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Chemistry
WAEC / WASSCE 2010
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
What is the volume occupied by 2 moles of ammonia at s.t.p?
A
44.8 dm-3
B
22.4 dm-3
C
11.2 dm-3
D
5.6 dm-3
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Number of moles, n = \(\frac{Volume}{Molar volume}\)
Given:
n = 2 moles
Molar Volume at STP = 22.4dm\(^3\)
V = ?
n = \(\frac{Volume}{Molar volume}\)
V = n x Molar volume = 2 x 22.4 = 44.8 dm\(^3\)
Source: Myschool Past Questions Archive (Record #37458)
Chemistry
WAEC / WASSCE 2010
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following apparatus can be used to measure accurately a specific volume of a liquid?
A
Beaker
B
Conical flask
C
Measuring cylinder
D
Pipette
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 #37459)
Chemistry
WAEC / WASSCE 2010
Stoichiometry, Mole Concept & Volumetric Analysis
A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon (IV) oxide to diffuse under the same condition? [C = 12.0, O = 16.0]
A
5.8 seconds
B
6.8 seconds
C
9.4 seconds
D
11.0 seconds
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 #37463)
Chemistry
WAEC / WASSCE 2010
Particulate Nature of Matter, Laws & Formulae
Solution
Which of the following gases contains the highest number of atoms at s.t.p?
A
6 moles of neon
B
3 moles of oxygen
C
2 moles of chlorine
D
1 mole of ethane
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Count Atomicity for Each Gas
Neon (Ne): A noble gas, which is monoatomic (1 atom per molecule).
Oxygen (O\(_2\)): A diatomic gas (2 atoms per molecule).
Chlorine (Cl\(_2\)): A diatomic gas (2 atoms per molecule).
Ethane (C\(_2\)H\(_6\)): A polyatomic molecule containing 2 carbon atoms and 6 hydrogen atoms (8 atoms per molecule).
Source: Myschool Past Questions Archive (Record #37464)
Chemistry
WAEC / WASSCE 2010
Chemical Energetics & Thermochemistry
The determination of heat of combustion is carried out with
A
a thermometer
B
a bomb calorimeter
C
an evaporating dish
D
a boiling tube
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 #37465)
Chemistry
WAEC / WASSCE 2010
Reaction Rates & Chemical Equilibrium
The minimum amount of energy required for effective collisions between reacting particles is known as
A
activation energy
B
bond energy
C
kinetic energy
D
potential energy
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 #37466)
Chemistry
WAEC / WASSCE 2010
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following oxides is basic?
A
NO2
B
AI2O3
C
SO2
D
CaO
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 #37470)
Chemistry
WAEC / WASSCE 2010
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following equimolar solutions would have the highest conductivity?
A
NH4NO3(aq)
B
NaNO3(aq)
C
Mg(NO3)2(aq)
D
AI(NO3)3(aq)
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 #37471)
Chemistry
WAEC / WASSCE 2010
Acids, Bases, pH & Salts
The following substances are normal salts except
A
AI(NO3)3
B
FeSO4
C
Mg(OH)NO3
D
NaCI
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 #37475)
Chemistry
WAEC / WASSCE 2010
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following chlorides is insoluble in water?
A
AgCI
B
KCI
C
NH4CI
D
ZnCI2
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 #37476)
Chemistry
WAEC / WASSCE 2010
Water, Solutions & Solubility
Which of the following factors would not affect the solubility of a gas?
A
Concentration
B
Nature of solvent
C
Pressure
D
Temperature
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 #37477)
Chemistry
WAEC / WASSCE 2010
Reaction Rates & Chemical Equilibrium
Consider the equilibrium reaction represented by the following equation: 2SO2(g) + O2(g) ⇌ 2SO3(g); ∆H = 395.7 kJmol-1 Which of the following statements about the equilibrium system is correct?
A
Addition of catalyst changes the equailibrium position
B
Decrease in pressure increase in temperature SO3
C
Decrease in pressure increases the equilibrium concentration of O2
D
Increase in temperatur favours the forward reaction
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 #37480)
Chemistry
WAEC / WASSCE 2010
Reaction Rates & Chemical Equilibrium
The rate of chemical reaction of solids are not affected by
A
catalyst
B
pressure
C
particle size
D
temperature
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 #37481)
Chemistry
WAEC / WASSCE 2010
Electrolysis & Electrochemical Cells
Solution
Which of the following statements about the cell notation Mg/Mg\(^{2+}\)//Cu\(^{2+}\)/Cu is correct?
A
copper is the anode
B
Manesium is reduced
C
Magnesium is the anode
D
The double line represents the electrodes
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Below is the interpretation of the cell notation Mg/Mg\(^{2+}\)//Cu\(^{2+}\)/Cu:
Mg/Mg\(^{2+}\) ⇒ Mg is the anode, where oxidation is taking place as there is an increase in oxidation number from 0 to +2
// ⇒ This represents the salt bridge or a porous barrier separating the two half-cells.
Cu\(^{2+}\)/Cu ⇒ This represents the copper electrode (cathode) and its corresponding copper ions in solution. Copper ions are reduced to copper metal.
Therefore, the correct statement is Magnesium is the anode - Option C
Source: Myschool Past Questions Archive (Record #37482)
Chemistry
WAEC / WASSCE 2010
Electrolysis & Electrochemical Cells
Solution
Which of the following statements about the electrolysis of CuSO4(aq) using copper cathode and platinum anode is not correct?
A
Copper is deposited at the cathode
B
Oxygen is liberated at the anode
C
it is used for the purification of copper
D
The solution becomes acidic
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
For purifying impure copper, the anode electrode is impure copper while the cathode electrode is pure copper, but for this question, two different electrodes were used, hence option C is the correct option to this question.
Source: Myschool Past Questions Archive (Record #37528)