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Chemistry WAEC Past Questions
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Matter and Separation Techniques
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BASIC CHEMISTRY
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Periodic Table
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Water and Solubility Concept
Mass-Volume Concepts
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INORGANIC CHEMISTRY
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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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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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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
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Change of States of matter
Phenomena Supporting Kinetic theory-Diffusion and Osmosis
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The relationship between vapour density of gases and the relative molecular mass.
Atomic Structure and Bonding
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Shapes of S and P orbitals
The Periodic table and periodicity of elements
The variation of the following properties: ionization energy, ionic radii, electron affinity and electronegativity
Chemical bonding
Van der Waals' forces.
Shapes of simple molecules
Nuclear Chemistry
Radioactivity - Types and properties of radiations
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Air as a mixture and some uses of the noble gas
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Water as a product of the combustion of hydrogen and its composition by volume
Water as a solvent
Hardness of water
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Water of crystallization, efflorescence, deliquescence and hygroscopy
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Unsaturated, saturated and supersaturated solutions
Definition of Solubility and Solubility curves and simple deductions
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pH and pOH scale; Simple calculations
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Hydrolysis of salts
Oxidation and Reduction (REDOX) Reactions
Oxidation in terms of the addition of oxygen or removal of hydrogen.
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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
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Electrochemical cells: Redox series
Half-cell reactions and electrode potentials
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Entropy as an order-disorder phenomenon
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Arrhenius’ law and Collision theory
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Definition of the following terminologies: systems, reactions and dynamic equilibrium.
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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176
Starch undergoes complete hydrolysis to produce
A.
maltose
B.
lactose
C.
fructose
D.
glucose
E.
sucrose
View Answer & Discuss
WAEC 1993
177
Which of the following solids has a network structure?
A.
Diamond
B.
lodine
C.
Sulphur
D.
Graphite
E.
lron
View Answer & Discuss (6)
WAEC 1993
178
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
E.
can act as a germicide
View Answer & Discuss
WAEC 1993
179
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
E.
as fine chemicals
View Answer & Discuss (1)
WAEC 1993
180
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
E.
Alpha-particle and beta-particle
View Answer & Discuss (5)
WAEC 1993
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