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Chemistry
WAEC / WASSCE 1997
Organic Chemistry I: Hydrocarbons & Crude Oil
Ethene undergoes mainly addition reactions because it is
A
a gas
B
a hydrocarbon
C
unsaturated
D
easily polymerized
E
a covalent compound
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 #36567)
Chemistry
WAEC / WASSCE 1997
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The reaction between alkanoic acids and alkanols in the presence of a mineral acid is known as
A
saponification
B
hydrolysis
C
polymerization
D
esterification
E
dehydration
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 #36568)
Chemistry
WAEC / WASSCE 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Which of the following is the relative molecular mass of a compound which has empirical formula CH\(_2\)O? (H = 1; C = 12; O = 16)
A
42
B
45
C
126
D
180
E
145
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Empirical formula = CH\(_2\)O
= 12 + (2 x 1) + 16
= 30
Molecular formula = (CH\(_2\)O)\(_n\), where n is a whole number.
= 30n
\(\therefore\) From the options, only 180 is a multiple of 30. Hence, that is the only likely molecular mass with respect to CH\(_2\)O.
Source: Myschool Past Questions Archive (Record #36569)
Chemistry
WAEC / WASSCE 1997
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The by-product of the fermentation of sugar to ethanol is
A
propane -1,2,3-triol
B
ethyl ethanoate
C
ethanedioc acid
D
propanol
E
carbon (lV) oxide
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 #36570)
Chemistry
WAEC / WASSCE 1997
Organic Chemistry I: Hydrocarbons & Crude Oil
Alkanes react with the halogens mainly by
A
oxidation
B
polymerization
C
addition
D
reduction
E
substitution
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 #36571)
Chemistry
WAEC / WASSCE 1997
Organic Chemistry I: Hydrocarbons & Crude Oil
Which of the following is used widely in the manufacture of flavours and perfumes?
A
Alkanoates
B
Alkanones
C
Alkanes
D
Complex sugars
E
Aliphatic compounds
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 #36572)
Chemistry
WAEC / WASSCE 1997
Non-Metals & Their Compounds
The use of diamond in abrasives is due ti its
A
high melting point
B
durability
C
lustre
D
hardness
E
octahedral shape
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 #36573)
Chemistry
WAEC / WASSCE 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the substance lettered P to V in the equation below would be left on the filter paper if the reaction mixture were filtered? P (aq) + Q(aq) → V(s) + R(aq) + T(g)
A
P
B
Q
C
V
D
T
E
R
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 #36574)
Chemistry
WAEC / WASSCE 1997
Acids, Bases, pH & Salts
When chlorine is added to slaked lime, the product obtained is
A
bleaching powder
B
chlorinated water
C
hydrochloric acid
D
oxochlorate (l) acid
E
trioxochlorate (V) salt
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 #36575)
Chemistry
WAEC / WASSCE 1997
Nature of Matter & Separation Techniques
Which of the following when heated strongly in air will leave a metal as residue?
A
Sodium trioxonitrate (V)
B
Potassium trioxonitrate (V)
C
Silver trioxonitrate (V)
D
Lead (ll) trrioxonitrate(V)
E
Aluminium trioxonitrate (V)
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 #36576)
Chemistry
WAEC / WASSCE 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following is used as water softener?
A
Na2CO3.10H2O
B
CuSO4. 5H2O
C
MgSO4. 7H2O
D
CaCI2.2H2O
E
Na2SO4. 10H2O
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 #36577)
Chemistry
WAEC / WASSCE 1997
Stoichiometry, Mole Concept & Volumetric Analysis
The following oxides react with both acids and bases to form salts except
A
zinc oxide
B
lead (ll) oxide
C
aluminium oxide
D
tin (IV) oxide
E
carbon (Iv) oxide
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 #36578)
Chemistry
WAEC / WASSCE 1997
Electrolysis & Electrochemical Cells
Which of the following metals is not extracted by electrolysis ?
A
lron
B
Sodium
C
Calcium
D
Magnesium
E
Aluminium
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 #36579)
Chemistry
WAEC / WASSCE 1997
Metals, Transition Elements & Extraction
Which of the following is an ore of aluminium?
A
Haematite
B
Magnetite
C
Siderite
D
Bauxite
E
Cassiterite
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 #36580)
Chemistry
WAEC / WASSCE 1997
Metals, Transition Elements & Extraction
Lead and tin are the components of
A
steel
B
bronze
C
brass
D
dentist amalgam
E
soft solder
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 #36581)