1999 - JAMB Chemistry Past Questions and Answers - page 2
11
The method that can be used to convert hard water to soft water is
A
chlorination
B
passage over activated charcoal
C
the use of an ion-exchange resin
D
aeration
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12
1s2, 2s2, 2p6, 3s2, 3p6, 3d7, 4s2
An element with the electronic configuration above is a
An element with the electronic configuration above is a
A
non-metal
B
metal
C
transition element
D
group two element
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13
Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond?
A
HF(g)
B
NH3(g)
C
CH4(g)
D
HCl(g)
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14
0.25 mole of hydrogen chloride was dissolved in distilled water and the volume made up of 0.50 dm3. If 15.0 cm3 of the solution requires 12.50 cm3 of aqueous sodium trioxocarbonate (IV) for neutralization, calculate the concentration of the alkaline solution
A
0.30 mol dm3
B
0.40 mol dm3
C
0.50 mol dm3
D
0.60 mol dm3
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15
The correct order of increasing oxidation number of the transition metal ions for the compounds K2Cr2O7, V2O5 and KMnO4 is
A
V2O5 < K2Cr2O7 < KMnO4
B
K2Cr2O7 < KMnO4 < V2O5
C
KMnO4 < K2Cr2O7 < V2O5
D
KMnO4 < V2O5 < K2Cr2O7
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16
The set of pollutants that is most likely to be produced when petrol is accidentally spilled on plastic materials and ignited is
A
CO, CO2 and SO2
B
CO, HCL and SO2
C
CO, CO2 and HCL
D
SO2, CO2 and HCL
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17
What is observed when aqueous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together?
A
A white precipitate is formed
B
A green precipitate is formed
C
The mixture remains colourless
D
The mixture turns reddish brown
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18
The solution with the lowest pH value is
A
5 ml of (m/10) HCL
B
10 ml of (m/10) HCL
C
15 ml of (m/5) HCL
D
20 ml of (m/8) HCL
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19
The solubility product of Cu(IO3)2 is 1.08 * 10-7. Assuming that neither ions react appreciable with water to form H+ and OH-, what is the solubility of this salt?
A
2.7 * 10-8 mol dm-3
B
9.0 * 10-8 mol dm-3
C
3.0 * 10-3 mol dm-3
D
9.0 * 10-3 mol dm-3
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20
The entropy and enthalpy of a system are a measure of
A
degree of disorderlinesss and heat content respectively
B
heat content and degree of disorderliness respectively
C
heat content of a system only
D
degree of disorderliness only
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