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Home
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Chemistry
WAEC 1993
Chemistry 1993 WAEC Past Questions
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Matter and Separation Techniques
Particulate Nature of Matter
BASIC CHEMISTRY
Chemical Combinations
Properties of Gases ( Gas Laws )
Properties of Solids and Liquids
Acids, Bases and Salts
Periodic Table
Air and Air Pollution
Water and Solubility Concept
Mass-Volume Concepts
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INORGANIC CHEMISTRY
Hydrogen ( Hydrides )
Oxygen ( Oxides - Ozone )
Carbon - Carbon Compounds
Nitrogen - Nitrogen Compounds
Phosphorus - Phosphorus Compounds
Sulphur - Sulphur Compounds
Halogen Family
Silicon and its Compounds
Metals and their Compounds 1
Transition Metals and their Compounds
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Hydrocarbons
Crude Oil
Basic Concepts of Organic Chemistry
Organic Chemistry 2
Applied Chemistry
Chemical Industry
The Solar System
Separation of mixtures and purification of chemical substance
Definition and classification of matter
Elements, compounds and mixtures
Physical and chemical changes
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Laws of definite and multiple proportions
Law of conservation of matter
Gay Lussac's law of combining volumes
Avogadro's law
chemical symbols, formulae, equations and their uses
Relative atomic mass based on 12C-12
The mole concept and Avogadro's number
Kinetic Theory of Matter and Gas Laws
States of matter
Change of States of matter
Phenomena Supporting Kinetic theory-Diffusion and Osmosis
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The ideal gas equation (PV = nRT)
The relationship between vapour density of gases and the relative molecular mass.
Atomic Structure and Bonding
The concept of atoms, molecules and ions, the works of Dalton, Millikan, Rutherford, Moseley, Thompson and Bohr
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Shapes of S and P orbitals
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Chemical bonding
Van der Waals' forces.
Shapes of simple molecules
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Radioactivity - Types and properties of radiations
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The natural gaseous constituents and their proportion in the air
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Water of crystallization, efflorescence, deliquescence and hygroscopy
Solubility
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Acid/base titrations.
Hydrolysis of salts
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Oxidation in terms of the addition of oxygen or removal of hydrogen.
Reduction as removal of oxygen or addition of hydrogen.
Oxidation and reduction in terms of electron transfer
Use of oxidation numbers in defining REDOX reactions and balancing simple equations.
IUPAC nomenclature of inorganic compounds using oxidation number
Tests for oxidizing and reducing agents
Electrolysis
Electrolytes and non-electrolytes, and Faraday's laws of electrolysis
Electrolysis of dilute H2SO4, aqueous CuSO4, CuCl2 solution, dilute and concentrated NaCl solutions and fused NaCl
Factors affecting discharge of ions at the electrodes
Uses of electrolysis
Electrochemical cells: Redox series
Half-cell reactions and electrode potentials
Calculations on electrolysis
Corrosion as an electrolytic process
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Energy changes accompanying physical and chemical changes
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Entropy as an order-disorder phenomenon
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Properties of a system in equilibrium
Factors governing the equilibrium position
Le Chatelier’s principle
Equilibrium constant
Non-metals and their compounds
Hydrogen and Hydrides
Halogens: Chlorine as a representative element of the halogen
Oxygen and Oxides
Sulphur and its compound
Nitrogen and its compounds
Carbon: Allotropes, Uses and properties.
Metals and their compounds
General properties of metals
Alkali metals e.g. sodium
Alkaline-earth metals
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
Alkanoates
Amines (Alkanamines): Primary, Secondary, and tertiary
Carbohydrates
Proteins: Primary structures, hydrolysis and tests
Enzymes and their functions
Polymers: Natural and synthetic rubber
Industrial Chemistry
Chemical industries: Types, raw materials and relevances
Economics of Industrial process
Importance of industrial chemistry in Nigeria
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21
Which of the following will not affect the degree of hardness in a sample of temporarily hard water?
A.
Addition of washing soda
B.
Adding of soap
C.
Treatment with carbon exchange resin
D.
Filtration
E.
Distillation
View Answer & Discuss
WAEC 1993
22
Examples of polymers include the following except
A.
starch
B.
nylon
C.
wool
D.
perspex
E.
glass
View Answer & Discuss
WAEC 1993
23
When the trioxonitrate (IV) salt of an alkali metal Y is heated, the formula of the residue is
A.
Y
2
O
B.
YNO
2
C.
Y
2
O
3
D.
Y (NO
2
)
2
E.
YO
2
View Answer & Discuss (1)
WAEC 1993
24
Which of the following compounds of tin is a strong reducing agent?
A.
SnCI
2
B.
SnCI
4
C.
SnO
2
D.
SnH
4
E.
Sn(OH)
2
View Answer & Discuss (3)
WAEC 1993
25
In which of the following pairs are both substances deliquescent?
A.
CaCI
2
and H
2
SO
4
B.
NaOH and MgSO
4
7H
2
O
C.
CaCI
2
and NaOH
D.
CUO and NaCI
E.
CaCO
3
and MgCI
2
View Answer & Discuss
WAEC 1993
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