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Chemistry UTME / JAMB 1990 Acids, Bases, pH & Salts
The above reaction is an example of
Attached Figure / Diagram
Question diagram
A
a displacement reaction
B
a neutralization reaction
C
an elimination reaction
D
saponification
medium Difficulty
Chemistry UTME / JAMB 1990 Organic Chemistry I: Hydrocarbons & Crude Oil
Select the right answer from the structure above.Which of the following compounds represents the polymerization product of ethyne?
Attached Figure / Diagram
Question diagram
A
A
B
B
C
C
D
D
medium Difficulty
Chemistry WAEC / WASSCE 1990 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Catalytic hydrogenation of oils results in the production of
A
soaps
B
detergents
C
alkanes
D
butter
E
margarine
medium Difficulty
Chemistry WAEC / WASSCE 1990 Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following reaction will not take place under normal conditions?
A
Zn(s) + 2HCl → ZnCI2(aq) + H 2(g)
B
Fe (s) + H 2SO4(aq) → FeSO4(aq) + H2(g)
C
Cu (s) + 2HCI (aq) → CuCI 2(aq) + H2(g)
D
Ca(s) + 2H 2O (1) → Ca(OH)2(g) + H2(g)
E
2Na(s) + 2H 2O (1) → 2NaOH(aq) + H2(g)
medium Difficulty
Chemistry WAEC / WASSCE 1990 Nature of Matter & Separation Techniques
A sample of orange juice is suspected to have been contaminated with a yellow dye. Which of the following methods can be used to detect the dye?
A
Decantation
B
Chromatography
C
Distillation
D
Filtration
E
Evaporation
medium Difficulty
Chemistry WAEC / WASSCE 1990 Atomic Structure, Orbitals & Nuclear Chemistry
The electronic configuration 1s2 22s 22p 63s23p 6 is that of a
A
noble gas
B
Group ll element
C
Group lll element
D
Group V element
E
Group VI element
medium Difficulty
Chemistry WAEC / WASSCE 1990 Nature of Matter & Separation Techniques
The heat accompanying the reaction represented by the equation H2O (l) → H 2O(g) is described as the heat of
A
solution
B
neutralization
C
vaporization
D
sublimation
E
activation
medium Difficulty
Chemistry WAEC / WASSCE 1990 Electrolysis & Electrochemical Cells
Aluminum is above iron in the electrochemical series, yet iron corrodes easily on exposure to air while aluminium does not. This is because aluminium
A
has a lower density than iron
B
is a better conductor than iron
C
does not corrode spontaneously
D
forms thin layer of inert oxide in moist air
E
forms amphoteric oxides while iron does not
medium Difficulty
Chemistry WAEC / WASSCE 1990 Stoichiometry, Mole Concept & Volumetric Analysis
When a solid melts and consequently boils, there is
A
a gradual increase in the average kinetic energy of the particles
B
a sudden decrease in the kinetic energy of the particles
C
no change in the average kinetic energy of the particles
D
a rapid change in the nature of bonding of the components
E
a change in the size of the fundamental particles
medium Difficulty
Chemistry WAEC / WASSCE 1990 Organic Chemistry I: Hydrocarbons & Crude Oil
Which of the following compounds will undergo additional reactions?
A
Ethyne
B
Butane
C
Pentane
D
Tetrachloromethane
E
Ethanol
medium Difficulty
Chemistry WAEC / WASSCE 1990 Metals, Transition Elements & Extraction
Which of the following reactions does not occur in the blast furnace during the extraction of iron?
A
Fe2O3 (s) + 3CO(g) → 2Fe(l) + 3CO2(g)
B
C2 + CO 2(g)
C
CaO(s) + SiO2(s) → CaSiO 3(s)
D
FeO(s) + CO2(g) + Fe(l)
E
2Fe2O(s) → 4Fe(l) 3O2(g)
medium Difficulty
Chemistry WAEC / WASSCE 1990 Reaction Rates & Chemical Equilibrium
A catayst which increases the rate of a chemical reaction does so by
A
increasing the reaction pathway
B
increasing the surface area of the reactants
C
increasing the pressure on the system
D
decreasing the temperature at which the reaction occurs
E
decreasing the activation energy of the reaction
medium Difficulty
Chemistry WAEC / WASSCE 1990 Stoichiometry, Mole Concept & Volumetric Analysis
How many molecules are there in 14g of nitrogen gas at s.t.p? (n = 14, Avogadro Number = 6. 0 x \(10^{23 }\)mol-1)
A
1.2 x 10 23
B
3.0 x 1023
C
6.0 x1023
D
1.2 x 1024
E
30 x1023
medium Difficulty
Chemistry WAEC / WASSCE 1990 Chemical Energetics & Thermochemistry
Which of the following correctly explains entropy?
A
the natural tendency for a system to achieve a greater disorder
B
a balance of two driving forces between free energy and enthalpy changes
C
the cause of spontaneity of a reaction
D
a measure of the enthalpy of a reaction
E
a measure of the rate of attaining equilibrum in a reversible reaction
medium Difficulty
Chemistry WAEC / WASSCE 1990 Stoichiometry, Mole Concept & Volumetric Analysis
The gas that is liberated when iron is heated with concentrated tetraoxosulphate (VI)acid is
A
H2S
B
\(SO_{2}\)
C
HCI
D
SO3
E
O2
medium Difficulty
Page 1697 of 1989