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Chemistry
WAEC / WASSCE 1992
Acids, Bases, pH & Salts
Which of the following processes is a physical reaction?
A
Electrolysis
B
Hydrolysis
C
Allotropic change
D
Neutralization
E
Corrosion
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #36180)
Chemistry
WAEC / WASSCE 1992
Stoichiometry, Mole Concept & Volumetric Analysis
The following acids are monobasic except
A
methanoic acid
B
dioxonitrate lll acid
C
ethanedioic acid
D
oxochlorate (l) acid
E
hydrobromic acid
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #36183)
Chemistry
WAEC / WASSCE 1992
Organic Chemistry I: Hydrocarbons & Crude Oil
The reactions ethyne are mainly
A
substitution reactions
B
addition reactions
C
addition polymerization
D
catalytic hydrogenation
E
catalytic halogenation
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #36184)
Chemistry
WAEC / WASSCE 1992
Periodic Table & Periodicity
When air is passed through potash and then pyrogallol, the components are noble gases,
A
oxygen and carbon (IV) oxide
B
oxygen and nitrogen
C
nitrogen and water vapour
D
water vapour and carbon (IV) oxide
E
oxygen and water vapour
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #36186)
Chemistry
WAEC / WASSCE 1992
Stoichiometry, Mole Concept & Volumetric Analysis
The halide used widely in photography is
A
ammonium chloride
B
calcum chloride
C
silver bromide
D
sodium brmide
E
aluminium fluroide
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #36188)
Chemistry
WAEC / WASSCE 1992
Water, Solutions & Solubility
The scum formed when soap is mixed with hard water could be
A
calcium trioxocarbonate (IV)
B
propane- 1, 2, 3 - triol
C
calcium hydrogentrioxocarbonate (IV)
D
magnesium tetraoxosulphate (IV)
E
calcium stearate
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #36195)
Chemistry
WAEC / WASSCE 1992
Electrolysis & Electrochemical Cells
Solution
What is the quantity of electricity produced when a current of 0.5A is passed for 5 hours 45 mins? (1F = 96500C)
A
0. 11F
B
0.12F
C
0.22F
D
1.1F
E
2.2F
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Given:
Current, I = 0.5 A , t = 5 hours 45 mins = (5 x 60 x 60) + (45 x 60) = 20,700 seconds ( Time must be converted to the standard unit which is second)
Also, recall that Q = It = 0.5 x 20,700 = 10,350C
Thus, if 1F = 96,500C
X = 10,350C
X = \(\frac{10,350}{96,500}\)
X = 0.107
X = 0.11F
Source: Myschool Past Questions Archive (Record #36196)
Chemistry
WAEC / WASSCE 1992
Reaction Rates & Chemical Equilibrium
''The rate a reaction is proportional to the number of effective collisions occurring per second between the reactants''. This statement is associated with the
A
Kinetic theory
B
rate law
C
atomic theory
D
collision theory
E
gas laws
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #36198)
Chemistry
WAEC / WASSCE 1992
Stoichiometry, Mole Concept & Volumetric Analysis
What is the following compounds will not decompose when heated strongly ?
A
NaHCO3
B
K2CO3
C
MgCO3
D
Ca(HCO3)2
E
ZnCO3
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #36216)
Chemistry
WAEC / WASSCE 1992
Atomic Structure, Orbitals & Nuclear Chemistry
What is the change in the oxidation number of phosphorus in the the reaction represented by the following equation? 4P (s) + 5O(2)(g) → 2P2O5(g)
A
0 to + 2
B
0 to 5
C
+4 to + 2
D
+4 to +5
E
+4 to +7
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #36217)
Chemistry
WAEC / WASSCE 1992
Oxidation, Reduction & Redox Reactions
When iron rusts, it undergoes
A
deliquescence
B
chemical decomposition
C
hydrolysis
D
redox reaction
E
combustion
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #36218)
Chemistry
WAEC / WASSCE 1992
Stoichiometry, Mole Concept & Volumetric Analysis
Consider the compounds represented by the following general formula: X2SO4 Y2(SO4)3, 24H2OX and Y could respectively be
A
K and AI
B
Fe and K
C
AI and Fe
D
AI and K
E
Cr and K
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #36219)
Chemistry
WAEC / WASSCE 1992
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which of the following involves the decomposition enzymic action?
A
Esterification
B
Fermentation
C
Dehydration
D
Polymerization
E
Saponification
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #36220)
Chemistry
WAEC / WASSCE 1992
Stoichiometry, Mole Concept & Volumetric Analysis
The following salts are readily soluble in water except
A
Na2CO3
B
Pb(NO3)2
C
KCI
D
CuCO3
E
PbSO4
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #36221)
Chemistry
WAEC / WASSCE 1992
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
When sucrose is warmed with Fehling's solution
A
a silver mirror is produced
B
the solution turns milky
C
a brick-red precipitate is formed
D
there is no precipitate
E
a blue coloration is produced
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #36222)