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
correct option: c
Users' Answers & Comments2
Sodium chloride has no solubility product value because of its?
A
saline nature
B
high solubility
C
low solubility
D
insolubility
correct option: b
Users' Answers & Comments3
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).
(K = 39, O = 16, N =14).
A
0.10
B
0.20
C
1.00
D
2.00
correct option: d
Users' Answers & Comments4
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
correct option: c
Users' Answers & Comments5
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
correct option: c
Users' Answers & Comments6
Which of the following compounds is a base?
A
CO2
B
CaO
C
H3PO3
D
CH3COOCH3
correct option: b
Users' Answers & Comments7
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)
(Na = 23, C = 12, O = 16, H = 1)
A
2.50 g
B
2.73 g
C
3.28 g
D
4.54 g
correct option: c
Users' Answers & Comments8
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-)
(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
correct option: d
Users' Answers & Comments9
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
correct option: c
Users' Answers & Comments10
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
correct option: b
Users' Answers & Comments