1994 - JAMB Chemistry Past Questions and Answers - page 4

31
2HCL(ag) + CaCO3(ag) → CaCL2(ag) + H2O(1) + CO from the reaction above, which of the following curves represents the consumption of calcium trioxocarbonate (IV) as dilute HCL is added to it?
A
L
B
M
C
N
D
P
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32
In the diagram above, R is a mixture of
A
potassium tetraxochlorate (VII) and concentrated H2SO4
B
potassium trioxochlorate (V) and concentrated H2SO4
C
potassium tetratoxomanganate (VII) and concentrated HCI
D
manganes (IV) oxide and concentrated HCI
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33
The IUPAC name of the compound above is
A
2,2-dimethyl but -1-yne
B
2,2-dmethyl but -1-ene
C
3,3-dimethyl but -1-ene
D
3,3-dimethyl but-1-yne
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34
Use the diagram above to answer this question. The reaction taking place in flask G is known as
A
hydrolysis
B
double decomposition
C
dehydration
D
pyrolysis
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35
MnO4(aq) + 8H + 5Fe2+ \(\to\) Mn2+(aq) + 5Fe3+(aq) + H2O. The oxidation number of maganese in the above reaction changed from
A
+7 to +2
B
+6 to +2
C
+5 to +2
D
+4 to +2
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36
which of these metals CANNOT replace hydrogen from alkaline solutions?
A
Aluminium
B
Zinc
C
Tin
D
Iron
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37
Clothes should be properly rinsed with water after bleaching because
A
the bleach decolourizes the clothes
B
chlorine reacts with fabrics during bleaching
C
the clothes are sterilized during bleaching
D
hydrogen chloride solution is produced during bleaching
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38
A mixture of sand, ammonium chloride and sodium chloride is best separated by?
A
sublimation followed by addition of water and filteration
B
sublimation followed by addition of water and evaporation
C
addition of water followed by filtration and sublimation
D
addition of water followed by crystallization and sublimation
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39
A pure solid usually melts?
A
over a wide range of temperature
B
over a narrow range of temperature
C
at a lower temperature than the impure one
D
at the same temperature as the impure one
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40
At the same temperature and pressure, 50 cm3 of nitrogen gas contains the same number of molecules as?
A
25 cm3 of methane
B
40 cm3 of hydrogen
C
50 cm3 of ammonia
D
100 cm3 of chlorine
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