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Chemistry
WAEC / WASSCE 2008
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
When ethanol is heated with excess concentrated tetraoxosulphate (VI) acid, the organic product formed is
A
ethanal
B
ethanoic acid
C
ethane
D
ethene
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 #37298)
Chemistry
WAEC / WASSCE 2008
Acids, Bases, pH & Salts
The hydrolysis of groundnut oil by potassium hydroxide is known as
A
hydrogenation
B
saponification
C
esteriffication
D
neutralization
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 #37299)
Chemistry
WAEC / WASSCE 2008
Organic Chemistry I: Hydrocarbons & Crude Oil
What is the main type of reaction alkenes undergo?
A
Addition
B
Condensation
C
Elimination
D
Substitutio
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 #37300)
Chemistry
WAEC / WASSCE 2008
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
Arrange the following compounds in order of increasing boiling point
l.CH\(_3\)CH\(_2\)CH\(_2\)OH
II.CH\(_3\)CH\(_2\)OH
III.CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)OH
IV.CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)CH\(_3\)
A
I < II < IV < III
B
IV < III < II < I
C
I < II < III < IV
D
IV < II < I< III
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
propanol
97^\circC
Ethanol
78^\circC
Butanol
118^\circC
Pentane
36.1^\circC
Hence, the arrangement is IV, II, I, III.
Source: Myschool Past Questions Archive (Record #37301)
Chemistry
WAEC / WASSCE 2008
Stoichiometry, Mole Concept & Volumetric Analysis
A solution of a salt was acidified with HCI when a few drops of BaCI2 solution were added, a white precipitate was formed. Which of the following anions is present in the salt?
A
CO2- 3
B
NO- 3
C
SO2- 4
D
SO2- 3
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 #37303)
Chemistry
WAEC / WASSCE 2008
Air & Environmental Chemistry
Which of the following substances causes the depletion of the ozone layer in the atmosphere?
A
Carbon (IV) oxide
B
Chlorofluorocarbon
C
Sulphur (IV) oxide
D
Hydrocarbons
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 #37304)
Chemistry
WAEC / WASSCE 2008
Stoichiometry, Mole Concept & Volumetric Analysis
Chemicals that are produced in small quantities and with very high degree of purity are
A
bulk chemicals
B
fine chemicals
C
heavy chemicals
D
light chemicals
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 #37305)
Chemistry
WAEC / WASSCE 2008
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Aluminium is a good roofing material because it
A
is strong and does not conduct heat and electricity
B
readily absorbs light
C
forms an oxide film over its surface which prevents corrosion
D
is flexible and can conduct heat
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The thin coat of aluminum oxide formed prevents further attack of the metal by atmospheric oxygen and water.
Source: Myschool Past Questions Archive (Record #37306)
Chemistry
WAEC / WASSCE 2008
Metals, Transition Elements & Extraction
Which of the following alloys is mainly used in making statues?
A
Brass
B
Bronze
C
Duralumin
D
Steel
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 #37307)
Chemistry
NECO SSCE 2008
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
The type of reaction ethyne mainly undergoes is
A
addition
B
carboxylation.
C
esterification
D
saponification
E
substitution
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The correct answer is A. Addition reaction
Ethyne (also known as acetylene) is an alkyne, a type of unsaturated hydrocarbon. Alkynes are characterized by their triple bond, which makes them highly reactive.
Ethyne mainly undergoes addition reactions, where molecules add to the triple bond. Examples of addition reactions involving ethyne include:
- Hydrogenation (addition of hydrogen)
- Halogenation (addition of halogens, such as chlorine or bromine)
- Hydration (addition of water)
The other options are not correct:
B. Carboxylation is a reaction that involves the addition of a carboxyl group (-COOH), which is not a typical reaction for ethyne.
C. Esterification is a reaction between an acid and an alcohol to form an ester, which is not relevant to ethyne.
D. Substitution reactions involve replacing one atom or group with another, which is not the primary type of reaction undergone by ethyne.
Source: Myschool Past Questions Archive (Record #43529)
Chemistry
NECO SSCE 2008
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m5Nm-2pressure becomes 300cm3 at 1.0 × 105Nm-2 pressure?
A
Avogadro’s
B
Boyle’s
C
Charles’
D
Faraday’s
E
Graham’s
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 #43530)
Chemistry
NECO SSCE 2008
Chemical Bonding & Intermolecular Forces
Solution
Chlorine atom forms Cl- by
A
donating lone pair of electrons
B
gaining an electron
C
losing an electron
D
sharing an electron
E
sharing a lone pair of electrons.
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Chlorine is a non-metal and non-metals ionize by gaining electron(s)
Source: Myschool Past Questions Archive (Record #43531)
Chemistry
NECO SSCE 2008
Stoichiometry, Mole Concept & Volumetric Analysis
The most efficient absorber of ultraviolet radiation in the atmosphere is
A
CO2
B
H2
C
H2O
D
02
E
O3
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 #43532)
Chemistry
NECO SSCE 2008
Water, Solutions & Solubility
When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as
A
Brownian movement.
B
Dialysis
C
Diffusion
D
Osmosis
E
Tyndall effect
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 #43533)
Chemistry
NECO SSCE 2008
Atomic Structure, Orbitals & Nuclear Chemistry
\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is
A
\( ^0_1e \)
B
\( ^0_{-1}e \)
C
\( ^4_2He \)
D
\( ^1_0n \)
E
\( ^1_1p\)
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 #43534)