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566
What volume of 0.20 mol dm
-3
NaOH solution would yield 5.0 g of NaOH on evaporation to dryness? [NaOH = 40g mol
-1
]
A.
400 cm
3
B.
625 cm
3
C.
1000 cm
3
D.
1600 cm
3
View Answer & Discuss
WAEC 2003
567
Which of the following compound is used for removing impurities from bauxite?
A.
NaOH
B.
CaCO
3
C.
Na
3
AIF
6
D.
H
2
SO
4
View Answer & Discuss
WAEC 2003
568
What is the main impurity in haematite?
A.
CaSiO
3
B.
CaCO
3
C.
SiO
3
D.
Fe
2
O
3
View Answer & Discuss (3)
WAEC 2003
569
When a sample of water was boiled, it lathered more readily with soap. it can be concluded that the sample most likely contained
A.
magnesium tetraoxosulphate (VI)
B.
suspended solids
C.
Organic impurities
D.
calcium hydrogentrioxocarbonate (IV)
View Answer & Discuss (1)
WAEC 2003
570
What are the two gases associated with the formation of acid rain?
A.
CO
2
and HCI
B.
CO
2
and N
2
C.
CO
2
and NO
2
D.
HCI ans SO
2
View Answer & Discuss (3)
WAEC 2003
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