1993 - WAEC Chemistry Past Questions and Answers - page 1
1
Copper metal will react with concentrated trioxonitrate (V) acid to give?
A
Cu(NO3)3 + NO + N2O4 + H2O
B
Cu(NO3)2 + NO + H2O
C
CuO + NO2 + H2O
D
Cu(NO2)3 + NO2 + H2O
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2
Which of the following separation is routinely applied in the petroleum industry
A
Filtration
B
Chromatography
C
Evaporation
D
Fractional crystallization
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3
Starch undergoes complete hydrolysis to produce
A
maltose
B
lactose
C
fructose
D
glucose
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4
Which of the following solids has a network structure?
A
Diamond
B
lodine
C
Sulphur
D
Graphite
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5
Trioxosulphate (lV) acid is not stored for a long period because it
A
is a weak dibasic acid
B
has bleaching properties
C
is unstable and eaily decomposed
D
smells strongly of sulphur (lV) oxide
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6
Alkanes are used mainly
A
in the production of plastics
B
as domestic and industrial fuels
C
in the textile industry
D
in the hydrogenation of oils
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7
Which of the following pairs illustrates isotopy?
A
But-l-ene and but -2-ene
B
Ortho-hydrogen and parahydrogen
C
Oxygen and ozone
D
Hydrogen and deuterium
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8
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
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9
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)
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10
Sulphur burns in air to form
A
an acidic oxide
B
a basic oxide
C
an amphoteric oxide
D
a neutra oxide
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