2002 - JAMB Chemistry Past Questions and Answers - page 1
1
A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formula of the compound?
[K = 39, Cl = 35.5, O = 16]
[K = 39, Cl = 35.5, O = 16]
A
KClO4
B
KClO
C
KClO2
D
KClO3
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2
The formula CH2 for ethanoic acid is regarded as its
A
Molecular formula
B
General formula
C
Empirical formula
D
Structural formula
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3
A little quantity of trichloromethane (b.pt 60,oC) was added to a large quantity of ethanol (b.pt 78,oC). The most probable boiling point of the resultant mixture is from
A
69 oC - 70 oC
B
70 oC – 74 oC
C
82 oC – 84 oC
D
60 oC – 78 oC
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4
The chromatography separation of ink is based on the ability of the components to
A
React with solvent
B
React with each other
C
Dissolve in each other in the column
D
Move at different speeds in the column
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5
In the reaction E+F ↔ G+H, the backward reaction is favoured if the concentration of
A
F is increased
B
E is increased
C
E is reduced
D
G is reduced
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6
What amount of mercury would be liberated if the same quantity of electricity that liberates 0.65g of zinc is applied?
A
2.01g
B
1.00g
C
4.02g
D
8.04g
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7
Which of the following equations show that a reaction is in equilibrium?
A
ΔG < O
B
ΔG = ΔH – TΔS
C
ΔG > O
D
ΔG = O
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8
PCl5(g) ↔ PCl3(g) + Cl2(g)
In the reaction above, a decrease in pressure will
In the reaction above, a decrease in pressure will
A
Decelerate the reaction
B
Increase the yield of PCl3
C
Increase the yield of PCl5
D
Accelerate the reaction
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9
When H2S is passed into a solution of iron (III) chloride, the solution turns
A
Pale green
B
Pale red
C
Brown
D
Colourless
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10
The Arrhenius equation expresses the relationship between the speed of a reaction and its
A
Molecular collision
B
Heat of reaction
C
Catalyst
D
Activation energy
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