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Chemistry
WAEC / WASSCE 2013
Electrochemistry and Redox
Consider the redox reaction as represented by the following equation: 12(aq) + 2S2O32-(aq) → 21-(aq) + S4O62-(aq). Which of the species in the equation is reduced?
A
S4O62-(aq)
B
S4O32-(aq)
C
12(aq)
D
1-(aq)
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 #37700)
Chemistry
WAEC / WASSCE 2013
Matter & Separation Techniques
The separation of petroleum fractions depends on the differences in their
A
melting points
B
molar masses
C
solubilities
D
boiling points
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 #37701)
Chemistry
WAEC / WASSCE 2013
Acids, Bases, and Salts
The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is
A
soap
B
sodium ethanoate
C
sodium methoxide
D
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 #37702)
Chemistry
WAEC / WASSCE 2013
Matter & Separation Techniques
Which of the following organic compounds would decolourize bromie water?
A
Benzene
B
Cyclobutane
C
Hexane
D
Pentane
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 #37703)
Chemistry
WAEC / WASSCE 2013
Stoichiometry & Mole Concept
Solution
How many isomers has C\(_3\)H\(_6\)CI\(_2\)?
A
2
B
3
C
4
D
5
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Isomers are two or more compounds having the same molecular formula but different structural formula or spatial representations.
The compound C\(_3\)H\(_6\)CI\(_2\) has four isomers. They include:
(a) 1,1 - dichloropropane
(b) 1,2 - dichloropropane
(c) 1,3 - dichloropropane
(d) 2, 2 - dichloropropane
See diagram above for better understanding.
Source: Myschool Past Questions Archive (Record #37704)
Chemistry
WAEC / WASSCE 2013
Organic Chemistry
Which of the following reactions is common to all hydrocarbones?
A
Combustion
B
Addition
C
Polymerization
D
Condensation
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 #37705)
Chemistry
WAEC / WASSCE 2013
Stoichiometry & Mole Concept
A hydrocarbon compound contains 92.3% carbon Determine its empirical formula [H = 1.00; C = 12.0]
A
CH
B
CH2-
C
CH3
D
C3H2
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 #37709)
Chemistry
WAEC / WASSCE 2013
Matter & Separation Techniques
The main function of limestone in the blast furnace is to
A
act as catalyst
B
act as reducing agent
C
remove impurity
D
supply carbon (IV) oxide
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 #37710)
Chemistry
WAEC / WASSCE 2013
Matter & Separation Techniques
Which of the following raw materials is used in a plastic industry?
A
Ethene
B
Methane
C
Calcium
D
Hydrogen
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 #37711)
Chemistry
WAEC / WASSCE 2013
Matter & Separation Techniques
Which of the following statements about fine chemical is correct? It
A
is injurious to health
B
has low degree of purity
C
is produced in relatively small amount
D
can be stored for a long time
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 #37712)
Chemistry
WAEC / WASSCE 2013
Matter & Separation Techniques
Which of the following materials is classified as a non-biodegradable pollutant?
A
Animal hide
B
Paper
C
Plastic
D
Wood
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 #37716)
Chemistry
WAEC / WASSCE 2013
Matter & Separation Techniques
Solution
Bronze is a mixture of
A
Cu and Mg
B
Cu and Sn
C
Cu and Zn
D
Cu and Pb
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Bronze is an alloy consisting primarily of copper, tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon.
Source: Myschool Past Questions Archive (Record #37718)
Chemistry
WAEC / WASSCE 2013
Matter & Separation Techniques
Which of the following statements about thermoplastic material is correct? They
A
do not melt on heating
B
harden on heating
C
decompose on heating
D
soften and melt on heating
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 #37719)
Chemistry
UTME / JAMB 2013
Atomic Structure and Periodic Table
How many unpaired electron are in the p-orbitals of a fluorine atom?
A
3
B
\( 0 \)
C
1
D
2
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 #44079)
Chemistry
UTME / JAMB 2013
Matter & Separation Techniques
The radioactive emission with the least ionization power is
A
\( \alpha - particles \)
B
X-rays
C
\( \gamma -rays \)
D
\( \beta - rays \)
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 #44081)