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611
Which of the following pollutants is biodegradable?
A.
Domestic sewage
B.
Metal scraps
C.
Radioactive waste
D.
Plastic foil
View Answer & Discuss
WAEC 2004
612
The process of seeding during the extraction of aluminium involves the addition of pure AI(OH)
3
crystals in order to
A.
lower the temperature
B.
increase the concentration
C.
facilitate the precipitation of solid
D.
reduce the viscosity of the solution
View Answer & Discuss (2)
WAEC 2004
613
Which of the following measures is not suitable for controlling water pollution?
A.
treating industrial effluent and domestic sewage before discharge into water
B.
Controlling the use of agrochemicals
C.
recycling industrial and agricultural wastes
D.
burning industrial and agricultural wastes before discharge into water ways
View Answer & Discuss
WAEC 2004
614
The electronic configuration of an element X is 1s
2
2s
2
2s
6
3p
2
3p
4
. It can be deduced that X
A.
Belongs to group 6 of the Periodic Table
B.
Belongs to group IV of the Periodic Table
C.
has 3 unpaired electrons in its atom
D.
has relative molecular mass of 16
View Answer & Discuss (5)
WAEC 2005
615
What is the mass number of an element having 20 neutrons, 15 protons and 15 electrons?
A.
15
B.
30
C.
35
D.
50
View Answer & Discuss (1)
WAEC 2005
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