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]
[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
correct option: d
2KClO3 → 2KCl + 3O2
3 moles of oxygen is produced
1 moles of oxygen is 22.4 dm3
3 moles of oxygen is 67.2 dm3
Users' Answers & Comments3 moles of oxygen is produced
1 moles of oxygen is 22.4 dm3
3 moles of oxygen is 67.2 dm3
2
Which of the following is physical change?
A
Burning kerosene
B
Freezing ice cream
C
Exposing white phosphorus
D
Dissolving calcium in water
correct option: b
Users' Answers & Comments3
What is the percentage by mass of oxygen in Al2(SO4)3. 2H2O?
[Al = 27, S = 32, H = 1, O = 16]
[Al = 27, S = 32, H = 1, O = 16]
A
14.29%
B
25.39%
C
50.79%
D
59.25%
correct option: d
Al2(SO4)3. 2H2O
2 * 27 + 3*32 + 14 * 16 + 4 * 1 =
54 + 96 + 224 + 4 = 378
% O2 = (224/378) * (100/1) = 59.25%
Users' Answers & Comments2 * 27 + 3*32 + 14 * 16 + 4 * 1 =
54 + 96 + 224 + 4 = 378
% O2 = (224/378) * (100/1) = 59.25%
4
The filter in the cigarette reduces the nicotine content by
A
Burning
B
Adsorption
C
Evaporation
D
Absorption
correct option: b
Users' Answers & Comments5
3Cu + pHNO3 →3Cu(NO)2 + 4H2 O + xNO
In the equation above, the values of p and x respectively are
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
correct option: d
Users' Answers & Comments6
Neutral atoms of neon with atomic number 10 have the same number of electron as
A
O2+
B
Ca2+
C
K+
D
Mg2+
correct option: d
Users' Answers & Comments7
The noble gases owe their inactivity to
A
Octet configuration
B
Cyclic shape
C
Hexagonal shape
D
Obtuse configuration
correct option: a
Users' Answers & Comments8
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
correct option: b
Users' Answers & Comments9
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?
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
correct option: a
Users' Answers & Comments10
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
correct option: d
Users' Answers & Comments