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1994 - JAMB Chemistry Past Questions and Answers - page 1

1

A major effect of oil pollution in coastal waters is the?

A
destruction of marine life
B
desalination of the water
C
increase in the acidity of the water
D
detoxification of the water
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2

Sodium chloride has no solubility product value because of its?

A
saline nature
B
high solubility
C
low solubility
D
insolubility
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3

The solubility, in moles per dm3 of 20.2 g of potassium trioxonitrate (V) dissolve in 100 g of the resulting mixture is?

(K = 39, O = 16, N =14).

A
0.10
B
0.20
C
1.00
D
2.00
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4

Which of the following atoms represents deuterium?

A
No protons = 1, No of neutrons = 0, No of electrons = 0
B
No protons = 1, No of neutrons = 0, No of electrons = 1
C
No protons = 1, No of neutrons = 1, No of electrons = 1
D
No protons = 1, No of neutrons = 2, No of electrons = 1
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5

A few drops of concentrated PCI are added to about 10cm3 of a solution of pH 3.4. The pH of the resulting mixtures is?

A
less than 3.4
B
greater than 3.4
C
unaltered
D
the same as that of pure water
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6

Which of the following compounds is a base?

A
CO2
B
CaO
C
H3PO3
D
CH3COOCH3
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7

20 cm3 of a 2.0 M solution of ethanoic acid was added to excess of 0.05 M sodium hydroxide. The mass of the salt produced is?

(Na = 23, C = 12, O = 16, H = 1)

A
2.50 g
B
2.73 g
C
3.28 g
D
4.54 g
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8

What volume of oxygen measured at s.t.p would be liberated on electrolysis by 9650 coulombs of electricity?



(Molar volume of gas = 22.4 dm3, F = 96,500 C mol-)

A
22.4 dm3
B
11.2 dm3
C
1.12 dm3
D
0.560 dm3
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9

Crude copper could be purified by the electrolysis of concentrated copper (II) chloride if the crude copper is?

A
made both the anode and the cathode
B
made the cathode
C
made the anode
D
dissolved in the solution
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10

H- + H2(I)O → H2(g) + OH-(aq). From the equation above, it can be inferred that the?

A
reaction is a double decomposition
B
hydride ion is a reducing agent
C
hydride ion is an oxidizing agent
D
reaction is neutralization
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