JAMB - Chemistry (2024)

• 1

  At a given temperature and pressure, a gas X diffuses twice as fast as gas Y. It follows that

  პასუხი

  (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

  პასუხი

  (C)

  1.73 x 10\(^{24}\)
• 3

  The constituents of Alnico are Aluminium, Nickel and 

  პასუხი

  (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

  პასუხი

  (D)

  noble metals
• 5

  In the extraction of Aluminium, the silica impurity is removed by 

  პასუხი

  (B)

  filtration
• 6

  When Calcium ethynide is decomposed by water, the gas produced is 

  პასუხი

  (C)

  C\(_2\)H\(_2\)
• 7

  The constituent of petroleum fraction used in surfacing road is

  პასუხი

  (D)

  bitumen
• 8

  During the fractional distillation of crude oil, the fraction that distills at 200 - 250\(^0\) C is

  პასუხი

  (C)

  kerosene
• 9

  A liquid hydrocarbon obtained from fractional distillation of coal tar that is used in the pharmaceutical industry is

  პასუხი

  (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]. 

  პასუხი

  (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

  პასუხი

  (C)

  39
• 12

  Biuret test is a chemical test used for detecting the presence of 

  პასუხი

  (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?

  პასუხი

  (D)

  Oxy-ethylene flame ; cutting and welding metals
• 14

  The number of geometrical isomers of butene are 

  პასუხი

  (A)

  2
• 15

  How many isomers has the organic compound represented by the formula C\(_3\)H\(_8\)O ?

  პასუხი

  (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

  პასუხი

  (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

  პასუხი

  (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] 

  პასუხი

  (C)

  2.2
• 19

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

  [Ag = 108]

  პასუხი

  (C)

  1.67F
• 20

  What would be the order of the electrolytic cell in an industry intending the production of silver plated spoons?

  პასუხი

  (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?

  პასუხი

  (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]

  პასუხი

  (A)

  2.7
• 23

  Strong acids can be distinguished from weak acids by any of the following methods, EXCEPT

  პასუხი

  (B)

  The use of litmus paper
• 24

  The chemical formula for potassiumhexacyanoferrate(II) is

  პასუხი

  (D)

  K\(_4\)Fe(CN)\(_6\)
• 25

  For chemical reaction to be spontaneous, ∆G must be

  პასუხი

  (B)

  negative
• 26

  How many moles of CO\(_2\) are produced when ethanol is burnt with 6g of oxygen

  პასუხი

  (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?

  პასუხი

  (C)

  recrystallization
• 28

  

  In the graph above, y represents 

  პასუხი

  (B)

  activation energy
• 29

  The ions responsible for permanent hardness in water are sulphates of 

  პასუხი

  (B)

  Ca\(^{2+}\) and Mg\(^{2+}\)
• 30

  One of the following is not a water pollutant?

  პასუხი

  (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

  პასუხი

  (C)

  there is no effect
• 32

  What method is suitable for the separation of gases present in air?

  პასუხი

  (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

  პასუხი

  (C)

  Pauli Exclusion principle
• 34

  How much of 5g of radioactive element whose half life is 50days remains after 200days?

  პასუხი

  (D)

  0.31 g
• 35

  The group VIII elements are the inert gases because they 

  პასუხი

  (B)

  all have completely filled valence shells
• 36

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

  The bond between Na and X is likely to be

  პასუხი

  (C)

  ionic
• 37

  The highest isotope of hydrogen is

  პასუხი

  (C)

  tritium
• 38

  When Sulphur(IV)oxide is passed into solution of acidified tetraoxomanganate(VII), the colour changes from 

  პასუხი

  (C)

  purple to colourless
• 39

  Water gas obtained from the gasification of coke is made up of 

  პასუხი

  (C)

  Hydrogen and Carbon(II) oxide
• 40

  Sulphur(IV)oxide can be used as a

  პასუხი

  (C)

  refrigerant
• 41

  The molecular formular of a hydrocarbon with an empirical formula of CH\(_3\)  and a molar mass of 30 is 

  პასუხი

  (C)

  C\(_2\)H\(_6\)
• 42

  The difference in molecular mass between an alkene and alkyne with six carbon per mole is

  პასუხი

  (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?

  პასუხი

  (C)

  S and V
• 44

  Fats and oils are esters of fatty organic acids combined with a trihydric alkanol commonly referred to as 

  პასუხი

  (D)

  glycerol
• 45

  Determine the half-life of a first order reaction with constant 4.5 x 10\(^{-3}\) sec\(^{-1}\).

  პასუხი

  (A)

  154 s
• 46

  Alkanoates are naturally found in

  პასუხი

  (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 

  პასუხი

  (C)

  isomers
• 48

  The composition of alloy permalloy is iron and

  პასუხი

  (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\(^{2+}\)

  პასუხი

  (C)

  I, II and III
• 50

  

  The IUPAC nomenclature of the compound above is

  პასუხი

  (D)

  2-methyl propan-2-ol
• 51

  What is formed when metal reacts with acid to liberate gas?

  პასუხი

  (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

  პასუხი

  (B)

  chlorine and hydrogen
• 53

  A factor that does not affect the rate of a chemical reaction is

  პასუხი

  (C)

  volume
• 54

  In contact process, the catalyst used in the conversion of sulphur(IV)oxide to sulphur(VI) oxide is 

  პასუხი

  (C)

  vanadium(V)oxide
• 55

  The element which can combine with oxygen to form an acid anhydride of the form XO\(_2\) is

  პასუხი

  (D)

  sulphur
• 56

  Rust on the surface of a metal sheet contains

  პასუხი

  (B)

  hydrated iron(III)oxide
• 57

  A gas that turns lime water milky is likely to be from

  პასუხი

  (A)

  Trioxocarbonate(IV)
• 58

  When n = 3, the quantum number of an element is

  პასუხი

  (A)

  3
• 59

  The salt formed when strong acid reacts with strong base is 

  პასუხი

  (A)

  normal
• 60

  The shape of the molecule of Carbon(IV) oxide is

  პასუხი

  (D)

  linear
• 61

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

  The process above produces 

  პასუხი

  (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 ]

  პასუხი

  (D)

  1.78 g
• 63

  Which of the following is an air pollutant?

  პასუხი

  (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 

  პასუხი

  (C)

  33.33
• 65

  Fog is a colloid in which

  პასუხი

  (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 ]

  პასუხი

  (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 

  პასუხი

  (A)

  J.J Thomson
• 68

  In the treatment of water for municipal supply, chlorine is used to 

  პასუხი

  (C)

  kill germs
• 69

  The combustion of candle under limited supply of air forms

  პასუხი

  (C)

  soot and CO
• 70

  A major effect of oil pollution in coastal water is 

  პასუხი

  (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

  პასუხი

  (C)

  water
• 72

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

  In the reaction above, X is 

  პასუხი

  (D)

  a neutron
• 73

  An example of a substance that does not change directly from solid to gas when heated is

  პასუხი

  (C)

  CaCO\(_3\) \((_s\))
• 74

  When a specie undergoes oxidation, its

  პასუხი

  (A)

  oxidation number increases
• 75

  Hydrochloric acid is regarded as a strong acid because it

  პასუხი

  (B)

  ionizes completely
• 76

  The IUPAC nomenclature of the complex K\(_4\)Fe(CN)\(_6\) is

  პასუხი

  (A)

  potassium hexacyanoferrate(II)
• 77

  An example of an amphoteric oxide is

  პასუხი

  (B)

  Al\(_2\)O\(_3\)
• 78

  The term that is not associated with petroleum industry is ?

  პასუხი

  (D)

  Fermentation
• 79

  Kerosene is used as solvent for 

  პასუხი

  (A)

  Paints
• 80

  A typical chemical reaction will be spontaneous if 

  პასუხი

  (A)

  enthalpy change is negative
• 81

  The indicator used in a titration between strong acid and weak base is

  პასუხი

  (A)

  methyl orange
• 82

  Nitrogen obtained from air is not absolutely pure because it contains the following except

  პასუხი

  (A)

  oxygen
• 83

  Solubility curve is a plot of solubility against 

  პასუხი

  (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\(^3\)).

  პასუხი

  (A)

  22
• 85

  The Van der waals forces of attraction operates between

  პასუხი

  (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

  პასუხი

  (D)

  simply obeying rules governing electron configuration
• 87

  The reaction of hydrogen and chlorine to produce hydrogen chloride gas is explosive in 

  პასუხი

  (B)

  sunlight
• 88

  The term strong and weak acids is used to indicate the 

  პასუხი

  (C)

  extent of ionization of an acid
• 89

  The main constituent of water-glass is

  პასუხი

  (D)

  sodium trioxosilicate(IV)
• 90

  Which of the following represents an order of increasing reactivity?

  პასუხი

  (A)

  Au < Cu < Sn < Fe < Ca
• 91

  An oxide of nitrogen that can rekindle a glowing splint is 

  პასუხი

  (A)

  nitrogen(I)oxide
• 92

  In a chemical reaction, surface area of reactants can affect

  პასუხი

  (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?

  პასუხი

  (A)

  20cm\(^3\)
• 94

  The hybridization scheme in ethyne is

  პასუხი

  (A)

  sp
• 95

  An organic compound with general formula RCOR' is an

  პასუხი

  (A)

  alkanone
• 96

  The amount of Faraday required to discharge 4.5 moles of Al\(^{3+}\) is

  პასუხი

  (A)

  13.5
• 97

  The reaction between alkanoic acids and alkanols in the presence of an acid catalyst is known as

  პასუხი

  (C)

  esterification
• 98

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

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

  პასუხი

  (D)

  C\(_2\)H\(_4\)O
• 99

  Alkylation of benzene is catalyzed by 

  პასუხი

  (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 

  პასუხი

  (C)

  tetraoxosulphate(VI) acid
• 101

  The general molecular formula C\(_n\)H\(_{2n-2}\) represents that of an

  პასუხი

  (A)

  alkyne
• 102

  What accounts for the low melting and boiling points of covalent molecules?

  პასუხი

  (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

  პასუხი

  (C)

  alkanol
• 104

  Hydrochloric acid is not suitable in the preparation of ethanoic acid because it

  პასუხი

  (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?

  პასუხი

  (D)

  1/32
• 106

  Hydrogen chloride gas and ammonia can be used to demonstrate the fountain experiment because they are

  პასუხი

  (C)

  very soluble in water
• 107

  In the conductance of aqueous CuSO\(_4\) solution, the current carriers are the

  პასუხი

  (C)

  hydrated ions
• 108

  A type of isomerism that ClCH=CHCl can exhibit is 

  პასუხი

  (B)

  positional
• 109

  The basicity of tetraoxophosphate(V) acid is

  პასუხი

  (D)

  3
• 110

  Which of the following is used in forming slag in the blast furnace for the extraction of iron?

  პასუხი

  (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 ]

  პასუხი

  (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\(^{-1}\) ]

  პასუხი

  (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 

  პასუხი

  (C)

  efflorescence
• 114

  The compound of Copper used as a fungicide is

  პასუხი

  (C)

  CuSO\(_4\)
• 115

  The percentage of hydrogen in the sixth member of the class of the aliphatic alkanes is  [H =1, C =12 ]

  პასუხი

  (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

  პასუხი

  (B)

  law of definite proportion
• 117

  The stability of atomic nucleus is determined by ratio of 

  პასუხი

  (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]

  პასუხი

  (D)

  4.2 moldm\(^3\)
• 119

  An example of a physical change is 

  პასუხი

  (B)

  liquefaction of liquids
• 120

  The product formed when ethyne is passed through a hot tube containing finely divided iron is

  პასუხი

  (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?

  პასუხი

  (C)

  -2 to 0
• 122

  If a stable neutral atom has a mass number of 31, the number of electrons and neutrons respectively are

  პასუხი

  (A)

  15 and 16
• 123

  Scandium is not regarded as a transition metal because its ion has 

  პასუხი

  (A)

  no electron in the d-orbital
• 124

  An example of highly unsaturated hydrocarbon is

  პასუხი

  (A)

  C\(_2\)H\(_2\)
• 125

  Biodegradable pollutants are not safe in water systems because they can cause

  პასუხი

  (C)

  ill health
• 126

  An example of a compound that is acidic in solution is

  პასუხი

  (B)

  NH\(_4\)Cl
• 127

  The amount of water a substance chemically combined with is called water of

  პასუხი

  (D)

  crystallization
• 128

  Heat of solution involves two steps that is accompanied by heat change. The energies involved in this steps are

  პასუხი

  (A)

  lattice energy and hydration energy
• 129

  

  The IUPAC name of the compound above is

  პასუხი

  (C)

  2-bromo, 2-methyl butane
• 130

  The shape of ammonia molecule is

  პასუხი

  (D)

  trigonal
• 131

  The percentage of carbon(IV) oxide in air is

  პასუხი

  (D)

  0.03
• 132

  An example of a physical change is 

  პასუხი

  (B)

  boiling of water
• 133

  Boyle's law can be expressed mathematically as

  პასუხი

  (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\(^3\) ]

  პასუხი

  (B)

  8.0
• 135

  When the subsidiary quantum numbers (l) equals 1, the shape of the orbital is 

  პასუხი

  (B)

  dumb-bell