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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
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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Reactions' Rates and Chemical Equilibria
Shapes of Molecules and Solids
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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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Stoichiometry
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 relationship between vapour density of gases and the relative molecular mass.
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Shapes of S and P orbitals
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Van der Waals' forces.
Shapes of simple molecules
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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
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Hydrolysis of salts
Oxidation and Reduction (REDOX) Reactions
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
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Electrochemical cells: Redox series
Half-cell reactions and electrode potentials
Calculations on electrolysis
Corrosion as an electrolytic process
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Properties of a system in equilibrium
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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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11
The products of the electrolysis of dilute sodium chlorid solution with platinum electrodes are
A.
hydrogen and oxygen
B.
oxygen and chlorine
C.
chlorine and water
D.
sodium amalgam and chlorine
E.
sodium hydroxide and water
View Answer & Discuss (3)
WAEC 1991
12
Which of the following modes of motion is exhibited by the particles of a solid?
A.
Vibrational and random motion
B.
Vibrational and translational motion
C.
Translational and random motion
D.
Vibrational motion only
E.
Translational motion only
View Answer & Discuss (9)
WAEC 1991
13
Which of the following statements is not correct? Group 7 elements
A.
are diatomic
B.
are good oxidizing agents
C.
are highly electronegative
D.
have relatively low ionization potentials
E.
have high electron affinity
View Answer & Discuss
WAEC 1991
14
In which of the following are the substances arranged in their correct order of increasing melting point?
A.
Sodium chloride, sulphur, diamond
B.
Diamond, sodium chloride, sulphur
C.
Sulphur, sodium chloride, diamond
D.
Diamond, sulphur, sodium chloride
E.
Sulphur, diamond, sodium chloride
View Answer & Discuss
WAEC 1991
15
A compound which liberates carbon (IV) oxide from a hydrogentrioxocarbonate (lV) could have the molecular formula
A.
C
2
H
5
OH
B.
C
3
H
4
C.
HCOOH
D.
H
2
O
2
E.
C
6
H
6
View Answer & Discuss (2)
WAEC 1991
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