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2009 - JAMB Chemistry Past Questions and Answers - page 1

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
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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
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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%
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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
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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
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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
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7

If an atom is represented as ( _{11}^{23}X ), 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
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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
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9

Which quantum number divides shells into orbitals?

A
principal
B
Arzimuthal
C
Magnetic
D
Spin
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10

The type of bonding in {Cu(NH3)4}2+ is

A
coordinate
B
electrovalent
C
metallic
D
covalent
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