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Chemistry
UTME / JAMB 1995
Chemical Energetics & Thermochemistry
Which of the following processes leads to increase in entropy?
A
Mixing a sample of NaCl and sand
B
Condensation of water vapour
C
Boiling a sample of water
D
Cooling a saturated solution
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 #13674)
Chemistry
UTME / JAMB 1995
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following equilibria is shifted to the right as a result of an increase in pressure?
A
H2(g) + I2(g) 2HI(g)
B
2NO2(g) N2O4(g)
C
PCl5(s) PCl3(s) + Cl2(g)
D
2O3(g) 3O2(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 #13676)
Chemistry
UTME / JAMB 1995
Atomic Structure, Orbitals & Nuclear Chemistry
Sulphur exists in six forms in the solid state. This property is known as?
A
isomerism
B
allotropy
C
isotopy
D
isomorphism
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 #13680)
Chemistry
UTME / JAMB 1995
Oxidation, Reduction & Redox Reactions
A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?
A
sulphur (lV) oxide
B
hydrogen sulphide
C
sulphide (lV) oxide
D
hydrogen chloride
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 #13683)
Chemistry
UTME / JAMB 1995
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following ions will give a white precipitate with aqueous NaOH and soluble in excess of the base?
A
Ca2+
B
Mg2+
C
Zn2+
D
Cu2+
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 #13684)
Chemistry
UTME / JAMB 1995
Metals, Transition Elements & Extraction
In the extraction of iron in the blast furnace, limestone is used to?
A
release CO2 for the reaction
B
reduce the iron ore
C
increase the strenght of the iron
D
remove impurities
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 #13686)
Chemistry
UTME / JAMB 1995
Metals, Transition Elements & Extraction
Which of the following compounds will impart a brick-red colour to a non-luminious bunsen flame?
A
NaCl
B
LiCl
C
CaCl2
D
MgCl2
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 #13688)
Chemistry
UTME / JAMB 1995
Stoichiometry, Mole Concept & Volumetric Analysis
Group 1 A metals are not found free in nature because they?
A
are of low melting and boiling points
B
have weak metallic bonding
C
conduct electricity and heat
D
are very reactive
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 #13691)
Chemistry
UTME / JAMB 1995
Stoichiometry, Mole Concept & Volumetric Analysis
CHCl3 + Cl2 → HCl + CCl4. The reaction above is an example of?
A
an addition reaction
B
a substitution reaction
C
a chlorination reaction
D
a condensation reaction
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 #13694)
Chemistry
UTME / JAMB 1995
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
Which of the following pairs has compounds that are isomers?
A
Propanal and propanone
B
Ethanoic acid and ethylmethanoate
C
Ethanoic acid and ethane-1, 2-diol
D
2-methylbutane and 2, 2-dimethylbutane
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Propanal and Propanone are functional isomers of each other with the functional group C=O
Source: Myschool Past Questions Archive (Record #13696)
Chemistry
UTME / JAMB 1995
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
Aromatic and aliphatic hydrocarbons can be distinguished from each other by the?
A
action of bromine
B
use of polymerization reaction
C
action of heat
D
use of oxidation reaction
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Aromatic and aliphatic hydrocarbons are most distinctively distinguished by their behavior when heated or burned.
Aromatic hydrocarbons (like benzene) have a high carbon-to-hydrogen ratio. When heated to ignition, they burn with a smoky, sooty yellow flame due to incomplete combustion of the high carbon content. Aliphatic hydrocarbons (like alkanes) generally burn with a cleaner, non-sooty flame because they have a higher proportion of hydrogen.
A. action of bromine: While bromine can distinguish between saturated (alkanes) and unsaturated (alkenes/alkynes) hydrocarbons, it is not the primary way to distinguish aromatic from aliphatic compounds generally. For example, both benzene (aromatic) and many alkanes (aliphatic) are relatively unreactive with bromine under standard conditions, while alkenes (aliphatic) react quickly.
B. use of polymerization reaction: Both aromatic (e.g., styrene) and aliphatic (e.g., ethylene) monomers can undergo polymerization. Therefore, this reaction is not a specific diagnostic test to tell them apart.
D. use of oxidation reaction: Both types of hydrocarbons can be oxidized under various conditions. While the specific products vary, oxidation is not used as a standard, simple laboratory test to distinguish the two classes.
Source: Myschool Past Questions Archive (Record #13697)
Chemistry
UTME / JAMB 1995
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The role of sodium chloride in the preparation of soap is to?
A
purify the soap
B
separate the soap from glycerol
C
accelerate the decomposition of the fat or oil
D
react with glycerol
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 #13699)
Chemistry
UTME / JAMB 1995
Organic Chemistry I: Hydrocarbons & Crude Oil
CxHY + 4O2 → 3CO2 + 2H2O. The hydrocarbon, CxHY, in the reaction above is?
A
propane
B
propene
C
propyne
D
propanone
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 #13700)
Chemistry
UTME / JAMB 1995
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
An example of a secondary amine is?
A
propylene
B
di-butylamine
C
methylamine
D
trimethylamine
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 #13701)
Chemistry
UTME / JAMB 1995
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The relatively high boiling points of alkanols are due to?
A
ionic bonding
B
aromatic character
C
covalent bonding
D
hydrogen bonding
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 #13703)