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Chemistry
WAEC / WASSCE 2009
Electrolysis & Electrochemical Cells
Solution
Which of the following substances is the anode in the dry Leclanche cell ?
A
Carbon rod
B
Muslin bag
C
The seal
D
Zinc container
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
In a Leclanche cell, the anode is a zinc rod / container and the cathode is a carbon rod with ammonium chloride solution / paste as the electrolyte.
Source: Myschool Past Questions Archive (Record #37399)
Chemistry
WAEC / WASSCE 2009
Oxidation, Reduction & Redox Reactions
Consider the reaction represented by the equation: 2H2SO 4(aq0 + C(s) → 2H2O(l) + 2SO2(g) + CO 2(g) H2SO 4 is acting as
A
a catalyst
B
an oxidizing agent
C
a reducing agent
D
a sulphonating agent
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 #37402)
Chemistry
WAEC / WASSCE 2009
Oxidation, Reduction & Redox Reactions
Which of the following oxides of nitrogen has oxidation number of + 1?
A
KNO3
B
N2O
C
N2O3
D
NO
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 #37404)
Chemistry
WAEC / WASSCE 2009
Organic Chemistry I: Hydrocarbons & Crude Oil
The separation of petroleum fractions depends on the differences in their
A
boiling points
B
molar masses
C
melting point
D
solubilities
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 #37405)
Chemistry
WAEC / WASSCE 2009
Organic Chemistry I: Hydrocarbons & Crude Oil
Which of the following raw materials is used in the plastic industry ?
A
Calcium
B
Ethene
C
Hydrogen
D
Methane
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 #37406)
Chemistry
WAEC / WASSCE 2009
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
The product of the reaction between C\(_2\)H\(_5\)OH and concentrated H\(_2\)SO\(_4\) at 170\(^0\)C is
A
(C2H5)2SO4
B
CH 3CH 2HSO 4
C
(C2H5)2O
D
CH2 = CH 2
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Ethanol undergoes intramolecular dehydration at 170\(^0\)C, to produce ethene, CH\(_2\)=CH\(_2\). Concentrated sulphuric acid acts as a catalyst. It also acts as a dehydrating agent. This process eliminates a water molecule.
Source: Myschool Past Questions Archive (Record #37408)
Chemistry
WAEC / WASSCE 2009
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
When protein is heated to a high temperature it undergoes
A
condensation
B
denaturation
C
hydrolysis
D
polymerization
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 #37410)
Chemistry
WAEC / WASSCE 2009
Stoichiometry, Mole Concept & Volumetric Analysis
What is the molecular formula of a compound with empirical CH2O and vapour density of 90? [H = 1, C = 12, O = 16]
A
C4H8O 2
B
C4H 8O3
C
C6H10C5
D
C6H12O6
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 #37411)
Chemistry
WAEC / WASSCE 2009
Stoichiometry, Mole Concept & Volumetric Analysis
What is the product of the reaction between propene and 1 mole of hydrogen iodide?
A
CH3CHICH3
B
CH 3CH2CHI2
C
CH 3CH 2CI3
D
CH 3CHICH2I
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 #37412)
Chemistry
WAEC / WASSCE 2009
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Ethanol reacts with excess acidified K2Cr 2O7 to produce
A
ethanal
B
ethane
C
ethanoic acid
D
ethylethanoate
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 #37413)
Chemistry
WAEC / WASSCE 2009
Acids, Bases, pH & Salts
Dry hydrogen chloride when dissolved in methylbenzene
A
turns blue litmus paper red
B
turns red litmus paper blue
C
does not affect litmus paper
D
bleaches litmus paper
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 #37414)
Chemistry
WAEC / WASSCE 2009
Air & Environmental Chemistry
A consequence of global warming is
A
air pollution
B
flooding
C
increased humidity
D
low rainfall
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 #37415)
Chemistry
WAEC / WASSCE 2009
Non-Metals & Their Compounds
The major product in the solvay process is
A
NaOH
B
Na 2CO 3
C
NH 3
D
H 2SO4
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 #37416)
Chemistry
WAEC / WASSCE 2009
Metals, Transition Elements & Extraction
Which of the following alloys does not contain copper? l. Brass II. Bronze III. Steel
A
l only
B
ll only
C
lll only
D
ll and lll only
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 #37417)
Chemistry
WAEC / WASSCE 2009
Atomic Structure, Orbitals & Nuclear Chemistry
The electron configuration of carbon atom in its excited state is [ 6C]
A
1s22s 22px12py 1
B
1s 2 2s 22px 22pyo
C
1s12s22px12py12pz1
D
1s 22s12px12py12pz1
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 #37419)