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
Ask EduPadi AI for a detailed answer
Share this question
12
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
Ask EduPadi AI for a detailed answer
Share this question
13
Deliquescent substances are also?
A
efflorescent
B
anhydrous
C
hygroscopic
D
insoluble
Ask EduPadi AI for a detailed answer
Share this question
14
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
Ask EduPadi AI for a detailed answer
Share this question
15
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
Ask EduPadi AI for a detailed answer
Share this question
16
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
Ask EduPadi AI for a detailed answer
Share this question
17
Neutralization involves a reaction between H3O+ and?
A
CI-
B
OH-
C
NO3-
D
CO32-
Ask EduPadi AI for a detailed answer
Share this question
18
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
Ask EduPadi AI for a detailed answer
Share this question
19
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
Ask EduPadi AI for a detailed answer
Share this question
20
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
Ask EduPadi AI for a detailed answer
Share this question