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Chemistry
WAEC / WASSCE 2011
Stoichiometry & Mole Concept
Which of the following statements about a molar solution is correct? it
A
is a supersaturated solution
B
cannot dissolve more of the solute at that temperature
C
contains any amount of solute in a given volume of solution
D
contains one mole of the solute in 1 dm3 of solution
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 #37607)
Chemistry
WAEC / WASSCE 2011
Matter & Separation Techniques
A gas that is collected by upward delivery is likely to be
A
heavier than air
B
insoluble in water
C
lighter than air
D
soluble in water
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 #37608)
Chemistry
WAEC / WASSCE 2011
Matter & Separation Techniques
Bubbling excess carbon (IV) oxide into calcium hydroxide solution results in the formaton of
A
CaO
B
Ca(HCO3)2
C
H2CO3
D
CaCO3
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 #37609)
Chemistry
WAEC / WASSCE 2011
Matter & Separation Techniques
The equation P = \(\frac{K}{V}\) illustrates
A
Boyle's law
B
Charles' law
C
Dalton's law
D
Gay Lussac's law
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 #37610)
Chemistry
WAEC / WASSCE 2011
Matter & Separation Techniques
The initial volume of a gas at 300 K was 220 cm 3 Determine its temperature if the volume became 250 cm 3
A
183 K
B
264 K
C
300 K
D
341 K
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 #37611)
Chemistry
WAEC / WASSCE 2011
Stoichiometry & Mole Concept
Which of the following equimolar solutions has the highest conductivity?
A
CH3COOH(aq)
B
H2CO3(aq)
C
H 2SO 4(aq)
D
NaOH (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 #37612)
Chemistry
WAEC / WASSCE 2011
Acids, Bases, and Salts
Which of the following statements about enthalpy of neutralization is correct? It
A
is constant for a strong acid and a strong base
B
cannot be determined using calorimeter
C
has a positive value
D
is higher for strong acid and a weak base
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 #37614)
Chemistry
WAEC / WASSCE 2011
Matter & Separation Techniques
When NH 4CI was dissolved in water, the container was cold to touch. This implies that
A
the process is endothermic
B
the process is exothermic
C
NH4CI is highly soluble in water
D
NH 4CI forms a saturated solution
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 #37615)
Chemistry
WAEC / WASSCE 2011
Acids, Bases, and Salts
Which of the following metallic oxides is amphoteric?
A
AI2O3
B
Fe2O3
C
MgO
D
Na2O
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 #37620)
Chemistry
WAEC / WASSCE 2011
Stoichiometry & Mole Concept
Solution
On evaporation to dryness, 250 cm3 of saturated solution of salt X with relative molar mass 101 gave 50.5g of the. What is the soluility of the salt?
A
1.0 mol dm-3
B
2.0 mol dm-3
C
4.0 moldm-3
D
5.0 moldm-3
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
50.5g 0f salt X is contained in 250cm3,
what mass of X is contained in 1000cm3
= (50.5 x 1000) \div 250 = 202g
no of moles of salt x = mass\div molar mass
= 202\div 101 = 2.0mol/dm3
Source: Myschool Past Questions Archive (Record #37625)
Chemistry
WAEC / WASSCE 2011
Kinetics, Energetics and Equilibrium
Solution
Consider the following reaction equation:
X(g) + Y(g) ⇌ XY(g); ∆H = + 220KJ mol-1 If the temperature of the system is increased, the
A
backward reaction would be favoured
B
forward reaction would favoured
C
reaction would stop
D
reaction would be at equilibrium
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
According to Le Chatelier's principle, in an endothermic reaction (whenever delta H = +), an increase in temperature will cause the equilibrium position to shift to the right, thereby leading to the formation of more of the product i.e The forward reaction will be favoured while a decrease in temperature will cause the equilibrium position to shift to the left. Which implies the backward reaction will be favoured. The reverse is the case in an exothermic reaction ( whenever delta H = - ). Therefore, the correct answer is option B.
Source: Myschool Past Questions Archive (Record #37628)
Chemistry
WAEC / WASSCE 2011
Matter & Separation Techniques
What is the value of n in the following equation? Cr2O72- + 14H+ + ne- → 2Cr 3+ + 7H2O
A
2
B
3
C
6
D
7
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 #37629)
Chemistry
WAEC / WASSCE 2011
Stoichiometry & Mole Concept
What mass of copper would be formed when a current of 10.0 A is passed through a solution of CuSO4 for 1 hour? [Cu = 63.5; 1F = 96500C]
A
5.9 g
B
11.8 g
C
23.8 g
D
47.3 g
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 #37630)
Chemistry
WAEC / WASSCE 2011
Electrochemistry and Redox
Which of the following metals could be used as sacrifical anode for preventing the corrosion of iron?
A
Copper
B
Lead
C
Magnesium
D
Silver
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 #37631)
Chemistry
WAEC / WASSCE 2011
Electrochemistry and Redox
Consider the following electrochemical cell notation: M(s) / M2+ (aq)// H+ (aq)/ H2(g). The value of the electrode potential is positive when?
A
electrons flow from the metal electrode, M(s) to hydrogen electrode, H2(g)
B
electrons fow from hydrogen electrode, H2(g) to metal electrode, M(s)
C
the flow of current is high
D
there is equilibrium between the flow of electrons from the hydrogen electrode, H2(g) to metal electrode, M(s)
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 #37632)