Complete 2007 JAMB Chemistry Past Questions and Answers

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 2007 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.

2007 JAMB Chemistry Past Questions

1
Trioxonitrate (V) acid is not used for preparing hydrogen gas from metals because it
A
is strongly oxidizing
B
is volatile
C
renders the metal passive
D
forms a layer of oxide on the metal
CORRECT OPTION: a
2
An element used in the production of matches is
A
nitrogen
B
aluminium
C
copper
D
sulphur
CORRECT OPTION: d
3
When calcium oxide is heated with carbon, the oxide will
A
be converted to carbide
B
be converted to the trioxocarbonate (IV) salt
C
decompose to the metal
D
melt,producingg carbon (IV) oxide
CORRECT OPTION: a
4
A solution which on treatment with hydrochloric acid produces a colourless, odourless gas which turns lime water milky is most likely to be a
A
trioxonitrate (V)
B
chloride
C
trioxocarbonate (IV)
D
hydroxide
CORRECT OPTION: c
5
The soft solder used for welding and plumbing is alloy of
A
lead and tin
B
iron and tin
C
lead and zinc
D
iron and zinc
6
The reddish-brown rust on iron roofing sheets consists of
A
Fe3+(H2O)6
B
FeO.H2O
C
Fe2O3.3H2O
D
Fe3O4.2H2O
CORRECT OPTION: c
7
Na2S2O3(aq) + 2HCl(aq) ? 2NaCl(aq) + H2O(l)
Which of the following would introduce the greatest increase in the rate of the chemical reaction above?
A
An increase in temperature and decrease in the concentration of the reactant
B
A decrease in the volume and increase in the pressure of the reactant
C
A decrease in the temperature and an incease in the concentration of the reactant
D
An increase in temperature and an increase in the concentration of the reactant
CORRECT OPTION: d
8
The tincture of iodine means iodine dissolved in
A
ethanol
B
bromine chloride
C
chlorine water
D
water
10
Copper and silver metals are commonly use as coin because they are
A
easily reduced
B
not easily reduced
C
easily oxidized
D
not easily oxidized
CORRECT OPTION: d

11
Which of the following sets of metals dissolves in dilute HCl?
A
Fe, Sn and Cu
B
Mg, Fe and Cu
C
Mg, Sn and Fe
D
Cu, Mg and Sn
CORRECT OPTION: c
12
If chlorine is bubbled into water and the resulting yellowish-green solution is exposed to bright sunlight for a while, the solution will decompose giving out
A
oxygen and leaving behind aqueous hydrochloric acid
B
chlorine and oxygen
C
oxygen, hydrogen and chlorine
D
oxygen, thereby producing hypochlorous acid
13
H3PO4(aq) + H2O(l) ? H2PO4(aq) + H3O+(aq)
?H = -13kJ at 298K
In the reaction above, an increase in temperature would
A
slow downthe reverse reaction
B
have no effect on the reaction
C
favour the reverse reaction
D
favour the forward reaction
CORRECT OPTION: c
14
The reaction that takes place in Daniell cell is
A
direct combination
B
redox
C
double decomposition
D
neutralization
CORRECT OPTION: b
15
What happens when zinc rod is immersed in copper (II) tetraoxosulphate (VI) solution/
A
The blue colour of the solution disappears
B
Electrons flow from copper to zinc
C
The zinc rod remain undissolved
D
The copper generate more copper ions
CORRECT OPTION: a
16
C2H4(g) + H2(g) ? C2H6(g) ?H = -137kJ mol-1
The reaction represented above is
A
exothermic
B
spontaneous
C
endothermic
D
in equilibrium
CORRECT OPTION: a
17
How long would it take to deposit 0.08g of copper from CuCl2 solution by passing a current of 0.5A?
[Cu = 64, F = 96500 C mol-1]
A
6 mins
B
8 mins
C
24 mins
D
48 mins
CORRECT OPTION: b
Cu2+ + 2e ? Cu(s)
2 * 96500C deposit 64g of Cu
x quantity of electricity wil deposit 0.08
x = (2 * 96500 * 0.08)/64 =241.25 coulomb.
Q = It
241.25 = 0.5t
t = 241.25/60 = 8 mins
18
tartaric acid is used industrially to
A
make baking powder
B
make fruit juices
C
remove rust
D
dry substance
CORRECT OPTION: a
19
The salt formed from strong acid and a strong base is
A
complex
B
neutral
C
basic
D
acidic
20
Dissolving some pellets of NaOH in water would result in
A
a decrease in the free energy of the solution
B
a decrease in the entropy of the solution
C
a lowering of the temperature of te solution
D
an increase in the entropy of the solution
CORRECT OPTION: d
21
Calculate the number of moles of HCl present in 20cm3 of a 0.75M solution of the acid
A
0.015 mole
B
0.038 mole
C
3.800 moles
D
1.500 moles
CORRECT OPTION: a
Number of moles = (conc. in mol/dm3*volume in cm3)/1000
(0.75 * 20)/100 = 0.015 mole
22
The oxidation state of oxygen in tetraoxosulphate (VI) acid is
A
-4
B
-2
C
+4
D
-8
CORRECT OPTION: b
H2SO4
(O.N of hydrogen * 2 ) + O.N of sulphur + O.N of oxygen * 4 = 0
? 1 * 2 + 6 + 4x = 0
2 + 6 + 4x = 0
8 + 4x = 0
4x 0 – 8 = -8
4x = -8
x = -8/4 = -2
23
MnO2(s) + xHCl(aq) ? MnCl2(aq) + yH2O(l) + zCl2(g)
In theequation above, what are the values of xy and z respectively
A
2, 1, 2
B
4, 1, 2
C
4, 2, 1
D
1, 2, 1
CORRECT OPTION: c
24
Calculate the mass of chlorine gas which occupies a volume of 1.12dm3 at s.t.p
[Cl = 35.5, molar volume of gas at s.t.p = 22.4 dm3
A
15.50 g
B
7.10 g
C
3.55 g
D
1.80 g
CORRECT OPTION: c
2 * 35.5g of chlorine has a volume of 22.4 dm3 at s.t.p
xg of chlorine will have a volume of 1.12 dm3
x = (1.12 * 35.5 * 2)/22.4 = 3.55g
26
What is the volume of oxygen required to burn complete 45 cm3 of methane at s.t.p?
A
135.0 cm3
B
180.0 cm3
C
45.0 cm3
D
90.0 cm3
CORRECT OPTION: d
CH4(g) + 2O2(g) ? 2H2O(g) + CO(g)
1 volume of methane will react with 90 cm3 of oxygen at s.t.p
27
How many electrons are in the L shell of 3115P?
A
5
B
8
C
18
D
2
CORRECT OPTION: b
28
If the electron configuration of a element is p1s2 2s2 2P5, how many unpaired electron are there?
A
2
B
8
C
1
D
4
CORRECT OPTION: c
29
Which of the following decrease when a given mass of gas is compressed to half its initial volume?
A
Atomic radius of each
B
Average intermolecular distance
C
Frequency of collisions
D
Number of molecules presents
CORRECT OPTION: b
30
the elements that belong to the third period of the periodic table are
A
Li, Be, Al and P
B
Na, P, O and Cl
C
B, C, N and O
D
Nz, Mg, S and Ar
CORRECT OPTION: d
31
A metal X forms two bromides with the formulae XBr2 and XBr3. What type of bonding exists between X and bromine in the bromide?
A
Ionic bonding
B
Metallic bonding
C
Dative bonding
D
Covalent bonding
CORRECT OPTION: a
32
A mixture of petrol and water can be separated through
A
centrifugation
B
distillation
C
the use of separating funnel
D
the use of filter paper
CORRECT OPTION: c
33
Which of the following represents an aromatic compound?
A
C6H5OH
B
C6H12
C
C6H9OH
D
C6H8
CORRECT OPTION: a
35
Which of the following compounds is the best possible anti-knock agent for petrol?
A
(CH3)2CH – CH(CH3)CH2CH3
B
CH3CH2(CH3)CHCH2CH2CH3
C
CH3CH2(CH3)CHCH2CH2CH3
D
(CH3)3C – CH2CH2CH3
CORRECT OPTION: a
36
The hydrocarbon used in the production of styrene is
A
ethyne
B
propyne
C
ethane
D
ethene
CORRECT OPTION: d
37
How many structural isomers of chlorobutane are possible?
A
4
B
3
C
2
D
1
CORRECT OPTION: a
38
The conversion of open chain alkanes into cycloalkanes and aromatic compounds is called
A
cracking
B
reforming
C
isomerization
D
polymerization
CORRECT OPTION: b
39
Which of the following alkanes has the highest boiling point?
A
Pentane
B
Ethane
C
Propane
D
Methane
CORRECT OPTION: a
40
Certain useful waxes are composed mainly of
A
amino acids
B
glycerols
C
alkanols
D
alkanoates
CORRECT OPTION: b
41
The IUPAC nomenclature of compound CH3CH2COOCH2CH3 is
A
propyl ethanoate
B
ethyl butanoate
C
ethyl propanoate
D
methyl butanoate
CORRECT OPTION: c
42
When temporary hard water is boiled for sometime in a kettle, the inner surface of the kettle becomes coated with a deposit of
A
calcium tetraoxosulphate(VI)
B
calcium trioxocarbonate (IV)
C
calcium hydrogentrioxocarbonate (IV)
D
aluminium trioxocarbonate (IV)
CORRECT OPTION: b
43
A supersaturated solution is said to contain
A
more solute than it can dissolve at that temperature in the presence of undissolved solute
B
as much solute as it can dissolve at that temperature in the presence of undissolved solute
C
as much solute as it can dissolve at that temperature
D
more solute than it can dissolve at that temperature
CORRECT OPTION: d
44
The presence of nitrogen in air is to slow down
A
respiration and combustion
B
combustion and corrosion
C
corrosion and respiration
D
respiration and transpiration
CORRECT OPTION: b
45
A good drying agent should be
A
deliquescent
B
effervescent
C
hygroscopic
D
efflorescent
CORRECT OPTION: c
46
Smog usually occurs over cities which
A
burn a lot of fossil fuels
B
have very few plants
C
are surrounded by water
D
are overpopulated
CORRECT OPTION: a
47
What weight of NaCl is needed to make 2.0 dm3 of a 1.5M solution?
[Na = 23, Cl = 35.5]
A
116 g
B
175 g
C
87 g
D
58 g
CORRECT OPTION: b
Molar mass of Nacl = 23 + 35.5 = 58.5 g/mol
Number of moles of Nacl = conc. in mol/dm3
x vol. in dm3
= 1.5 * 2.0 = 3.0 moles
1 mole of NaCl has a weight of 58.5 * 3
= 175.5g

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