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Chemistry
WAEC / WASSCE 2010
Matter & Separation Techniques
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
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, and 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
Matter & Separation Techniques
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
Matter & Separation Techniques
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
Kinetics, Energetics and 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
Matter & Separation Techniques
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
Acids, Bases, and Salts
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
Electrochemistry and Redox
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)
Chemistry
WAEC / WASSCE 2010
Electrochemistry and Redox
What is the change in oxidation number of manganes in the reaction represented by the following equation? MnO-4(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)
A
+3 to + 2
B
+ 4 to + 2
C
+ 5 to + 2
D
+ 7 to 2
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 #37529)
Chemistry
WAEC / WASSCE 2010
Stoichiometry & Mole Concept
The quantity of electricity required to discharge 1 mole of univalent ion is
A
9,600 C
B
48,250 C
C
96,500 C
D
193,00 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 #37533)
Chemistry
WAEC / WASSCE 2010
Matter & Separation Techniques
Fact and oils are used as raw materials in the following industries except
A
paint industry
B
plastic industry
C
margarine industry
D
cosmetics industry
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 #37534)
Chemistry
WAEC / WASSCE 2010
Matter & Separation Techniques
Solution
An advantage of detergent over soap is that detergents
A
are readily available
B
are in powerdered from
C
are non-biodegradable
D
lather readily with water
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Detergent lather readily with water. Soap does not lather readily with water. Soap is a good cleansing agent in soft water, in hard water it forms scum.
Source: Myschool Past Questions Archive (Record #37538)
Chemistry
WAEC / WASSCE 2010
Matter & Separation Techniques
The products of fermentation of sugar are
A
carbon(IV) oxide and water
B
ethanol and carbon (IV) oxide
C
ethanol and water
D
ethanol and enzymes
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 #37539)
Chemistry
WAEC / WASSCE 2010
Matter & Separation Techniques
The IUPAC name of C2H6COOC2,/sub>H6 is
A
ethyethanoate
B
ethylproanoate
C
propylethanoate
D
propylpropanoate
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 #37540)