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371
Two metallic ions commonly present in hard water are
A.
Ca
2+
and Zn
2+
B.
Cu
2+
and Na
+
C.
Mg
2+
and Ca
2+
D.
Fe
2+
and Na
+
E.
Zn
2+
and Cu
2+
View Answer & Discuss
WAEC 1998
372
Rusting of iron is an example of
A.
deliquescence
B.
decomposition
C.
displacement reaction
D.
redox reaction
E.
reversible reaction
View Answer & Discuss
WAEC 1998
373
Aluminium is extracted from
A.
magnetite
B.
cryolite
C.
bauxite
D.
cassiterite
View Answer & Discuss
WAEC 1998
374
Metals are said to be malleable because they
A.
are good conductors heat
B.
are good conductors of electricity
C.
can be beaten into sheets
D.
can be alloyed
E.
can be polished
View Answer & Discuss
WAEC 1998
375
A device used in the laboratory for intermittent production of gases without heating is
A.
Leibing condenser
B.
aspirator
C.
delivery tube
D.
inverted funnel
E.
Kipp's apparatus
View Answer & Discuss (2)
WAEC 1998
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