40+ JAMB 2019 Chemistry Questions You may See in Your Exams + OBJ Answers

 

 

Below are some JAMB repeated questions you may see in your JAMB chemistry CBT examination. Note that this question are for revision purposes only.

JAMB CHEMISTRY Past Question and Answers

QUESTION 1
Air boiled out of water as steam is richer in
(A) nitrogen and oxygen
(B) carbon(iv)oxide and oxygen
(C) noble gases and carbon(iv)oxide
(D) oxygen and noble gases

QUESTION 2
Which of the following is an example of a mixture?
(A) common salt
(B) blood
(C) sand
(D) washing soda

QUESTION 3
Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V) [Ca=40, N=14, O=16]
(A) 8.5%
(B)  13.1%
(C)  17.1%
(D)  27.6%

 

 

QUESTION 4
The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the
(A)  water vapour in the air around the bottle gains some energy from the bottle
(B)  temperature of the milk drops as it loses heat into the surroundings
(C)  saturated vapour pressure of the milk is equal to the atmospheric pressure
(D)  water vapour in the air around the bottle loses some of its energy to the bottle

QUESTION 5
The volume of a given gas is V cm3 at P mm Hg. What is the new volume of the gas if the pressure is reduced to half at constant temperature?
(A)  4V cm2
(B)  2V cm3
(C)  v/2 cm2
(D)  V cm3

QUESTION 6
Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the
(A) decrease in nuclear charge
(B)  increase in nuclear charge
(C)  decrease in screening effect
(D)  increase in screening effect

 

QUESTION 7
How many unpaired electron(s) are there in the
(A)  3
(B)  2
(C)  1
(D)  0

QUESTION 8
The stability of the noble gases is due to the fact that they
(A)  have no electron in their outermost shells
(B)  have duplet or octet electron configurations
(C)  belong to group zero of the periodic table
(D)  are volatile in nature

QUESTION 9
The maximum number of electrons in the L shell of an atom is
(A)  2
(B)  8
(C)  18
(D) 32

QUESTION 10
Elements in the same period in the periodic table have the same
(A)  number of shells
(B)  atomic number
(C)  chemical properties
(D)  physical properties

QUESTION 11
In the course of purifying water for town supply ,the water is passed through large settling tanks containing sodium aluminate (iii) to remove
(A) large particles
(B)  germs
(C)  fine particles
(D) odour

QUESTION 12
A noble gas with a high power of fog penetration used in aerodrome beacons is
(A)  krypton
(B)  argon
(C)  helium
(D)  neon

QUESTION 13
Permanent hardness of water can be removed by
(A)  filtration
(B)  adding slaked lime
(C)  adding caustin soda
(D)  boiling

QUESTION 14
Substances employed as drying agents are usually
(A)  ampohoteric
(B)  hygroscopic
(C)  efflorescent
(D)  acidic

QUESTION 15
Calculate the solubility in mol dm-3 of 40g of cuSo4 [Cu = 64, S=32, O=16]
(A)  400
(B)  2.50
(C)  0.40
(D)  0.25

QUESTION 16
Coffee stains can best be removed by
(A)  kerosene
(B)  turpentine
(C)  a solution of borax in water
(D)  ammonia solution

QUESTION 17
Carbon (II) oxide is considered dangerous if inhaled mainly because it
(A)  can cause injury to the nervous system
(B)  competes with oxygen in the blood
(C)  competes with carbon (IV) oxide in the blood
(D) can cause lung cancer
2018 Jamb Questions and Answers on Chemistry

QUESTION 18
The acid that is used to remove rust is
(A) boric
(B) hydrochloric
(C)  trioxonitrate (V)
(D)  tetraoxosulphate (VI)

 

 

QUESTION 19
Calculate the volume of 0.5 mol dm-3 H2SO4 that is neutrialized by 25cm3 of 0.1 mol dm-3 NaOH.
(A) 5.0cm3
(B)  2.5cm3
(C)  0.4cm3
(D)  0.1cm3

QUESTION 20
The colour of methyl orange in alkaline mediums is
(A)  yellow
(B)  pink
(C)  orange
(D)  red

QUESTION 21
Which of the following salts is slightly soluble in water?
(A)  AgCI
(B)  CaSO4
(C)  Na2CO3
(D)  PbCl2

QUESTION 22
6AgNO3(aq) + PH3(g) + 3H2O(l)->6Ag(s) + H3PO3(aq) + 6HNO(3aq) . In the reaction above, the reducing agent is
(A) HNO3(aq)
(B)  H2O(l)
(C)  PH3(g)
(D)  AgNO3(aq)

QUESTION 23
The IUPAC nomenclature of the compound LiAIH is
(A)  lithium tetrahydridoaluminate (III)
(B) aluminium tetrahydrido lithium
(C)  tetrahydrido lithium aluminate (III)
(D)  lithium aluminium hydride

QUESTION 24
Iron can be protected from corrosion by coasting the surface with
(A)  gold
(B)  silver
(C)  copper
(D)  zinc

QUESTION 25
What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s?
[Al = 27, F = 96 500 C. mol-1]
(A)  0.2g
(B)  1.8g
(C)  5.4g
(D)  14.2g

QUESTION 26
In which of the following is the entropy change positive?
(A)  thermal dissociation of ammonium chloride
(B) Reaction between an acid and a base
(C)  addition of concentrated acid to water
(D)  dissolution of sodium metal in water

QUESTION 27
The colour of methyl orange in alkaline mediums is
(A)  yellow
(B)  pink
(C)  orange
(D)  red

QUESTION 28
In the preparation of oxygen by heating KCIO in the presence of MnO2, only moderate heat is needed because the catalyst acts by
(A)  lowering the pressure of the reaction
(B)  increasing the surface area of the reactant
(C)  increasing the rate of the reaction
(D)  lowering the energy barrier of the reaction

QUESTION 29
To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated teraoxosulphate (VI) acid confirmed the presence of
(A)  CO
(B)  CI-
(C)  SO-
(D)  NO

QUESTION 30
Which of the following is used as a rocket fuel?
(A)  HNO3
(B)  CH3COOH
(C)  H2SO4
(D)  HCI

QUESTION 31
A constituent common to bronze and solder is
(A)  lead
(B)  silver
(C) Copper
(D)  tin

QUESTION 32
When iron is exposed to moist air, it gradually rusts. This is due to the formation of
(A)  hydrated iron (III) oxide
(B)  anhydrous iron (III) oxide
(C)  anhydrous iron (II) oxide
(D)  hydrated iron (II) oxide

QUESTION 33
A compound gives an orange-red colour to a non-luminous flame. This compound is likely to contain
(A)  Na+
(B)  Ca2+
(C)  Fe3+
(D)  Fe2+

QUESTION 34
Stainless steel is used for making
(A)  magnets
(B)  tools
(C)  coins and medals
(D)  moving parts of clocks

QUESTION 35
The residual solids from the fractional distillation of petroleum are used as
(A)  coatings for pipes
(B)  raw materials for the cracking process
(C) fuel for driving tractors
(D)  fuel for jet engines

QUESTION 36
Which of the following is used as fuel in miners lamp?
(A)  Ethanal
(B)  Ethyne
(C)  Ethene
(D)  Ethane

QUESTION 37
Which of the following organic compounds is very soluble in water?
(A)  CH2COOH
(B)  C2H2
(C)  C2H4
(D)  CH3COOC2H5

QUESTION 38
Benzene reacts with hydrogen in the presence of nickel catalyst at 180oC to give
(A)  xylene
(B)  toluene
(C) cyclopentane
(D) cyclohexane

QUESTION 39
Which of the following is used to hasten the ripening of fruits?
(A)  Ethene
(B)  Ethanol
(C) Ethyne
(D)  Ethane

QUESTION 40
The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and
(A) tricholoromethane
(B)  dichloromethane
(C)  tetrachioromethane
(D)  chloromethane

QUESTION 41
One of the major uses of alkanes is
(A)  as domestic and industrial fuels
(B)  in the hydrogenation of oils
(C)  in the textile industries
(D)  in the production of plastics.

QUESTION 42
The haloalkanes used in the dry-cleaning industries are
(A)  trichloromethane and tetrachloromethane
(B)  chloroethene and dichloroethane
(C)  trichoroethene and tetrachloroethane
(D)  chloroethane and dichloroethene

QUESTION 43
Two hydrocarbons X and Y were treated with bromine water. X decolorized the solution and Y did not. Which class of compound does Y belong?
(A) Benzene
(B)  Alkynes
(C)  Alkenes
(D)  Alkanes

QUESTION 44
The compound that is used as an anaesthetic is
(A)  CCI2
(B)  BHCI3
(C)  Ch2CI2
(D)  CH2CI

QUESTION 45
when a few drops of water is added to a blue anhydrous cobalt (ii) chloride ,the colour changes to
(A)  white
(B)  pink
(C)  red
(D)  blue

QUESTION 46
the vulcanizers solution is prepared by dissolving rubber in
(A)  ethanol
(B)  kerosene
(C)  benzene
(D)  petrol

QUESTION 47
117.0 g of sodium chloride was dissolved in 1.0 dm3 of distilled water at 25oc .Determine the solubility in mol dm-3 of sodium chloride at that temperature[Na=23,Cl=35.5]
(A)  1.0
(B)  2.0
(C)  3.0
(D)  4.0

QUESTION 48
The uncovered raw food that is sold along major roads is likely to contain some amounts of
(A)  Pb
(B)  Cu
(C)  Ag
(D) Na

QUESTION 49
what is the PH of a 0.001 mol dm-3 solution of sodium hydroxide?
(A)  14
(B)  13
(C)  12
(D)  11

QUESTION 50
The basicity of CH3COOH is
(A)  1
(B)  2
(C)  3
(D)  4

ANSWERS

1 2b 3c 4d 5b 6b 7a 8b 9b 10a 11c 12a 13c 14b

15b 16d 17b 18d 19b 20a 21c 22c 23d 24d 25b

26a 27c 28d 29d 30b 31d 32a 33b 34c 35a 36b

37a 38d 39a 40c 41a 42c 43d 44b 45b 46c 47b 48a 49d 50a

 

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