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Chemistry
WAEC / WASSCE 1996
Chemical Energetics & Thermochemistry
What does X represent in the following equation? H 2(g) + 1/2O2(g) → H2O (l); ∆H = xKJ.
A
Bond energy
B
Activation energy
C
Ionization energy
D
Enthalpy of neutralization
E
Enthalpy of formation
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 #36484)
Chemistry
WAEC / WASSCE 1996
Organic Chemistry I: Hydrocarbons & Crude Oil
If the third member of a homologous series is C3H8, the fifth member will be
A
C 5H8
B
C5H9
C
C5H10
D
C5H11
E
C5H12
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 #36489)
Chemistry
WAEC / WASSCE 1996
Organic Chemistry I: Hydrocarbons & Crude Oil
Which of the following exhibits resonance?
A
Benzene
B
Butane
C
Pentene
D
Octana
E
Hexene
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 #36490)
Chemistry
WAEC / WASSCE 1996
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
On exposing palm wine to air for some days, it becomes sour owing to the conversion of
A
glucose to ethanol
B
glucose to gluconic acid
C
ethanol to ethanoic acid
D
ethanol to ethanal
E
palm wine to palmitic 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 #36492)
Chemistry
WAEC / WASSCE 1996
Oxidation, Reduction & Redox Reactions
When acidified KMnO4 solution is decolorised by ethene, the gas acts as
A
a straight-chain hydrocarbon
B
a saturated hydrocarbon
C
a reducing agent
D
a dehydrating agent
E
an oxidizing agent
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 #36493)
Chemistry
WAEC / WASSCE 1996
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
What amount of hydrogen will be required for complete hydrogenation of one mole of pent-3-yne?
A
1 mole
B
2 moles
C
3 moles
D
5 moles
E
6 moles
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
During complete hydrogenation, the unsaturated alkyne is converted into a fully saturated alkane (pentane). This process requires breaking both \(\pi \) bonds and adding hydrogen atoms across them. Each mole of pi bonds reacts with exactly one mole of diatomic hydrogen gas (H\(_2\)).
A carbon-carbon triple bond consists of one strong sigma bond and two weaker pi bonds.
The general chemical equation for this addition reaction is:
The general chemical equation for this addition reaction is:
CH\(_3\)CH\(_2\)C≡CCH\(_3\) + 3H\(_2\) → CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)CH\(_3\)
Exactly 2 moles of hydrogen gas are required for the complete hydrogenation of one mole of pent-3-yne to form pentane.
Source: Myschool Past Questions Archive (Record #36494)
Chemistry
WAEC / WASSCE 1996
Organic Chemistry I: Hydrocarbons & Crude Oil
When excess carbon (lV) oxide is passed into lime water, the turbidity produced initially disappears due to the formation of
A
calcium oxide
B
calcium carbide
C
calcium hydrogentrioxocarbonate (IV)
D
trioxocarbonate (IV) acid
E
calcium trioxocarbonate (IV)
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 #36495)
Chemistry
WAEC / WASSCE 1996
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which of the following is a disaccharide?
A
fructose
B
starch
C
cellulose
D
sucrose
E
glycogen
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 #36496)
Chemistry
WAEC / WASSCE 1996
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. Compound X was probably
A
rubber
B
polyethene
C
nylon
D
cellulose
E
ethanol
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 #36497)
Chemistry
WAEC / WASSCE 1996
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. What type of reaction was involved between compound X and concentrated hydrochloric acid?
A
Polymerization
B
Fermentation
C
Hydrolysis
D
Neutralization
E
Esterification
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 #36498)
Chemistry
WAEC / WASSCE 1996
Air & Environmental Chemistry
The component of air that can be removed by alkaline pyrogallol solution is
A
oxygen
B
nitrogen
C
water vapour
D
carbon (IV) oxide
E
noble gases
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 #36499)
Chemistry
WAEC / WASSCE 1996
Water, Solutions & Solubility
During water treatment for town supply, water is passed through layers of send beds in order to
A
soften the water
B
filter the water
C
decolorize the water
D
destroy the germs in the water
E
coagulate colloidal particles in the water
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 #36500)
Chemistry
WAEC / WASSCE 1996
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The cleansing action of soap in hard water is not satisfactory because soap
A
forms insoluble calcium and magnesium salts
B
is made from fats and oils
C
has an organic component
D
alters the surface tension of water
E
is a sodium salt of higher carboxylic acids
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 #36501)
Chemistry
WAEC / WASSCE 1996
Acids, Bases, pH & Salts
What is the role of MnO2 in the reaction represented by the following equation?MnO2 + 4HCI2 + CI2 + 2H2O
A
Bleaching agent
B
Oxidizing agent
C
Amphoteric oxide
D
Basic oxide
E
Catalyst
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 #36509)
Chemistry
WAEC / WASSCE 1996
Non-Metals & Their Compounds
Nitrogen is prepared on a large scale by the
A
fractional distillation of liquefied air
B
decomposition of ammonium dioxonitrate (lll)
C
electrolysis of brine
D
Haber process
E
Contact process
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 #36510)