2022 - JAMB Chemistry Past Questions and Answers - page 4
31
H\(^+\) + OH\(^-\) → H\(_2\)O
What does the equation above illustrate?
A
precipitation
B
hydration
C
hydrolysis
D
neutralization
32
Electrons enter into orbitals in order of increasing energy as exemplified by?
A
1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^2\)2pz\(^0\)3s\(^0\)
B
1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^1\)2pz\(^1\)3s\(^0\)
C
1S\(^2\)2S\(^2\)2PX\(^1\)2py\(^1\)2pz\(^1\)3s\(^1\)
D
1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^2\)2pz\(^0\)3s\(^1\)
33
Wrought iron is obtained by heating cast iron in a furnace with?
A
magnetite
B
haematite
C
carbon(ii)oxide
D
calcium trioxosilicate(iv)
34
In the extraction of iron, hot air is introduced into the blast furnace through?
A
valves
B
open-hearths
C
arcs
D
tuyeres
35
How many bonding pairs are present in carbon(iv)oxide?
A
4
B
3
C
2
D
1
36
2-methylprop-1-ene is a structural isomer of?
A
But-1-yne
B
2-methyl But-1-ene
C
3-methyl prop-1-yne
D
But-2-ene
37
Alkanes are used mainly for ___?
A
in the textile industry
B
in the hydrogenation of oils
C
as domestic and industrial fuels
D
as fine chemicals
38
What volume of (dm\(^3\)) of water will be added to 10dm\(^3\) of 2.0 mol/dm\(^3\) HCL acid solution to give a final solution of 0.5 mol/dm\(^3\)?
A
30
B
40
C
20
D
50
39
| Gas | CO\(_2\) | N\(_2\) |
O\(_2\) |
| % Volume | 4 | 72 | 24 |
The above table shows the compositions of the atmosphere of planet X. Which of these gases are present in higher percentages on earth?
A
CO\(_2\) and O\(_2\)
B
N\(_2\) and CO\(_2\)
C
CO\(_2\), O\(_2\) and N\(_2\)
D
O\(_2\) and N\(_2\)
40
Hard water is water with high concentrations of dissolved ions, in particular, calcium and
A
magnesium ions
B
nitrogen ions
C
phosporus ions
D
helium ions
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