Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 23536–23550 of 29821 verified questions
Sort by:
Chemistry
WAEC / WASSCE 1993
Atomic Structure, Orbitals & Nuclear Chemistry
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
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 #36258)
Chemistry
WAEC / WASSCE 1993
Chemical Energetics & Thermochemistry
What does X atand for in the following expression? X = Log(10)(H+)
A
Enthalpy change (∆H)
B
Equilibrium constant (K)
C
Solubility product
D
Degree of acidity (pH)
E
lonic product of water
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 #36260)
Chemistry
WAEC / WASSCE 1993
Acids, Bases, pH & Salts
Sulphur burns in air to form
A
an acidic oxide
B
a basic oxide
C
an amphoteric oxide
D
a neutra oxide
E
a mixed oxide
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 #36261)
Chemistry
WAEC / WASSCE 1993
Stoichiometry, Mole Concept & Volumetric Analysis
In which of the following changes is ∆S negative ?
A
H2O(l) → H2O(s)
B
C(s) + 1/2O2,/sub>(g) → CO(g)
C
PCI5(g) → PCl3(g) + Cl2(g)
D
NaCl(s) + aq →Na+ (aq) + Cl- (aq)
E
NH3(g) + HCl(g)
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 #36262)
Chemistry
WAEC / WASSCE 1993
Water, Solutions & Solubility
Chlorine is is used in water treatment as
A
a germicide
B
a decolorizing agent
C
an antioxidant
D
a coagulating agent
E
an aerating agent
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 #36264)
Chemistry
WAEC / WASSCE 1993
Electrolysis & Electrochemical Cells
Which of the following pieces of deposited if a current of 10A was passed through a solution of copper(ll) salt for 965 seconds? (1F = 96500 C)
A
0.005 mole
B
0.025 mole
C
0.05 mole
D
1.00 mole
E
1.05 mole
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 #36266)
Chemistry
WAEC / WASSCE 1993
Metals, Transition Elements & Extraction
Some precious stones such as ruby and sapphire consist of aluminum oxide coloured by traces of the oxides of
A
group lV elements
B
group l metals
C
transition metals
D
alkaline earths
E
the halogens
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 #36267)
Chemistry
WAEC / WASSCE 1993
Reaction Rates & Chemical Equilibrium
Consider the reaction represented by the following equation CaCI2 (aq) + H 2C2O 4(aq) ⇌ CaC 2O4(s) + 2HCI(aq). Which of the following would dissolve the precipitate of CaC 2O4 formed?
A
Stirring the mixture vigorously
B
Adding more calcium chloride solution
C
lncreasing the concentration of the ethanedioic acid
D
Adding concentrated hydrochloric acid
E
Adding some distilled water
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 #36269)
Chemistry
WAEC / WASSCE 1993
Organic Chemistry I: Hydrocarbons & Crude Oil
The following gases decolorize bromine water except
A
C2H6
B
C2H4
C
C2H2
D
C3H4
E
C3H6
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 #36274)
Chemistry
WAEC / WASSCE 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
What volume of distilled water should be added to 400cm3 of 2.0 mole dm-3 \(H_{2}SO_{4}\) to obtain 0.20 mole dm-3 of solution>
A
600cm-3
B
800cm-3
C
1,000cm-3
D
3,600cm-3
E
4,000cm-3
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
\(400cm^{3} \to 2moldm^{-3}\)
\(0.4 dm^{3} \to 2moldm^{-3}\)
Multiplying in order to get the moles of the acid.
\(0.4dm^{3} \times 2moldm^{-3} = 0.8moles\)
After diluting to \(0.2moldm^{-3}\), the new volume will be
\(\frac{0.8}{0.2} = 4dm^{3}\)
Converting back to cm^3,
We have \(4 \times 1000cm^{3} = 4000cm^{3}\)
Hence, the volume of water added = \((4000 - 400)cm^{3} = 3600cm^{3}\)
Source: Myschool Past Questions Archive (Record #36278)
Chemistry
WAEC / WASSCE 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following indicates the correct increasing order of oxidizing power of the halogens?
A
F < CI < Br < l
B
l < Br < CI < F
C
I < CI < Br < F
D
Br < I < CI < F
E
CI < F < I < Br
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 #36282)
Chemistry
WAEC / WASSCE 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following substances is a peroxide?
A
Na2O2
B
CuO
C
PbO4
D
Fe2O
E
AI2O
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 #36285)
Chemistry
WAEC / WASSCE 1993
Air & Environmental Chemistry
The component of air that removed when air is bubbled into alkaline pyrogallol solution is
A
carbon(lV) oxide
B
oxgyen
C
water vapour
D
nitrogen
E
helium
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 #36306)
Chemistry
WAEC / WASSCE 1993
Water, Solutions & Solubility
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
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 #36307)
Chemistry
WAEC / WASSCE 1993
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Examples of polymers include the following except
A
starch
B
nylon
C
wool
D
perspex
E
glass
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #36308)