CH \(_2\) CH \(_2\) OH
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Answer: B CH \(_3\) CH \(_2\) CH \(_2\) Cl
108.
Which of the following pairs of elements will exhibit diagonal relationship?
1. A.Be and Si
2. B.Na and Be
3. C.Li and Al
4. D.B and Si
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Answer: D B and Si
109.
Which of the following statements is false about hard water?
1. A.Helps animals to build strong teeth
2. B.Cannot be supplied in pipes made of leads
3. C.Tastes better than soft water
4. D.Helps animals to build strong bones
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Answer: B Cannot be supplied in pipes made of leads

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