The Joint Admissions and Matriculation Board (JAMB) is a Nigerian entrance examination board for tertiary-level institutions. JAMB conducts entrance examinations for prospective students seeking admission into Nigerian universities, polytechnics, and colleges of education. One of the subjects commonly taken by students in the JAMB examination is Chemistry.
As the saying goes, “practice makes perfect.” Therefore, it is important for students to practice with past questions to increase their chances of success in the examination. In this blog post, we will provide a comprehensive collection of the 2009 JAMB Chemistry past questions and answers to help students prepare effectively for the examination.
This resource will be helpful for students who are planning to take the JAMB examination or anyone who wants to improve their knowledge in Chemistry.
JAMB Chemistry Past Questions & Answers
1. A mixture of sugar and sulphur can be separated by
A
dissolution in water, evapouration and filtration
B
filtration, evaporation and dissolution in water
C
dissolution in water, filtration and evaporation
D
evaporation, dissolution in water and filtration
CORRECT OPTION: c
2. Which of the following is a physical change?
A
Freezing ice cream
B
dissolving calcium in water
C
burning kerosene
D
Exposing white phosphorus to air
CORRECT OPTION: a
3. The percentage of water of crystallization in ZnSO4.7H2O is
[Zn = 65, S = 32, O = 1, H = 1]
A
33%
B
44%
C
55%
D
87%
CORRECT OPTION: b
4. 0.0075 mole of calcium trioxocarbonate (IV) is added to 0.015 mole of a solution of hydrochloric acid. The volume of gas evolved at s.t.p is
[Molar volume of a gas at s.t.p = 22.4 dm3]
A
224cm3
B
168cm3
C
112cm3
D
100cm3
5. A gas exerts pressure on its container because
A
the molecules of a gas collide with the walls of the container
B
some of the molecules are moving faster than others
C
of the collisions of the molecules with each other
D
of the mass of the molecules of the gas
CORRECT OPTION: a
6. The basic assumption in the kinetic theory of gases that the collisions of the gaseous molecules are perfectly elastic implies that the
A
forces of attraction and repulsion are in equilibrium
B
gaseous molecules can occupy any available space
C
gaseous molecules will continue their motion indefinitely
D
gases can be compressed
CORRECT OPTION: c
7. If an atom is represented as 1123�, which of the following deduction is correct?
A
it contains 12 protonic
B
it forms a covalent chloride
C
its atomic number is 23
D
it is an alkali metal
CORRECT OPTION: d
8. Cathode rays causes an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays
A
are positively charged
B
are negatively charged
C
have mass
D
travel in straight lines
CORRECT OPTION: d
9. Which quantum number divides shells into orbitals?
A
principal
B
Arzimuthal
C
Magnetic
D
Spin
CORRECT OPTION: b
10. The type of bonding in {Cu(NH3)4}2+ is
A
coordinate
B
electrovalent
C
metallic
D
covalent
CORRECT OPTION: a
11. The mixture of gases used in a photographer’s flash tube is
A
argon and krypton
B
krypton and xenon
C
helium and argon
D
argon and xenon
CORRECT OPTION: b
12. When sodium trioxocarbonate (IV) decahydrate loses its water of crystallization to the atmosphere, the process is
A
deliquescence
B
efflorescence
C
hygroscopic
D
effervesecence
CORRECT OPTION: b
13. Water can be obtained as the only product during the
A
combustion of hydrocarbons
B
neutraliization of an acid by base
C
combustion of hydrogen
D
electrolysis of brine
CORRECT OPTION: c
14. If 10.5g of lead (II) trioxonitrate (V) is dissolved in 20cm3 of distilled water at 18oC, the solubility of the solute in mol dm-3 is
[Pb = 207, N = 14, O = 16]
A
1.60
B
5.25
C
16.00
D
525.00
CORRECT OPTION: a
15. For a given solute, the concentration of its saturated solution in different solvents are
A
the same at the same temperature
B
different at the same temperature
C
the same at different temperature
D
constant
CORRECT OPTION: b
16. The major source of oxides of nitrogen is from the burning of
A
coal
B
wood
C
fuel
D
chlrofluorocarbons
CORRECT OPTION: c
Nitrogen oxides form when fuel is burned at high temperatures
17. The acid used in electrolysis of water is dilute
A
HNO3
B
CH3COOH
C
H2SO4
D
HCl
CORRECT OPTION: c
18. What volume of 1.5M solution of KOH would contain 0.045 moles
A
67.50 cm3
B
30.00 cm3
C
6.75 cm3
D
3.00 cm3
CORRECT OPTION: b
19. The salt formed from a reaction between citric acid and sodium hydroxide in solution will be
A
acidic
B
basic
C
complex
D
neutral
CORRECT OPTION: b
20. The colour changes observed when testing for reducing agents using acidified potassium heptaoxodichromate (IV) solution is
A
yellow to purple
B
orange to green
C
green to orange
D
purple to yellow
CORRECT OPTION: b
21. The oxidation state of Cr in K2Cr2O7 is
A
+7
B
+6
C
+5
D
4
CORRECT OPTION: b
22. Which of the following metals is purified commercially by electrolysis?
A
Zn
B
Fe
C
Sn
D
Cu
CORRECT OPTION: d
23. What current will deposit 3.25g of zinc in 2hrs?
[Zn = 65, F = 96500 mol–]
A
3.25A
B
2.00A
C
1.34A
D
0.67A
CORRECT OPTION: c
24. C(s) + H2O(g) ? H2(g) + CO2(g)
?G for the reaction above at 1300k is -43KJ. At this temperature, the reaction is
A
not feasible
B
at equilibrium
C
feasible
D
exothermic
25. Two equal bulbs, one containing ammonia and the other nitrogen are opened mouth – to – mouth to each other at room temperature. The entropy in the mixture of gases is likely to
A
remain unchange
B
increase
C
decrease
D
change
CORRECT OPTION: a
26.
In the diagram above, which of the curves represents the evolution of oxygen with time in the equation 2KClO3(s) ? 2KCl(s) + 3O2(g)?
A
X
B
Y
C
Z
D
R
CORRECT OPTION: c
27. A catalyst increase the rate of a chemical reaction by providing a path that
A
raise the activiation energy
B
increase the temperature
C
lowers the activation energy
D
increase the concentration
CORRECT OPTION: c
28. CuO(s) + H2(g) ? Cu(s) + H2O(l)
What is the effect of increasing the pressure on the equilibrium reaction above?
A
The equilibrium is shifted to the left
B
The equilibrium is shifted to the right
C
There is no effect
D
More H2(g) is produced
CORRECT OPTION: c
29. The equilibrium of an endothermic reaction which proceeds with an increase in volume can be shifted in the reverse direction by
A
increasing the temperature and decreasing the pressure
B
increasing the pressure and increasing the temperature
C
decreasing the temperature and increasing the pressure
D
decreasing the pressure and decreasing the temperature
CORRECT OPTION: c
30. The oxidation of ammonia in excess air produces
A
NO
B
N2O
C
NO2
D
N2O4
CORRECT OPTION: a
31. Hydrogen sulphide gas can act as
A
an oxidizing agent
B
a dehydrating agent
C
a bleaching agent
D
a precipitating agent
CORRECT OPTION: d
32. The gasification of coke is used for the manufacturing of
A
producer gas
B
natural gas
C
synthetic gas
D
industrial gas
CORRECT OPTION: c
33. The gas that is most useful in protecting humans against solar radiation is
A
chlorine
B
ozone
C
carbon (IV) oxide
D
hydrogen sulphide
CORRECT OPTION: b
34. Which of the following allotrope of carbon is a constituent of a lead pencil?
A
Graphite
B
Diamond
C
Lampblack
D
Soot
CORRECT OPTION: a
35. which of the following metals will show the highest metallic character?
A
Zinc
B
Copper
C
Barium
D
Calcium
CORRECT OPTION: d
36. Copper metal dissolves in concentrated trioxonitrate (V) acid with the resultant evolution of
A
CO2
B
SO2
C
NO2
D
CO
CORRECT OPTION: c
37. The type of iron that is best suited for welding, making nails, chains and iron rods is
A
pig iron
B
wrought iron
C
cast iron
D
iron pyrites
CORRECT OPTION: b
38. In the electrolytic extraction of aluminum, the function of the molten cryolite is to
A
precipitate aluminium hdroxide
B
lower the melting point of aluminium oxide
C
act as a raw materials
D
act as a solvent
CORRECT OPTION: b
39. One of the products of the thermal decomposition of sodium trioxonitrate (V) is
A
sodium
B
nitrogen
C
sodium dioxonitrate (III)
D
sodium oxide
CORRECT OPTION: c
40. A cracking process in petroleum refining can be represented by
A
heptane to heptene
B
heptane to 3-methylhexane
C
heptane to propene and butane
D
heptane to 2,3,3-trimethybutane
CORRECT OPTION: c
41
Which of the following molecules has two other positional isomers?
A
CH3CH2Br
B
CH3CHBrCH3
C
CBr2F2
D
CH2CHBrCH2Br
CORRECT OPTION: d
42. Which of the following class of compounds can exist as dipolar ions in solution?
A
Alkanoic acid
B
Fatty acids
C
Dialkanoic acids
D
Amino acids
43. Lucas reagent is used to test for
A
alkanes
B
alkanoic acids
C
alkanols
D
amines
CORRECT OPTION: c
44. A compound commonly used for sterilization and preservation of specimens and food is
A
ethanol
B
benzene
C
ether
D
ammonia
CORRECT OPTION: a
45. An organic compound reacted with bromine water to give a colourless solution. The compound is probably an
A
alkene
B
alkanal
C
alkyne
D
alkanone
46. Which of the following hydrocarbons is mainly used as fuel?
A
Methylene
B
Ethylene
C
Methane
D
Ethyne
CORRECT OPTION: c
47. The molecular formula of a common organic laboratory anaesthetic is
A
CHCl3
B
CHI3
C
CCl4
D
CHF3
CORRECT OPTION: a
48. The simplest branched-chain hydrocarbon is
A
ethane
B
ethene
C
propane
D
butane
CORRECT OPTION: d
49. Organic molecules that have the suffix-ene are unsaturated hydrocarbons that have
A
a single bond
B
a double bond
C
a triple bond
D
an ionic bond
CORRECT OPTION: b
50. If the relative molecular mass of an element is not a whole number, it can be deduced that the element is
A
Naturally radioactive
B
abundant in nature
C
a transition metal
D
an isotopic mixture
CORRECT OPTION: d