2004 - JAMB Chemistry Past Questions and Answers - page 1
1
When a solid substance disappears completely as a gas on heating, the substance is said to have undergone
A
evaporation
B
distillation
C
crystallization
D
sublimation
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2
A chemical reaction is always associated with
A
an increase in the composition of one of the substance
B
a change in the volume of the reactants
C
a change in the nature of the reactants
D
the formation of new substance
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3
If a solution contains 4.9g of tetraoxosulphate (VI) acid, calculate the amount of copper (II) oxide that will react with it
[Cu = 64, O = 16, S = 32, H = 1]
[Cu = 64, O = 16, S = 32, H = 1]
A
0.8g
B
4.0g
C
40.0g
D
80.0g
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4
What volume of gas is evolved at S.t.p if 2g of calcium trioxocarbonate (IV) is added to a solution of hydrochloric acid?
[Ca = 40, C = 12, O = 16, Cl = 35.5, H = 1 Molar volume of agas at s.t.p = 22.4 dm3
[Ca = 40, C = 12, O = 16, Cl = 35.5, H = 1 Molar volume of agas at s.t.p = 22.4 dm3
A
112 cm2
B
224 cm2
C
448 cm2
D
2240 cm2
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5
According to charles' law, the volume of a gas becomes zero at
A
0 oC
B
-100 oC
C
-273 oC
D
-373 oC
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6
It is difficult to achieve an orderly arrangement of the molecules of a gas because they
A
have no definite shape
B
have little force of attraction between them
C
can collide with one another in the container
D
are too small in size
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7
A given volume of methane diffuses in 20s. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions?
[C = 12, H = 1, S = 32, O = 16
[C = 12, H = 1, S = 32, O = 16
A
5s
B
20s
C
40s
D
60s
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8
An electron can be added to a halogen atom to form a halide ion with
A
2 valence electrons
B
3 valence electrons
C
7 valence electrons
D
8 valence electrons
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9
The shape of s-orbitals is
A
spherical
B
elliptical
C
spiral
D
circular
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10
22688Ra → x86Rn + α - particle
What is the value of x in the nuclear reaction above?
What is the value of x in the nuclear reaction above?
A
220
B
222
C
226
D
227
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