1995 - JAMB Chemistry Past Questions and Answers - page 2
11
Which of the following statements is FALSE about isotopes of the same element?
A
They have the same number of electrons in their outermost shells
B
They have different atomic masses
C
They have the same atomic number and the number of electrons
D
They have the same atomic number but different umber of elelctrons
correct option: d
Users' Answers & Comments12
Helium is often used in observation balloons because it is?
A
light and combustible
B
light and non-combustible
C
heavy and combustible
D
heavy and non-combustible
correct option: b
Users' Answers & Comments13
Deliquescent substances are also?
A
efflorescent
B
anhydrous
C
hygroscopic
D
insoluble
correct option: c
Users' Answers & Comments14
When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain?
A
ethane
B
chlorine
C
hydrogen chloride
D
ethene
correct option: c
Users' Answers & Comments15
The difference between colloides and and suspensions is brought out clearly by the fact that while colloids?
A
do not scatter light, suspensions do
B
can be separated by filtration, suspension cannot be so separated
C
can be separated by a membrane, suspensions cannot
D
do not settle out on standing, suspensions do
correct option: d
Users' Answers & Comments16
In general, an increase in temperature increases the solubility of a solute in water because?
A
more solute molecules collide with each other
B
most solutes dissolve with the evoltion of heat
C
more solute molecules dissociate at hihger temperatures
D
most solutes dissolve with absorption of heat
correct option: c
Users' Answers & Comments17
Neutralization involves a reaction between H3O+ and?
A
CI-
B
OH-
C
NO3-
D
CO32-
correct option: b
Users' Answers & Comments18
In the process of silver-plating a metal M, the metal M is the?
A
anode and a driect current is used
B
cathode and an alternating current is used
C
anode and an alternating current is used
D
cathode and a direct current is used
correct option: b
Users' Answers & Comments19
How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)?
(F = 96 500 C mol-)
(F = 96 500 C mol-)
A
0.5
B
1.0
C
1.5
D
3.0
correct option: c
Users' Answers & Comments20
2CL-(aq) → CI2(g) + 2e-(aq). The above half-cell reaction occuring at the anode during the electrolysis of dilute ZnCI2 solution is?
A
ionization
B
oxidation
C
reduction
D
recombination
correct option: b
Users' Answers & Comments