JAMB - Chemistry (2024)

1
At a given temperature and pressure, a gas X diffuses twice as fast as gas Y. It follows that
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(B)
Gas Y is four times as heavy as Gas X
2
The number of molecules of helium gas contained in 11.5g of the gas is
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(C)
1.73 x 10\(^{24}\)
3
The constituents of Alnico are Aluminium, Nickel and
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(B)
Co
4
Silver and Gold are metals found as free uncombined elements in the earth's crust, which makes them to be referred to as
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(D)
noble metals
5
In the extraction of Aluminium, the silica impurity is removed by
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(B)
filtration
6
When Calcium ethynide is decomposed by water, the gas produced is
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(C)
C\(_2\)H\(_2\)
7
The constituent of petroleum fraction used in surfacing road is
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(D)
bitumen
8
During the fractional distillation of crude oil, the fraction that distills at 200 - 250\(^0\) C is
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(C)
kerosene
9
A liquid hydrocarbon obtained from fractional distillation of coal tar that is used in the pharmaceutical industry is
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(B)
benzene
10
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].
Răspuns
(A)
C\(_5\)H\(_7\)NO\(_2\)
11
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
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(C)
39
12
Biuret test is a chemical test used for detecting the presence of
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(B)
proteins
13
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?
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(D)
Oxy-ethylene flame ; cutting and welding metals
14
The number of geometrical isomers of butene are
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(A)
2
15
How many isomers has the organic compound represented by the formula C\(_3\)H\(_8\)O ?
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(B)
3
16
When a few drops of Millon reagents is added to egg-white solution in a test tube, the white precipitate changes to
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(B)
brick red
17
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
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(B)
unsaturated
18
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]
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(C)
2.2
19
The quantity of electricity required to deposit 180g of Ag from a molten silver trioxonitrate(V) is

[Ag = 108]
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(C)
1.67F
20
What would be the order of the electrolytic cell in an industry intending the production of silver plated spoons?
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(A)
Cathode is the spoon; anode is a silver rod; electrolyte is a soluble silver salt
21
The table above shows the formulae of some ions. In which of these compounds is the formula not correct?
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(C)
Iron(III)bromide, Fe\(_3\)Br
22
The pH of a 0.001 mol dm\(^{-3}\) of H\(_2\)SO\(_4\) is

[Log\(_{10}\)2 = 0.3]
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(A)
2.7
23
Strong acids can be distinguished from weak acids by any of the following methods, EXCEPT
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(B)
The use of litmus paper
24
The chemical formula for potassiumhexacyanoferrate(II) is
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(D)
K\(_4\)Fe(CN)\(_6\)
25
For chemical reaction to be spontaneous, ∆G must be
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(B)
negative
26
How many moles of CO\(_2\) are produced when ethanol is burnt with 6g of oxygen
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(A)
0.125
27
Which of these is the most preferred separation technique for the isolation of solutes where the purity of the constituent is of utmost importance?
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(C)
recrystallization
28
In the graph above, y represents
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(B)
activation energy
29
The ions responsible for permanent hardness in water are sulphates of
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(B)
Ca\(^{2+}\) and Mg\(^{2+}\)
30
One of the following is not a water pollutant?
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(C)
Oxygen gas
31
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
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(C)
there is no effect
32
What method is suitable for the separation of gases present in air?
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(B)
Fractional distillation of liquid air
33
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
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(C)
Pauli Exclusion principle
34
How much of 5g of radioactive element whose half life is 50days remains after 200days?
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(D)
0.31 g
35
The group VIII elements are the inert gases because they
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(B)
all have completely filled valence shells
36
Na\(_2\)X ⇌ 2Na\(^+\) + X\(^{2-}\)

The bond between Na and X is likely to be
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(C)
ionic
37
The highest isotope of hydrogen is
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(C)
tritium
38
When Sulphur(IV)oxide is passed into solution of acidified tetraoxomanganate(VII), the colour changes from
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(C)
purple to colourless
39
Water gas obtained from the gasification of coke is made up of
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(C)
Hydrogen and Carbon(II) oxide
40
Sulphur(IV)oxide can be used as a
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(C)
refrigerant
41
The molecular formular of a hydrocarbon with an empirical formula of CH\(_3\) and a molar mass of 30 is
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(C)
C\(_2\)H\(_6\)
42
The difference in molecular mass between an alkene and alkyne with six carbon per mole is
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(C)
2
43

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?
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(C)
S and V
44
Fats and oils are esters of fatty organic acids combined with a trihydric alkanol commonly referred to as
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(D)
glycerol
45
Determine the half-life of a first order reaction with constant 4.5 x 10\(^{-3}\) sec\(^{-1}\).
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(A)
154 s
46
Alkanoates are naturally found in
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(A)
lipids
47
CH\(_3\)-CH\(_2\)-OH and CH\(_3\)-O-CH\(_3\)

The relationship between the two compounds above, is that they are
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(C)
isomers
48
The composition of alloy permalloy is iron and
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(B)
nickel
49
Aqueous solution of sodium hydroxide can be used to test for the presence of : I. Ca\(^{2+}\) , II. Zn\(^{2+}\) , III. Cu\(^{2+}\)
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(C)
I, II and III
50
The IUPAC nomenclature of the compound above is
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(D)
2-methyl propan-2-ol
51
What is formed when metal reacts with acid to liberate gas?
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(A)
Salt
52
Concentrated sodium chloride solution is electrolyzed using mercury cathode and graphite anode. The products at the anode and the cathode respectively are
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(B)
chlorine and hydrogen
53
A factor that does not affect the rate of a chemical reaction is
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(C)
volume
54
In contact process, the catalyst used in the conversion of sulphur(IV)oxide to sulphur(VI) oxide is
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(C)
vanadium(V)oxide
55
The element which can combine with oxygen to form an acid anhydride of the form XO\(_2\) is
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(D)
sulphur
56
Rust on the surface of a metal sheet contains
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(B)
hydrated iron(III)oxide
57
A gas that turns lime water milky is likely to be from
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(A)
Trioxocarbonate(IV)
58
When n = 3, the quantum number of an element is
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(A)
3
59
The salt formed when strong acid reacts with strong base is
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(A)
normal
60
The shape of the molecule of Carbon(IV) oxide is
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(D)
linear
61
\(^{238}_{92}\)U + \(^1_0\)n → \(^{239}_{92}\)U

The process above produces
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(B)
a radioactive isotope
62
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 ]
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(D)
1.78 g
63
Which of the following is an air pollutant?
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(B)
CO
64
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
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(C)
33.33
65
Fog is a colloid in which
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(A)
liquid particles is dispersed in a gas medium
66
Determine the empirical formula of an oxide of sulphur containing 60% of oxygen

[S = 32, O = 16 ]
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(A)
SO\(_3\)
67
The scientist that performed the experiment on discharged tubes that led to the discovery of the cathode rays as a sub-atomic particle is
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(A)
J.J Thomson
68
In the treatment of water for municipal supply, chlorine is used to
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(C)
kill germs
69
The combustion of candle under limited supply of air forms
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(C)
soot and CO
70
A major effect of oil pollution in coastal water is
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(A)
destruction of aquatic life
71
The substance that reacts with sodium to form alkali and changes white anhydrous copper(II) tetraoxosulphate (VI) to blue is
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(C)
water
72
\(^{14}_7\)N + X → \(^{14}_6\)C + \(^1_1\)P

In the reaction above, X is
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(D)
a neutron
73
An example of a substance that does not change directly from solid to gas when heated is
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(C)
CaCO\(_3\) \((_s\))
74
When a specie undergoes oxidation, its
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(A)
oxidation number increases
75
Hydrochloric acid is regarded as a strong acid because it
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(B)
ionizes completely
76
The IUPAC nomenclature of the complex K\(_4\)Fe(CN)\(_6\) is
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(A)
potassium hexacyanoferrate(II)
77
An example of an amphoteric oxide is
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(B)
Al\(_2\)O\(_3\)
78
The term that is not associated with petroleum industry is ?
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(D)
Fermentation
79
Kerosene is used as solvent for
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(A)
Paints
80
A typical chemical reaction will be spontaneous if
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(A)
enthalpy change is negative
81
The indicator used in a titration between strong acid and weak base is
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(A)
methyl orange
82
Nitrogen obtained from air is not absolutely pure because it contains the following except
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(A)
oxygen
83
Solubility curve is a plot of solubility against
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(A)
temperature
84
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\(^3\)).
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(A)
22
85
The Van der waals forces of attraction operates between
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(C)
molecules
86
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
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(D)
simply obeying rules governing electron configuration
87
The reaction of hydrogen and chlorine to produce hydrogen chloride gas is explosive in
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(B)
sunlight
88
The term strong and weak acids is used to indicate the
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(C)
extent of ionization of an acid
89
The main constituent of water-glass is
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(D)
sodium trioxosilicate(IV)
90
Which of the following represents an order of increasing reactivity?
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(A)
Au < Cu < Sn < Fe < Ca
91
An oxide of nitrogen that can rekindle a glowing splint is
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(A)
nitrogen(I)oxide
92
In a chemical reaction, surface area of reactants can affect
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(A)
CaCO\(_3\) + 2HCl → CaCl\(_2\) + H\(_2\)O + CO\(_2\)
93
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?
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(A)
20cm\(^3\)
94
The hybridization scheme in ethyne is
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(A)
sp
95
An organic compound with general formula RCOR' is an
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(A)
alkanone
96
The amount of Faraday required to discharge 4.5 moles of Al\(^{3+}\) is
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(A)
13.5
97
The reaction between alkanoic acids and alkanols in the presence of an acid catalyst is known as
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(C)
esterification
98
C\(_x\)H\(_y\)O + 5O\(_2\) → 4CO\(_2\) + 4H\(_2\)O

C\(_x\)H\(_y\)O in the equation is
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(D)
C\(_2\)H\(_4\)O
99
Alkylation of benzene is catalyzed by
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(D)
aluminium chloride
100
Benzene formed nitrobenzene at temperature of 60\(^0\)C when it reacts with mixture of concentrated trioxonitrate(V) acid and concentrated
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(C)
tetraoxosulphate(VI) acid
101
The general molecular formula C\(_n\)H\(_{2n-2}\) represents that of an
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(A)
alkyne
102
What accounts for the low melting and boiling points of covalent molecules?
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(A)
They have weak intermolecular forces.
103
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
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(C)
alkanol
104
Hydrochloric acid is not suitable in the preparation of ethanoic acid because it
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(B)
is too volatile
105
A radioactive element of mass 1g has half-life of 2 minutes, what fraction of the substance would have disintegrated after 10 minutes?
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(D)
1/32
106
Hydrogen chloride gas and ammonia can be used to demonstrate the fountain experiment because they are
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(C)
very soluble in water
107
In the conductance of aqueous CuSO\(_4\) solution, the current carriers are the
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(C)
hydrated ions
108
A type of isomerism that ClCH=CHCl can exhibit is
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(B)
positional
109
The basicity of tetraoxophosphate(V) acid is
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(D)
3
110
Which of the following is used in forming slag in the blast furnace for the extraction of iron?
Răspuns
(C)
CaCO\(_3\)
111
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 ]
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(B)
1.0 mole
112
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\(^{-1}\) ]
Răspuns
(A)
14.84 dm\(^3\)
113
If a salt weighs 2g and upon exposure to the atmosphere weighs 1.5g, this is as a result of
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(C)
efflorescence
114
The compound of Copper used as a fungicide is
Răspuns
(C)
CuSO\(_4\)
115
The percentage of hydrogen in the sixth member of the class of the aliphatic alkanes is [H =1, C =12 ]
Răspuns
(C)
16.28
116
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
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(B)
law of definite proportion
117
The stability of atomic nucleus is determined by ratio of
Răspuns
(B)
Neutron/proton
118
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]
Răspuns
(D)
4.2 moldm\(^3\)
119
An example of a physical change is
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(B)
liquefaction of liquids
120
The product formed when ethyne is passed through a hot tube containing finely divided iron is
Răspuns
(D)
aromatic
121
H\(_2\)S\(_{(g)}\) + Cl\(_2\)\(_{(g)}\) → 2HCl\(_{(g)}\) + S\(_{(s)}\)

What is the change in oxidation state of sulphur from reactant to product?
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(C)
-2 to 0
122
If a stable neutral atom has a mass number of 31, the number of electrons and neutrons respectively are
Răspuns
(A)
15 and 16
123
Scandium is not regarded as a transition metal because its ion has
Răspuns
(A)
no electron in the d-orbital
124
An example of highly unsaturated hydrocarbon is
Răspuns
(A)
C\(_2\)H\(_2\)
125
Biodegradable pollutants are not safe in water systems because they can cause
Răspuns
(C)
ill health
126
An example of a compound that is acidic in solution is
Răspuns
(B)
NH\(_4\)Cl
127
The amount of water a substance chemically combined with is called water of
Răspuns
(D)
crystallization
128
Heat of solution involves two steps that is accompanied by heat change. The energies involved in this steps are
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(A)
lattice energy and hydration energy
129
The IUPAC name of the compound above is
Răspuns
(C)
2-bromo, 2-methyl butane
130
The shape of ammonia molecule is
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(D)
trigonal
131
The percentage of carbon(IV) oxide in air is
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(D)
0.03
132
An example of a physical change is
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(B)
boiling of water
133
Boyle's law can be expressed mathematically as
Răspuns
(A)
PV = K
134
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\(^3\) ]
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(B)
8.0
135
When the subsidiary quantum numbers (l) equals 1, the shape of the orbital is
Răspuns
(B)
dumb-bell

COMPOUND	S	T	U	V	W
FORMULA	ROR'	RCOOH'	RCOR'	ROH'	RCOOR'