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JAMB - Chemistry (2024)

  • 1
    At a given temperature and pressure, a gas X diffuses twice as fast as gas Y. It follows that
    Відповідь
    (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
    Відповідь
    (C)
    1.73 x 10\(^{24}\)
  • 3
    The constituents of Alnico are Aluminium, Nickel and 
    Відповідь
    (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
    Відповідь
    (D)
    noble metals
  • 5
    In the extraction of Aluminium, the silica impurity is removed by 
    Відповідь
    (B)
    filtration
  • 6
    When Calcium ethynide is decomposed by water, the gas produced is 
    Відповідь
    (C)
    C\(_2\)H\(_2\)
  • 7
    The constituent of petroleum fraction used in surfacing road is
    Відповідь
    (D)
    bitumen
  • 8
    During the fractional distillation of crude oil, the fraction that distills at 200 - 250\(^0\) C is
    Відповідь
    (C)
    kerosene
  • 9
    A liquid hydrocarbon obtained from fractional distillation of coal tar that is used in the pharmaceutical industry is
    Відповідь
    (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]. 
    Відповідь
    (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
    Відповідь
    (C)
    39
  • 12
    Biuret test is a chemical test used for detecting the presence of 
    Відповідь
    (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?
    Відповідь
    (D)
    Oxy-ethylene flame ; cutting and welding metals
  • 14
    The number of geometrical isomers of butene are 
    Відповідь
    (A)
    2
  • 15
    How many isomers has the organic compound represented by the formula C\(_3\)H\(_8\)O ?
    Відповідь
    (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
    Відповідь
    (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
    Відповідь
    (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] 
    Відповідь
    (C)
    2.2
  • 19

    The quantity of electricity required to deposit 180g of Ag from a molten silver trioxonitrate(V) is

    [Ag = 108]

    Відповідь
    (C)
    1.67F
  • 20
    What would be the order of the electrolytic cell in an industry intending the production of silver plated spoons?
    Відповідь
    (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?

    Відповідь
    (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]

    Відповідь
    (A)
    2.7
  • 23
    Strong acids can be distinguished from weak acids by any of the following methods, EXCEPT
    Відповідь
    (B)
    The use of litmus paper
  • 24
    The chemical formula for potassiumhexacyanoferrate(II) is
    Відповідь
    (D)
    K\(_4\)Fe(CN)\(_6\)
  • 25
    For chemical reaction to be spontaneous, ∆G must be
    Відповідь
    (B)
    negative
  • 26
    How many moles of CO\(_2\) are produced when ethanol is burnt with 6g of oxygen
    Відповідь
    (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?
    Відповідь
    (C)
    recrystallization
  • 28

    In the graph above, y represents 

    Відповідь
    (B)
    activation energy
  • 29
    The ions responsible for permanent hardness in water are sulphates of 
    Відповідь
    (B)
    Ca\(^{2+}\) and Mg\(^{2+}\)
  • 30
    One of the following is not a water pollutant?
    Відповідь
    (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

    Відповідь
    (C)
    there is no effect
  • 32
    What method is suitable for the separation of gases present in air?
    Відповідь
    (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
    Відповідь
    (C)
    Pauli Exclusion principle
  • 34
    How much of 5g of radioactive element whose half life is 50days remains after 200days?
    Відповідь
    (D)
    0.31 g
  • 35
    The group VIII elements are the inert gases because they 
    Відповідь
    (B)
    all have completely filled valence shells
  • 36

    Na\(_2\)X ⇌  2Na\(^+\)  +  X\(^{2-}\)

    The bond between Na and X is likely to be

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

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

    Відповідь
    (C)
    isomers
  • 48
    The composition of alloy permalloy is iron and
    Відповідь
    (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\(^{2+}\)
    Відповідь
    (C)
    I, II and III
  • 50

    The IUPAC nomenclature of the compound above is

    Відповідь
    (D)
    2-methyl propan-2-ol
  • 51
    What is formed when metal reacts with acid to liberate gas?
    Відповідь
    (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
    Відповідь
    (B)
    chlorine and hydrogen
  • 53
    A factor that does not affect the rate of a chemical reaction is
    Відповідь
    (C)
    volume
  • 54
    In contact process, the catalyst used in the conversion of sulphur(IV)oxide to sulphur(VI) oxide is 
    Відповідь
    (C)
    vanadium(V)oxide
  • 55
    The element which can combine with oxygen to form an acid anhydride of the form XO\(_2\) is
    Відповідь
    (D)
    sulphur
  • 56
    Rust on the surface of a metal sheet contains
    Відповідь
    (B)
    hydrated iron(III)oxide
  • 57
    A gas that turns lime water milky is likely to be from
    Відповідь
    (A)
    Trioxocarbonate(IV)
  • 58
    When n = 3, the quantum number of an element is
    Відповідь
    (A)
    3
  • 59
    The salt formed when strong acid reacts with strong base is 
    Відповідь
    (A)
    normal
  • 60
    The shape of the molecule of Carbon(IV) oxide is
    Відповідь
    (D)
    linear
  • 61

    \(^{238}_{92}\)U  + \(^1_0\)n → \(^{239}_{92}\)U 

    The process above produces 

    Відповідь
    (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 ]

    Відповідь
    (D)
    1.78 g
  • 63
    Which of the following is an air pollutant?
    Відповідь
    (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 
    Відповідь
    (C)
    33.33
  • 65
    Fog is a colloid in which
    Відповідь
    (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 ]

    Відповідь
    (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 
    Відповідь
    (A)
    J.J Thomson
  • 68
    In the treatment of water for municipal supply, chlorine is used to 
    Відповідь
    (C)
    kill germs
  • 69
    The combustion of candle under limited supply of air forms
    Відповідь
    (C)
    soot and CO
  • 70
    A major effect of oil pollution in coastal water is 
    Відповідь
    (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
    Відповідь
    (C)
    water
  • 72

    \(^{14}_7\)N  + X → \(^{14}_6\)C  + \(^1_1\)P

    In the reaction above, X is 

    Відповідь
    (D)
    a neutron
  • 73
    An example of a substance that does not change directly from solid to gas when heated is
    Відповідь
    (C)
    CaCO\(_3\) \((_s\))
  • 74
    When a specie undergoes oxidation, its
    Відповідь
    (A)
    oxidation number increases
  • 75
    Hydrochloric acid is regarded as a strong acid because it
    Відповідь
    (B)
    ionizes completely
  • 76
    The IUPAC nomenclature of the complex K\(_4\)Fe(CN)\(_6\) is
    Відповідь
    (A)
    potassium hexacyanoferrate(II)
  • 77
    An example of an amphoteric oxide is
    Відповідь
    (B)
    Al\(_2\)O\(_3\)
  • 78
    The term that is not associated with petroleum industry is ?
    Відповідь
    (D)
    Fermentation
  • 79
    Kerosene is used as solvent for 
    Відповідь
    (A)
    Paints
  • 80
    A typical chemical reaction will be spontaneous if 
    Відповідь
    (A)
    enthalpy change is negative
  • 81
    The indicator used in a titration between strong acid and weak base is
    Відповідь
    (A)
    methyl orange
  • 82
    Nitrogen obtained from air is not absolutely pure because it contains the following except
    Відповідь
    (A)
    oxygen
  • 83
    Solubility curve is a plot of solubility against 
    Відповідь
    (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\(^3\)).
    Відповідь
    (A)
    22
  • 85
    The Van der waals forces of attraction operates between
    Відповідь
    (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
    Відповідь
    (D)
    simply obeying rules governing electron configuration
  • 87
    The reaction of hydrogen and chlorine to produce hydrogen chloride gas is explosive in 
    Відповідь
    (B)
    sunlight
  • 88
    The term strong and weak acids is used to indicate the 
    Відповідь
    (C)
    extent of ionization of an acid
  • 89
    The main constituent of water-glass is
    Відповідь
    (D)
    sodium trioxosilicate(IV)
  • 90
    Which of the following represents an order of increasing reactivity?
    Відповідь
    (A)
    Au < Cu < Sn < Fe < Ca
  • 91
    An oxide of nitrogen that can rekindle a glowing splint is 
    Відповідь
    (A)
    nitrogen(I)oxide
  • 92
    In a chemical reaction, surface area of reactants can affect
    Відповідь
    (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?

    Відповідь
    (A)
    20cm\(^3\)
  • 94
    The hybridization scheme in ethyne is
    Відповідь
    (A)
    sp
  • 95
    An organic compound with general formula RCOR' is an
    Відповідь
    (A)
    alkanone
  • 96
    The amount of Faraday required to discharge 4.5 moles of Al\(^{3+}\) is
    Відповідь
    (A)
    13.5
  • 97
    The reaction between alkanoic acids and alkanols in the presence of an acid catalyst is known as
    Відповідь
    (C)
    esterification
  • 98

    C\(_x\)H\(_y\)O + 5O\(_2\) →  4CO\(_2\)  +  4H\(_2\)O

    C\(_x\)H\(_y\)O in the equation is

    Відповідь
    (D)
    C\(_2\)H\(_4\)O
  • 99
    Alkylation of benzene is catalyzed by 
    Відповідь
    (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 
    Відповідь
    (C)
    tetraoxosulphate(VI) acid
  • 101
    The general molecular formula C\(_n\)H\(_{2n-2}\) represents that of an
    Відповідь
    (A)
    alkyne
  • 102
    What accounts for the low melting and boiling points of covalent molecules?
    Відповідь
    (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
    Відповідь
    (C)
    alkanol
  • 104
    Hydrochloric acid is not suitable in the preparation of ethanoic acid because it
    Відповідь
    (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?
    Відповідь
    (D)
    1/32
  • 106
    Hydrogen chloride gas and ammonia can be used to demonstrate the fountain experiment because they are
    Відповідь
    (C)
    very soluble in water
  • 107
    In the conductance of aqueous CuSO\(_4\) solution, the current carriers are the
    Відповідь
    (C)
    hydrated ions
  • 108
    A type of isomerism that ClCH=CHCl can exhibit is 
    Відповідь
    (B)
    positional
  • 109
    The basicity of tetraoxophosphate(V) acid is
    Відповідь
    (D)
    3
  • 110
    Which of the following is used in forming slag in the blast furnace for the extraction of iron?
    Відповідь
    (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 ]

    Відповідь
    (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\(^{-1}\) ]

    Відповідь
    (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 
    Відповідь
    (C)
    efflorescence
  • 114
    The compound of Copper used as a fungicide is
    Відповідь
    (C)
    CuSO\(_4\)
  • 115
    The percentage of hydrogen in the sixth member of the class of the aliphatic alkanes is  [H =1, C =12 ]
    Відповідь
    (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
    Відповідь
    (B)
    law of definite proportion
  • 117
    The stability of atomic nucleus is determined by ratio of 
    Відповідь
    (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]
    Відповідь
    (D)
    4.2 moldm\(^3\)
  • 119
    An example of a physical change is 
    Відповідь
    (B)
    liquefaction of liquids
  • 120
    The product formed when ethyne is passed through a hot tube containing finely divided iron is
    Відповідь
    (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?

    Відповідь
    (C)
    -2 to 0
  • 122
    If a stable neutral atom has a mass number of 31, the number of electrons and neutrons respectively are
    Відповідь
    (A)
    15 and 16
  • 123
    Scandium is not regarded as a transition metal because its ion has 
    Відповідь
    (A)
    no electron in the d-orbital
  • 124
    An example of highly unsaturated hydrocarbon is
    Відповідь
    (A)
    C\(_2\)H\(_2\)
  • 125
    Biodegradable pollutants are not safe in water systems because they can cause
    Відповідь
    (C)
    ill health
  • 126
    An example of a compound that is acidic in solution is
    Відповідь
    (B)
    NH\(_4\)Cl
  • 127
    The amount of water a substance chemically combined with is called water of
    Відповідь
    (D)
    crystallization
  • 128
    Heat of solution involves two steps that is accompanied by heat change. The energies involved in this steps are
    Відповідь
    (A)
    lattice energy and hydration energy
  • 129

    The IUPAC name of the compound above is

    Відповідь
    (C)
    2-bromo, 2-methyl butane
  • 130
    The shape of ammonia molecule is
    Відповідь
    (D)
    trigonal
  • 131
    The percentage of carbon(IV) oxide in air is
    Відповідь
    (D)
    0.03
  • 132
    An example of a physical change is 
    Відповідь
    (B)
    boiling of water
  • 133
    Boyle's law can be expressed mathematically as
    Відповідь
    (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\(^3\) ]

    Відповідь
    (B)
    8.0
  • 135
    When the subsidiary quantum numbers (l) equals 1, the shape of the orbital is 
    Відповідь
    (B)
    dumb-bell