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Chemistry
WAEC / WASSCE 1988
Stoichiometry, Mole Concept & Volumetric Analysis
What volume of oxygen will be left unreacted when a mixture of 100cm3 of hydrogen and 200cm,sup>3,/sup> of oxygen are exploded in a eudiometer?
A
300cm3
B
200cm3
C
150cm3
D
100cm3
E
50cm3
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 #36043)
Chemistry
WAEC / WASSCE 1988
Organic Chemistry I: Hydrocarbons & Crude Oil
How many isomers can be obtained from C4H10?
A
o
B
1
C
2
D
3
E
4
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 #36044)
Chemistry
WAEC / WASSCE 1988
Non-Metals & Their Compounds
Solution
Water gas is a mixture of?
A
CO2 and H2
B
CO and H2O
C
CO2 and CO
D
CO and N2
E
CO and H2
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
Water gas is a flammable, poisonous, gaseous mixture of hydrogen and carbon monoxide that is used as a fuel. It is also known as syngas or producer gas. i.e CO + H\(_2\)
Source: Myschool Past Questions Archive (Record #36045)
Chemistry
WAEC / WASSCE 1988
Oxidation, Reduction & Redox Reactions
Which of the following metals cannot extracted from its ore by using carbon (ll) oxide as the reducing agent?
A
Cu
B
Zn
C
Al
D
Pb
E
Fe
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 #36046)
Chemistry
WAEC / WASSCE 1988
Metals, Transition Elements & Extraction
Solution
Which of the following is not a naturally occurring iron ore?
A
FeCl2
B
Fe3O4
C
Fe2O3
D
FeCO3
E
FeS2
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
FeCl\(_2\) is not a naturally occurring iron ore; it is a compound that can be formed when iron minerals react with hydrochloric acid. The main naturally occurring iron ores are minerals like hematite (Fe\(_2\)O\(_3\)), magnetite (Fe\(_3\)O\(_4\)), and limonite (FeO(OH)⋅nH\(_2\)O)). However, a natural mineral called lawrencite, which is a natural form of ferrous chloride ((Fe,Ni)Cl\(_2\)), does exist, but it is rare and typically found in meteorites.
Source: Myschool Past Questions Archive (Record #36047)
Chemistry
WAEC / WASSCE 1988
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following equations represents the reaction of chlorine with hot concentrated sodium hydroxide solution?
A
2NaOH+CI2 → NaCIO + NaCI + H2O
B
4NaOH + 2CI → 4NaCI + 2H2O + O2
C
6NaOH + 3CI2 → NaCIO3 + 5NaCI + 3H2O
D
2NaOH + CI2 → 2NaCI + H2O2
E
NaOH + 2CI2 + H2O → NaCI + 3HCI + O2
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 #36048)
Chemistry
WAEC / WASSCE 1988
Periodic Table & Periodicity
Aqueous sodium trioxocarbonate (IV) solution is alkaline because
A
acid from which it is formed is strong
B
sodium is an alkali metal
C
sodium trioxocarbonate (IV) is decomposed by water
D
sodium trioxocarbonate (lV) is stable to heat
E
sodium triocarbonate (IV) is hydrolysed in water
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #36049)
Chemistry
WAEC / WASSCE 1988
Chemical Bonding & Intermolecular Forces
Which of the following correctly explains why iodine crystals change directly into the gaseous state when heated?
A
lodine crystals sublime
B
lodine atoms are held together by strong forces
C
lodine molecules are held together by weak forces
D
lodine molecules are covalent
E
lodine is a solid at room temperature
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 #36050)
Chemistry
WAEC / WASSCE 1988
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following is a waste product in the Solvary Process for the manufacture of sodium trioxocarbonate (IV)?
A
Ammonium chloride
B
Brine
C
Limestone
D
Calcium oxide
E
Calcium chloride
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #36051)
Chemistry
WAEC / WASSCE 1988
Stoichiometry, Mole Concept & Volumetric Analysis
When copper (ll) chloride solution is treated with excess aqueous ammonia, a deep blue solution results This is due to the presence of
A
(CuNH4)3+ ions
B
(CuCI4)2-ions
C
[Cu(OH)4]2- ions
D
Cu(H2-O)42+ IONS
E
[cU(NH3)4] ions
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #36052)
Chemistry
WAEC / WASSCE 1988
Acids, Bases, pH & Salts
The complex salt formed when aluminium dissolves in sodium hydroxide solution is
A
Na3AI(OH)4
B
Na2AI(OH)3
C
NaAI(OH)3
D
Na4AI(OH)4
E
NaAI(OH)4
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #36053)
Chemistry
WAEC / WASSCE 1988
Chemical Energetics & Thermochemistry
The reaction represented by the equation C(s) + H2O(l) → CO(s) + H 2(s) was carried out at 27oC if the enthalpy change was + 4500 J and the entropy change was + 12J, what was the free energy change? (∆G = ∆H - T∆S)
A
- 4176 J
B
+4176 J
C
- 900 J
D
+ 900 J
E
+8100 J
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 #36054)
Chemistry
WAEC / WASSCE 1988
Electrolysis & Electrochemical Cells
During the electrolysis of dilute tetraoxosulphate (VI) acid solution 0.05 mole of electrons were passed what volume of gas was produced at the anode? (Gaseous molar volume = 22. 4dm3 at s.t.p)
A
0.224 dm3
B
0.280 dm3
C
0.560 dm3
D
2.24 dm3
E
22.4 dm3
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 #36055)
Chemistry
UTME / JAMB 1988
Kinetic Theory of Matter & Gas Laws
Solution
Which of the following statements is NOT correct?
A
The average kinetic energy of a gas is directly proportional to its temperature
B
At constant temperature, the volume of a gas increases as the pressure increases
C
The pressure of a gas is directly proportional to the density.
D
The temperature of a gas is directly proportional to its volume
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship. If volume increases, then pressure decreases.
Option A,C and D are correct except option B which is incorrect.
Source: Myschool Past Questions Archive (Record #2)
Physics
WAEC / WASSCE 1988
Current Electricity & Electric Circuits
Which of the units of the following physical quantities are derived? I. Area II. Thrust III. Pressure IV. Mass
A
I, II, III & IV
B
I, II, III only
C
I, II, IV only
D
I, & III only
E
I & IV only
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #16329)