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711
from the following ores is iron extracted? I. Haematite ll. Bauxite III. Magnetite IV. Cassiterite
A.
l and ll only
B.
l and lll only
C.
l, ll and lll only
D.
l, ll, lll and lV
View Answer & Discuss (1)
WAEC 2007
712
Which of the following methods can be used to separate a mixture of two miscible liquids with different boiling points?
A.
Decantation
B.
Distillation
C.
Evaporation
D.
Filtration
View Answer & Discuss (4)
WAEC 2007
713
The following substances are heavy chemicals except
A.
sodium trioxocarbonate (IV)
B.
tetraoxosulphate (VI) acid
C.
lead (lV) tetraethyl
D.
sodium hydroxide
View Answer & Discuss (1)
WAEC 2007
714
Pig-iron is brittle because it contains
A.
a high percentage of carbon as impurity
B.
calcium trioxosilicate (IV)
C.
unreacted haematite
D.
undecomposed limestone
View Answer & Discuss
WAEC 2007
715
What volume will 0.5 g of H
2
occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm
3
at s.t.p.]
A.
2.24 dm
3
B.
5.60dm
3
C.
11.20dm
3
D.
44.80dm
3
View Answer & Discuss (3)
WAEC 2007
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