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Chemistry
WAEC / WASSCE 2003
Kinetic Theory of Matter & Gas Laws
Which of the following quantities is the same for one mole of Br2(l) and one mole of He(g)?
A
Number of molecules
B
Number of atoms
C
Total mass of the particles
D
Volume occupied at s.t.p
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 #36965)
Chemistry
WAEC / WASSCE 2003
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which of the following acids is dibasic?
A
Hydrochloric acid
B
Trioxosulphate (IV) acid
C
Dioxonitrate (lll) acid
D
Ethanoic acid
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 #36966)
Chemistry
WAEC / WASSCE 2003
Acids, Bases, pH & Salts
Solution
Bees inject an acidic substance when they sting. Which of the following chemical could be used to treat bee stings?
A
CH3COOH
B
NaHCO3
C
C2H5OH
D
H2O2
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Bees on the other hand have acidic toxins in their stings, and so an alkaline solution should be applied to neutralize them. Baking soda (\(NaHCO_{3}\)) mixed with cold water is usually the most effective way of making an alkaline solution.
Source: Myschool Past Questions Archive (Record #36967)
Chemistry
WAEC / WASSCE 2003
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following salts can be prepared by reacting the metal with dilute H2SO4?
A
CuSO4
B
MgSO4
C
BaSO4
D
PbSO4
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 #36968)
Chemistry
WAEC / WASSCE 2003
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Which of the following solutions will give a precipitate with dilute tetraoxosulphate (V) acid? l. Lead (ll) trioxonitrate (V) solution ll. Barium chloride solution lll. Sodium chloride solution
A
l only
B
ll only
C
l and ll only
D
ll and lll only
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Both i and ii will precipitate with H2SO4, SEE EQUATION BELOW
Pb(NO3)2+H2SO4→PbSO4+2HNO3.
H2SO4 +BaCl2 → BaSO4 + 2HCl
both PbSO4 and BaS04 are slightly solid so they precipitate out of solution as solid
Source: Myschool Past Questions Archive (Record #36969)
Chemistry
WAEC / WASSCE 2003
Acids, Bases, pH & Salts
Substance Q reacts with cold water to form a solution which turns red litmus blue. Substance Q could be
A
zinc
B
phosphorus
C
lead
D
sodium
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 #36970)
Chemistry
WAEC / WASSCE 2003
Oxidation, Reduction & Redox Reactions
A reducing agent is expected to
A
decolourize acidified KMnO4 solution
B
decolourize acidified FeSO4 solution
C
liberate CI2 from a chloride
D
liberate CO2 from NaHCO3
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 #36981)
Chemistry
WAEC / WASSCE 2003
Electrolysis & Electrochemical Cells
Consider the electrochemical cell represented below Zn(s)/Zn2+(aq)//Cu2+(aq)/Cu(s). Which of the following equations describes the reaction occurring in the cell?
A
Cu(s) + Zn2+(aq) →Cu2+(aq) + Zn(s)
B
Cu(s) + Zn(s) →Cu2+(aq) + Zn2+(aq)
C
Zn(s) + Cu2+(aq) →Zn2+(aq) + Cu(s)
D
Zn2+(aq) +Cu2+(aq) → Zn(s) + Cu(s)
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 #36983)
Chemistry
WAEC / WASSCE 2003
Stoichiometry, Mole Concept & Volumetric Analysis
Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z.
Which of the metals cannot displace Y from an aqueous solution of its salt?
A
V
B
W
C
X
D
Z
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 #36985)
Chemistry
WAEC / WASSCE 2003
Electrolysis & Electrochemical Cells
Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z.
Which of the metals is most likely extracted by the electrolysis of its fused chloride?
A
V
B
W
C
X
D
Z
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 #36987)
Chemistry
WAEC / WASSCE 2003
Electrolysis & Electrochemical Cells
Which of the following statements is/are correct about tin plating? l The electrolyte must be a soluble salt of tin ll. the objective to be plated is made the cathode lll. The anode is made of tin lV. The negative electrode dissolves
A
L only
B
l and ll only
C
l,ll and lll only
D
l, ll and lV 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 #36990)
Chemistry
WAEC / WASSCE 2003
Acids, Bases, pH & Salts
Solution
What term is used to describe an oxide whose aqueous solution turns blue litmus red?
A
Strong electrolyte
B
Acid anhydride
C
Amphoteric oxide
D
Basic oxide
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
An oxide that turns blue litmus red is acidic in nature. The term acid anhydride specifically refers to non-metal oxides that react with water to form an acidic solution. For example, sulphur trioxide (SO\(_3\)) is the acid anhydride of sulphuric acid (H\(_2\)SO\(_4\)).
When these oxides dissolve in water, they produce hydrogen ions (H+) or hydronium ions (H\(_3\)O\(^+\)), which are responsible for changing the colour of blue litmus paper to red.
Source: Myschool Past Questions Archive (Record #36971)
Chemistry
WAEC / WASSCE 2003
Acids, Bases, pH & Salts
The pH of 0.50 mol dm-3 solutions of HCI, H2SO4 and CH3COOH were measured. which of the following statements about the values obtained is correct?
A
the pH value was equal to 5 in each case
B
the pH values of the HCI and H2SO4 solutions were equal
C
their pH values added uo to 14
D
the pH value of the CH3COOH was the highest.
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 #36972)
Chemistry
WAEC / WASSCE 2003
Acids, Bases, pH & Salts
Which of the following processes involves neutralization?
A
Hardening of oils
B
Souring of milk
C
Charring of sugar
D
Liming of soil
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 #36973)
Chemistry
WAEC / WASSCE 2003
Stoichiometry, Mole Concept & Volumetric Analysis
Sea shells contain mainly CaCO 3. Calcium oxide can be prepared from sea shells by
A
adding dilute acid
B
heating at a high temperature
C
reduction with CO
D
adding dilute NaOH(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 #36975)