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Chemistry
WAEC / WASSCE 2008
Kinetics, Energetics and Equilibrium
Consider the equilibrium reaction represented by the equation: 2SO2(g) + O2(g) ⇌ 2SO3(g) ∆H = - 197 kJmol-1. At equilibrium, increase in the total pressure of the system brings about
A
decrease in rate of the reaction of the system
B
decrease in temperature of the system
C
increase in temperature of SO3
D
increase in concentration of SO2
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 #37292)
Chemistry
WAEC / WASSCE 2008
Matter & Separation Techniques
In dry Leclanche cell, manganese (IV) oxide acts as
A
a reducing agent
B
binding agent
C
catalyst
D
depolarizer
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 #37293)
Chemistry
WAEC / WASSCE 2008
Electrochemistry and Redox
Oxidation takes place at the anode during electrolysis because the anode
A
is deficient in electrons
B
is deficient in protons
C
has excess electrons
D
has attraction for positive ions
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 #37294)
Chemistry
WAEC / WASSCE 2008
Matter & Separation Techniques
Calculate the quantity of electricity passed when 0.4 A flows for 1 hour 20 minutes through an electrolytic cell
A
4800C
B
3840 C
C
1920 C
D
32 C
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 #37295)
Chemistry
WAEC / WASSCE 2008
Matter & Separation Techniques
A mixture of kerosene and diesel oil can be separated by
A
crystallization
B
distillation
C
precipitation
D
sublimation
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 #37296)
Chemistry
WAEC / WASSCE 2008
Atomic Structure and Periodic Table
Solution
Which of the following compounds would not give a precipitate with ammoniacal AgNO3 solution?
A
CH3 C≡CCH3
B
HC≡CH
C
CH3C≡CH
D
CH3CH2C≡CH
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Only terminal alkyne(simply, the alkyne in which the triple bonded carbon atoms are at the extreme positions.) reacts with ammonical AgNO3 and gives a white precipitate,
therefore, the correct option is A (Non-Terminal Alkyne has a triple bond at any place other than the end positions).
Source: Myschool Past Questions Archive (Record #37297)
Chemistry
WAEC / WASSCE 2008
Acids, Bases, and Salts
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
Matter & Separation Techniques
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
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
Matter & Separation Techniques
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
Acids, Bases, and Salts
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
Acids, Bases, and Salts
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
Matter & Separation Techniques
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
Acids, Bases, and Salts
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
Matter & Separation Techniques
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)