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Home
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Chemistry
WAEC 1991
Chemistry 1991 WAEC Past Questions
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Matter and Separation Techniques
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BASIC CHEMISTRY
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Carbon - Carbon Compounds
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Halogen Family
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Metals and their Compounds 1
Transition Metals and their Compounds
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Basic Concepts of Organic Chemistry
Organic Chemistry 2
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Gay Lussac's law of combining volumes
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chemical symbols, formulae, equations and their uses
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The mole concept and Avogadro's number
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IUPAC nomenclature of inorganic compounds using oxidation number
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Non-metals and their compounds
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General properties of metals
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Aluminium and its compound
Tin Extraction from its ores
Metals of the first transition series
Iron Extraction from sulphide and oxide ores
Copper Extraction from sulphide and oxide ores
Alloy
Organic Compounds
Introduction to the tetravalency of carbon
Alkanes: Homologous series in relation to physical properties
Alkenes: Isomerism (structural and geometric isomerism)
Alkynes: Ethyne
Aromatic hydrocarbons e.g. benzene - structure, properties and uses
Alkanols: Primary, secondary, tertiary
Alkanals and alkanones
Alkanoic acids
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Amines (Alkanamines): Primary, Secondary, and tertiary
Carbohydrates
Proteins: Primary structures, hydrolysis and tests
Enzymes and their functions
Polymers: Natural and synthetic rubber
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Chemical industries: Types, raw materials and relevances
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21
In the redox reaction represented by the following equation: Cu
2+
aq
+ Zn
(s)
→ Cu
(s)
+ Zn
2+
A.
the oxidation number of copper increases
B.
copper (ll) ions are reduced to copper atoms
C.
zinc atoms are reduced to zinc ions
D.
copper (ll) ions donate electrons to zinc atoms
View Answer & Discuss (2)
WAEC 1991
22
When starch undergoes complete enzyme-catalyzed hydrolysis, the resulting product is
A.
glucose
B.
maltose
C.
sucrose
D.
fructose
E.
cellulose
View Answer & Discuss (2)
WAEC 1991
23
Which of the reactions represented by the following equations will take place at room temperature?
A.
C 6 H
2
O → CO + H
2
B.
CuO + H
2
→ Cu + H
2
O
C.
N
2
+ 3H
2
→ 2NH
3
D.
2Na + 2H
2
O → 2NaOH + H
2
E.
2Fe + 3CI
2
→ 2FeCI
3
View Answer & Discuss (4)
WAEC 1991
24
Which of the following is not a direct petroleum product?
A.
Methane
B.
Ethanol
C.
Petrol
D.
Vaseline
E.
Kerosene
View Answer & Discuss (10)
WAEC 1991
25
How many principal electronic shells has an atom whose electronic configuration is shown below? 1s
2
2s
2
2p
6
3s
1
A.
1
B.
2
C.
3
D.
4
E.
11
View Answer & Discuss (3)
WAEC 1991
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