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Chemistry
UTME / JAMB 1994
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
The set-up above would be useful for determining the amount of
Attached Figure / Diagram
A
oxygen in air
B
water vapour in air
C
CO2 in air
D
arygen in air
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 #31484)
Chemistry
UTME / JAMB 1994
Chemical Energetics & Thermochemistry
Diagram
The ∆H for the reaction represented by the energy profile above is
Attached Figure / Diagram
A
-100 kJ mol--1
B
+ 100 kJ mol-1
C
+50 kJ mol-1
D
-50 kJ mol-1
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 #31486)
Chemistry
UTME / JAMB 1994
Reaction Rates & Chemical Equilibrium
Diagram
In the diagram above the activation energy is represented by
Attached Figure / Diagram
A
y - x
B
x
C
x - z
D
y
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 #31487)
Chemistry
UTME / JAMB 1994
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
The IUPAC name of the compound above is
Attached Figure / Diagram
A
2,2-dimethyl but -1-yne
B
2,2-dmethyl but -1-ene
C
3,3-dimethyl but -1-ene
D
3,3-dimethyl but-1-yne
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 #31517)
Chemistry
UTME / JAMB 1994
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Diagram
Solution
Use the diagram above to answer this question. The reaction taking place in flask G is known as?
Attached Figure / Diagram
A
hydrolysis
B
double decomposition
C
dehydration
D
pyrolysis
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The reaction of conc. \(H_2SO_4\) with ethyl ethanol is a dehydration reaction. a process used in producing ethene from alcohol.
Source: Myschool Past Questions Archive (Record #31518)
Chemistry
UTME / JAMB 1994
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
From the above diagram, the caustic soda in the conical flask serves to
A
dry ethene gas
B
remove carbon (iv) oxides from ethene
C
remove carbon (ii) oxide from ethene
D
remove sulphur (iv) oxide from ethene
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Caustic soda, \(NaOH\) , serves to remove gaseous impurities from the gas evolved during the laboratory preparation of ethene. Basically, the major impurities are Sulphur (IV) oxide and Carbon (IV) oxide.
Source: Official Exam / Past Question Archive
Chemistry
UTME / JAMB 1994
Oxidation, Reduction & Redox Reactions
Solution
MnO4(aq) + 8H + 5Fe2+ \(\to\) Mn2+(aq) + 5Fe3+(aq) + H2O. The oxidation number of maganese in the above reaction changed from
A
+7 to +2
B
+6 to +2
C
+5 to +2
D
+4 to +2
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
\(MnO_{{4}{(aq)}}\) has a charge of \(-1\)
Let the oxidation number of \(Mn\) in \(MnO_{{4}{(aq)}}\) be X
Recall, the oxidation number of \(O_{2}\) is \(-2\)
\(\therefore\) \(X + (-2\times 4) = -1\)
\(X - 8 = -1\)
\(X = +7\)
Source: Myschool Past Questions Archive (Record #44422)
Chemistry
UTME / JAMB 1994
Acids, Bases, pH & Salts
Solution
which of these metals CANNOT replace hydrogen from alkaline solutions?
A
Aluminium
B
Zinc
C
Tin
D
Iron
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Aluminum, Zinc, and Tin react with both acids and alkalis to liberate hydrogen and so all are amphoteric metals except iron.
Iron can displace hydrogen from acids, but not from alkaline solutions. Iron is a metal that is more reactive than hydrogen and therefore can displace hydrogen from acids, but not from alkaline solutions.
In general, metals that are more reactive than hydrogen can displace hydrogen from acids. This means that when a metal reacts with an acid, the metal replaces the hydrogen in the acid, forming a salt and releasing hydrogen gas. Iron is considered a reactive metal and is placed above hydrogen in the reactivity series, which means it can displace hydrogen from acids. In alkaline solutions (solutions with a high pH, like those containing hydroxide ions), the hydrogen is not in a form that can be easily displaced by metals. Instead, the alkaline solution contains hydroxide ions (OH-) and the metal will react with these ions to form a hydroxide or oxide.
Source: Myschool Past Questions Archive (Record #44423)
Chemistry
UTME / JAMB 1994
Stoichiometry, Mole Concept & Volumetric Analysis
Clothes should be properly rinsed with water after bleaching because
A
the bleach decolourizes the clothes
B
chlorine reacts with fabrics during bleaching
C
the clothes are sterilized during bleaching
D
hydrogen chloride solution is produced during bleaching
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 #44425)
Chemistry
UTME / JAMB 1994
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
When sodium ethanoate is treated with a few drops of concentrated tetraoxosulphate(vi)acid. one of the products is
A
CH3COOH
B
CH3COOCH3
C
CH3COOC2H5
D
C2H5COOCH3
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
When sodium ethanoate (CH\(_3\)COONa) is treated with concentrated tetraoxosulphate(VI) acid (H\(_2\)SO\(_4\)), a displacement reaction occurs. The strong mineral acid (H\(_2\)SO\(_4\)) reacts with the salt of the weaker organic acid to displace and liberate the organic acid, which is ethanoic acid (also known as acetic acid, CH\(_3\)COOH).
Source: Myschool Past Questions Archive (Record #44427)
Chemistry
UTME / JAMB 1994
Organic Chemistry I: Hydrocarbons & Crude Oil
Diagram
Solution
From the above diagram, the caustic soda in the conical flask serves to
Attached Figure / Diagram
A
dry ethene gas
B
remove carbon (iv) oxides from ethene
C
remove carbon (ii) oxide from ethene
D
remove sulphur (iv) oxide from ethene
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Caustic soda, \(NaOH\) , serves to remove gaseous impurities from the gas evolved during the laboratory preparation of ethene. Basically, the major impurities are Sulphur (IV) oxide and Carbon (IV) oxide.
Source: Myschool Past Questions Archive (Record #44428)
English Language
UTME / JAMB 1994
Reading Comprehension, Summary & Composition
A suitable title for the passage is
A
Women in politics
B
Champions of women liberation
C
Great women of yesteryears
D
Electioneering campaigns
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Official Exam / Past Question Archive
Biology
UTME / JAMB 1994
Variety of Organisms & Classification of Living Things
Green plants are distinguished from other living organisms by their ability to
A
make use of water
B
make use of oxygen
C
respond to sunlight
D
manufactured their own food
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #5321)
Biology
UTME / JAMB 1994
Variety of Organisms & Classification of Living Things
The soil swallowed by the earthworm to form the worm cast is grouped up in the
A
clitellum
B
protomium
C
mouth
D
gizzard
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #5322)
Biology
UTME / JAMB 1994
Growth, Micro-organisms & Public Health
Which is the correct order in an evolutionary sequence for the following plants groups?
A
Bacteria → ferns → algae → mosses → seed plants
B
Bacteria → ferns → mosses → algae → seed plants
C
Bacteria → algae → mosses → ferns → seed plants
D
Bacteria → mosses → algae → ferns → seed plants
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #5326)