2015 - JAMB Chemistry Past Questions and Answers - page 4
31
The leachate of a certain ash is used in local soap because it contain
A
sodium chloride and potassium hydroxide
B
sodium hydroxide
C
potassium hydroxide
D
soluble carbonates and hydrogen carbonate
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32
All these are electromagnetic waves except
A
White light
B
Photon
C
X-ray
D
Infrared
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33
Cu2S(s) + O2(g) = 2CU(s) + SO22(g)
A
+1 to 0
B
0 to +2
C
+2 to +1
D
0 to +1
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34
The number of isomers formed by C6H14 is
A
4
B
5
C
2
D
3
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35
There are basic particles from which matter called be made except
A
Salt
B
Atom
C
Ion
D
Molecule
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36
The energy value of petrol can be determined by
A
Bomb calorimeter
B
Catalytic cracker
C
Fractionating column
D
Thermometer
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37
What volume of 0.5mldm3 H2SO4 will exactly neutralize 20cm3 of 0.1moldm3 NaOH Solution?
A
2.0cm3
B
5.0cm3
C
6.8cm3
D
8.3cm3
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38
A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, Find the molecular formula [H = 1, C = 12, O = 16)
A
CH2O
B
C3H6O3
C
C6H12O6
D
C6H12O3
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39
An oxidation state of or in K2CrO7
A
7
B
6
C
5
D
4
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40
The elements that belong to the third period of periodic table are
A
Li, Be, Al and D
B
Na, P, O and Cl
C
B, C, N, and O
D
N2, Mg, S and Ar
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