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2003 - JAMB Chemistry Past Questions and Answers - page 1

1

What volume of oxygen is produced from the decomposition of 2 mole of KCIO3 at s.t.p?

[Molar volume of a gas at s.t.p = 22.4 dm3]

A
22.4 dm3
B
33.6 dm3
C
44.8 dm3
D
67.2 dm3
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2

Which of the following is physical change?

A
Burning kerosene
B
Freezing ice cream
C
Exposing white phosphorus
D
Dissolving calcium in water
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3

What is the percentage by mass of oxygen in Al2(SO4)3. 2H2O?

[Al = 27, S = 32, H = 1, O = 16]

A
14.29%
B
25.39%
C
50.79%
D
59.25%
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4

The filter in the cigarette reduces the nicotine content by

A
Burning
B
Adsorption
C
Evaporation
D
Absorption
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5

3Cu + pHNO3 →3Cu(NO)2 + 4H2 O + xNO

In the equation above, the values of p and x respectively are

A
1 and 3
B
2 and 3
C
6 and 2
D
8 and 2
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6

Neutral atoms of neon with atomic number 10 have the same number of electron as

A
O2+
B
Ca2+
C
K+
D
Mg2+
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7

The noble gases owe their inactivity to

A
Octet configuration
B
Cyclic shape
C
Hexagonal shape
D
Obtuse configuration
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8

According to the kinetic theory, an increase in temperature causes the kinetic energy of particles to

A
Decrease
B
Increase
C
Remain constant
D
Be zero
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9

I. H = 1s1 II. N = 1s2 2s2 p3 III. O = 1s2 2s2 p4 IV. Zn = 1s2 2s2 2p6 3s2 3p6 4s2 3d10

From the above, which of the following pairs is like to be paramagnetic?

A
I and II
B
I and III
C
I and IV
D
III and IV
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10

A gas exerts pressure on its container because

A
some of its molecules are moving faster than others
B
of the collision of the molecules with each other
C
of the mass of the molecules of gas
D
the molecules of a gas colide with the walls of the container
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