2005 - JAMB Chemistry Past Questions and Answers - page 3
21
The solubility curve shows the variation of solute concentration with
A
volume
B
temperature
C
vapour density
D
pressure
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22
The air around smelting industries is likely to contain
A
H2S, CO and N2
B
CO2, SO3 and H2
C
H2, SO2 and CO2
D
SO2, N2 and CO2
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23
Kerosine is commonly used to remove the red colour stain of palm oil from cloths because it
A
helps to spread the oil over a larger surface area
B
react with the oil to form an odourless compound
C
makes the oil evaporate easily by dissolving it
D
helps to dilute the oil and reduce its colour
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24
The gas that is the most dangerous pollutant to human is
A
sulphur (IV) oxide
B
carbon (IV) oxide
C
nitrogen (II) oxide
D
hydrogen sulphide
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25
Natural water collected from rivers and ponds contain oxygen, carbon (IV) oxide and
A
nitrogen
B
hydrogen
C
chlorine
D
sulphur
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26
How many moles of limestone will be required to produce 5.6g of CaO?
[Ca = 40, C = 12, O= 16]
[Ca = 40, C = 12, O= 16]
A
0.20 mol
B
0.10 mol
C
1.12 mol
D
0.56 mol
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27
The shape of the hydrocarbon compound CH4 is
A
square planar
B
planar
C
linear
D
tetrahedral
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28
Which of these properties gives a solid its definite shape?
A
strong intermolecular attraction
B
high melting point
C
high boiling point
D
weak intermolecular attraction
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29
Sugar is separated from its impurities by
A
precipitation
B
crystallization
C
distillation
D
evaporation
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30
The component of an atom that contributes least to its mass is the
A
proton
B
nucleus
C
neutron
D
electron
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