2003 - JAMB Chemistry Past Questions and Answers - page 2
11
When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes
A
negatively charged
B
positvely charged
C
neutral
D
bipolar
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12
The weakest attractive force that can be observed between two molecules is
A
ionic
B
covalent
C
coordinate covalent
D
van der Waals
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13
A consequence of global warming is
A
air pollution
B
water pollution
C
increased humudity
D
flooding
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14
Which of the following ions is acidic?
A
K+
B
KNO3-
C
S2-
D
H3O+
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15
The structural component that makes detergent dissolve more quickly in water than soap is
A
-SO3- Na+
B
-COO-Na-
C
-SO4- Na+
D
-COO-K+
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16
A liquid that will dissolve fat is
A
Hydrochloric acid
B
Calcium hydroxide
C
Kerosene
D
Water
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17
What mass of K2CrO4 is required to prepare 250cm3 of 0.020 mol dm3 solution?
[K2CrO4 = 194.2g mol-1]
[K2CrO4 = 194.2g mol-1]
A
0.97g
B
9.70g
C
19.42g
D
97.10g
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18
Farmlands affected by crude-oil spillage can be decontaminated by
A
Adding acidic solution
B
Using aerobic bacteria
C
Pouring water on the affected water area
D
Burning off the oil from the area
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19
When 10g of sodium hydroxide is dissolved in 1000cm3 of water, the sodium formed is approximately
[Na = 23, H = 1, O = 16]
[Na = 23, H = 1, O = 16]
A
0.01 mol dm-3
B
0.10 mol dm-3
C
0.25 mol dm-3
D
0.50 mol dm-3
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20
A change in temperature of a saturated solution disturb the equilibrium between the
A
Dissolved solute and the solvent
B
Solvent and undissolved solute
C
Dissolved solute and undissolved solute
D
Dissolved solute and the solution
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