1995 - JAMB Chemistry Past Questions and Answers - page 1
1
Chromatography is used to separate components of mixtures which differ in their rates of?
A
diffusion
B
migration
C
reaction
D
sedimentaion
correct option: b
Users' Answers & Comments2
Which of the following is a example of a chemical change?
A
Dissoultion of salt in water
B
Rusting of iron
C
Melting of ice
D
Separating a mixture by distillation
correct option: b
Users' Answers & Comments3
The number of hydrogen ions in 4.9 g of tetraoxosulphate (IV) acid is?
(S = 32, O =16, H = 1, Na = 6.02 x 1023
(S = 32, O =16, H = 1, Na = 6.02 x 1023
A
3.01 x 1022
B
6.02 x 1022
C
3.01 x 1023
D
6.01 x 1023
correct option: b
Users' Answers & Comments4
What volume of oxygen will remain after reacting 8cm3 of hydrogen with 20cm3 of oxygen?
A
10 cm3
B
12 cm3
C
14 cm3
D
16 cm3
correct option: d
Users' Answers & Comments5
A gas sample with an initial volume of 3.25 dm3 is heated and allowed to expand to 9.75 dm3 at constant pressure. What is the ratio of the final absolute temperature to the initial absolute temperature?
A
3:1
B
5:2
C
5:4
D
8:3
correct option: a
Users' Answers & Comments6
Two cylinders A and B each contains 30 cm3 of
oxygen and nitrogen respectively at the same temperature and pressure. If there are 5.0 moles of nitrogen, then the mass of oxygen is?
oxygen and nitrogen respectively at the same temperature and pressure. If there are 5.0 moles of nitrogen, then the mass of oxygen is?
A
3.2 g
B
6.4 g
C
80.0 g
D
160.0 g
correct option: d
Users' Answers & Comments7
A liquid begins to boil when?
A
its vapour pressure is equal to the vapour pressure of its solid at the given temperature
B
molecules start escaping from its surface
C
its vapour pressure equals the atmosphere pressure
D
its volume is sightly increased
correct option: c
Users' Answers & Comments8
A particle that contains 8 proton, 9 neutrons and 7 electrons could be written as?
A
O
B
O+
C
O+
D
O-
correct option: b
Users' Answers & Comments9
In the oil drop experiment, Millikan determined the?
A
charge to mass ratio of the electron
B
mass of the electron
C
charge of the electron
D
mass of the proton
correct option: c
Users' Answers & Comments10
The ability of ionic solids is generally due to the?
A
negative electron affinity of most atoms
B
crystal lattice forces
C
electron pair sharing
D
positive ionization potentials
correct option: b
Users' Answers & Comments