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Chemistry
UTME / JAMB 1993
Organic Chemistry I: Hydrocarbons & Crude Oil
The fraction of crude oil used as jet fuel is?
A
refinery gas
B
diesel oil
C
kerosene
D
gasoline
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 #13452)
Chemistry
UTME / JAMB 1993
Organic Chemistry I: Hydrocarbons & Crude Oil
It is not desirable to use lead tetraethyl as an anti-knock agent because?
A
it is expensive
B
of pollution effects from the exhaust fumes
C
it lowers the octane rating of petrol
D
it is explosive
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 #13454)
Chemistry
UTME / JAMB 1993
Acids, Bases, pH & Salts
Al2O3(s) + 3H2SO4(aq) → Al2(SO4(aq)) + 3H2(I)O
Al2O3(s) + 2NaOH(aq)) + 3H2(I)O → 2NaAl(OH)4(aq)).
We can conclude from the equations above that Al2O3(s) is?
A
an acidic oxide
B
an amphoteric oxide
C
a basic oxide
D
a neutral oxide
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 #13456)
Chemistry
UTME / JAMB 1993
Chemical Bonding & Intermolecular Forces
The carbon atoms on ethane are?
A
sp2 hybridized
B
sp3 hybridized
C
sp2d hybridized
D
sp hybridized
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 #13457)
Chemistry
UTME / JAMB 1993
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Palm wine turns sour with time because?
A
the sugar content is converted into alcohol
B
the carbon (IV) oxide formed during the fermentation process has a sour taste
C
it is commonly adulterated by the tappers and sellers
D
microbial activity results in the production of orgain acids within it
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 #13458)
Chemistry
UTME / JAMB 1993
Organic Chemistry I: Hydrocarbons & Crude Oil
Catalytic hydrogenation of benzene produces?
A
an aromatic hydrocarbon
B
margarine
C
cyclohexane
D
D.D.T
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 #13459)
Chemistry
UTME / JAMB 1993
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which of the following represents saponification?
A
Reaction of carboxylic acids with sodium hydroxide
B
Reaction of alkanoates with acid
C
Reaction of alkanoates with alcohols
D
Reaction of alkanoates with sodium hydroxide
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 #13461)
Chemistry
UTME / JAMB 1993
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The confirmatory test for alkanoic acids in organic qualitative analysis is the?
A
turning of wet blue litmus paper red
B
reaction with alkanols to form esters
C
reaction with sodium hydroxide to form salt and water
D
reaction with aqueous Na2COsp3 to liberate a gas which turns lime water milky
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 #13469)
Chemistry
UTME / JAMB 1993
Oxidation, Reduction & Redox Reactions
Solution
A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?
A
sulphur (ii) oxide
B
hydrogen sulphide
C
sulphide (lV) oxide
D
hydrogen chloride
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Sulphur dioxide (SO₂) gas will turn an orange solution of acidified potassium dichromate (K₂Cr₂O₇) clear green. This colour change occurs because sulphur dioxide is a reducing agent, and it reduces the dichromate ion (Cr₂O₇²⁻) from its orange form to the green chromium(III) form (Cr³⁺).
Source: Myschool Past Questions Archive (Record #13682)
Chemistry
UTME / JAMB 1993
Kinetic Theory of Matter & Gas Laws
Diagram
Which of the curves above represents the behaviour of 1 mole of an ideal gas?
Attached Figure / Diagram
A
l
B
ll
C
lll
D
lV
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 #31462)
Chemistry
UTME / JAMB 1993
Water, Solutions & Solubility
Diagram
Solution
For which salt in the graph above does the solubility increase most rapidly with rise in temperature?
Attached Figure / Diagram
A
CaSO4
B
KNO3
C
NaCl
D
KCl
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
For many solids that are dissolved in water or any liquid, the solubility increases with a temperature rise. With an increase in kinetic energy, the solvent molecules effectively break apart the solute molecules that are held together by strong intermolecular attractions, and thereby solubility is increased.
Source: Myschool Past Questions Archive (Record #31463)
Chemistry
UTME / JAMB 1993
Oxidation, Reduction & Redox Reactions
Diagram
Solution
Half-cell reaction. From the data above , it can be deduced that the most powerful reducing agent of the four metals is
Attached Figure / Diagram
A
Cu
B
Fe
C
Ba
D
Zn
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
elements with lower electrode potentials are most likely to be reduced and act as a reducing agent. Lower electrode potential indicates a greater tendency to accept electrons.
Source: Myschool Past Questions Archive (Record #31465)
Chemistry
UTME / JAMB 1993
Chemical Energetics & Thermochemistry
Diagram
In the diagram above, curve X represents the energy profile for a homogeneous gaseous reaction. Which of the following conditions would produce curve Y for the same reaction?
Attached Figure / Diagram
A
Increase in temperature
B
Increase in the concentration of a reactant
C
Addition of a catalyst
D
Increase in pressure
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 #31466)
Chemistry
UTME / JAMB 1993
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Diagram
Solution
The two functional groups in the above compound are
Attached Figure / Diagram
A
alcohol and amine
B
acid and amine
C
aldehyde and acid
D
ketone and amine
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The two functional groups in the above compound are alkanoic acid (-COOH) and amine (-NH\(_2\).
Source: Myschool Past Questions Archive (Record #31468)
Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
The IUPAC nomenclature for the compound above is
Attached Figure / Diagram
A
dimethlhexane
B
3,5 dimethylhexane
C
1.1 dmethyl, 3 methylpentane
D
2.4 dimethylhexane
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 #31469)