2006 - JAMB Chemistry Past Questions and Answers - page 3
21
When 50cm2 of a saturated solution of sugar of molar mass 342 g at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is
A
2.0 mol dm-3
B
3.5 mol dm-3
C
7.0 mol dm-3
D
10.0 mol dm-3
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22
Which of the following results in the fall of acid rain?
A
Oxides of lead
B
Particulate matter
C
Oxides of sulphur
D
Gaseous hydrocarbon
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23
Water has the ability to dissolve almost all substance because its molecules has a structure with
A
one positive end and one neutral end
B
one positive end and one negative end
C
two negative ends
D
two positive ends
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24
When a crystal was added to the clear solution of its salt, the crystal did not dissolve and the solution remained unchange. This showed that the solution was
A
supersaturated
B
concentrated
C
unsaturated
D
saturated
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25
A particle that contains 11 protons, 12 neutrons and 10 electrons is probably a
A
neutral non-metal
B
metallic ion
C
non-metallic ion
D
neutral metal
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26
A difference between chemical and physical change is that in a chemical change
A
oxygen is consumed
B
heat is supplied
C
a reversible process oocurs
D
a new substance is formed
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27
The volume of 2.5 moles of oxygen at s.t.p is
[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
50.0 dm3
B
84.0 dm3
C
28.0 dm3
D
56.0 dm3
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28
Nuclear fission involves the splitting of a heavy element into two nuclei of
A
nearly equal masses with a relaese of energy and radiaton
B
equal masses with a relaese of energy
C
equal masses with a release of energy and radiation
D
unequal masses without any relaese of energy
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29
What is the molar mass of a substance, if 0.4 mole of the substance has a mass of 25.0g?
A
62.5 g
B
40.0 g
C
6.3 g
D
2.5 g
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30
The element with the electron configuration 1s22s22p3 is
A
calcium
B
chlorine
C
oxygen
D
nitrogen
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