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246
What is the percentage by mass of copper in copper in copper (l) oxide (CU
2
O)? [O = 16; CU =64]
A.
88.9%
B.
80.0%
C.
66.7%
D.
20.0%
E.
11.1%
View Answer & Discuss (6)
WAEC 1995
247
A weak acid is one which
A.
is not corrosive
B.
is slightly ionized in water
C.
does not produce salts with alkalis
D.
does not conduct an electric current in aqueous solution
E.
forms acid salts with bases
View Answer & Discuss (2)
WAEC 1995
248
Which of the following species is always present in acidified water?
A.
NH
+
4
B.
O
2-
C.
HCI
D.
H
3
O
+
E.
HNO
3
View Answer & Discuss
WAEC 1995
249
The most suitable method for preparing lead (ll) chloride is by
A.
action of dilute HCI on PbSO
4
B.
acts of dilute HCI on lead
C.
action of dilute HCI on PbCO
3
D.
bubbling chlorine into a solution of Pb(NO
3
)
2
E.
mixing aqueous solutions Pb(NO
3
)
2
and NaCI.
View Answer & Discuss
WAEC 1995
250
A positive brown ring test indicates the presence of
A.
NO
3
B.
Fe
3+
C.
SO
2-
3
D.
CU
+
E.
NO
-
2
View Answer & Discuss (6)
WAEC 1995
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