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181
Carbon is often deposited in the exhaust-pipe of cars because of the?
A.
presence of carbon in petrol
B.
dehydrogenation of petrol
C.
incomplete combustion of petrol
D.
presence of additives in petrol
E.
contamination of petrol with diesel
View Answer & Discuss (6)
WAEC 1993
182
What does X atand for in the following expression? X = Log
(10)
(H
+
)
A.
Enthalpy change (∆H)
B.
Equilibrium constant (K)
C.
Solubility product
D.
Degree of acidity (pH)
E.
lonic product of water
View Answer & Discuss (1)
WAEC 1993
183
Sulphur burns in air to form
A.
an acidic oxide
B.
a basic oxide
C.
an amphoteric oxide
D.
a neutra oxide
E.
a mixed oxide
View Answer & Discuss
WAEC 1993
184
In which of the following changes is ∆S negative ?
A.
H
2
O
(l)
→ H
2
O
(s)
B.
C
(s)
+ 1/2O
2,/sub>
(g)
→ CO
(g)
C.
PCI
5
(g)
→ PCl
3
(g)
+ Cl
2
(g)
D.
NaCl
(s)
+ aq →Na
+
(aq)
+ Cl
-
(aq)
E.
NH
3
(g)
+ HCl
(g)
View Answer & Discuss (2)
WAEC 1993
185
Chlorine is is used in water treatment as
A.
a germicide
B.
a decolorizing agent
C.
an antioxidant
D.
a coagulating agent
E.
an aerating agent
View Answer & Discuss (1)
WAEC 1993
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