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Chemistry
UTME / JAMB 1992
Oxidation, Reduction & Redox Reactions
Solution
Safety matches contain sulphur and the following except?
A
sodium chloride
B
potassium trioxonitrate (V)
C
charcoal
D
phosphorus sulphide
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Modern safety matches usually have antimony sulfide, oxidizing agents such as potassium chlorate, and sulfur or charcoal in the heads, and red phosphorus in the striking surface.
Source: Myschool Past Questions Archive (Record #13226)
Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
Addition of an aqueous solution of a salt gives a white precipitate. The salt is likely to be a?
A
nitrate
B
carbonate
C
chloride
D
sulphide
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 #13227)
Chemistry
UTME / JAMB 1992
Acids, Bases, pH & Salts
Solution
Sodium hydroxide solution can be conveniently stored in a container made of?
A
lead
B
zinc
C
aluminium
D
copper
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Sodium hydroxide (NaOH) is a strong base that reacts with several common metals, making them unsuitable for storage. Copper is the correct choice because it does not react with sodium hydroxide under normal conditions.
Copper is a non-amphoteric metal and is relatively low in the electrochemical series, meaning it does not displace hydrogen from the base or form soluble complexes with the hydroxide ion.
Source: Myschool Past Questions Archive (Record #13228)
Chemistry
UTME / JAMB 1992
Non-Metals & Their Compounds
Which of the following is NOT used as a raw material in the Solvay process?
A
Ammonia
B
Sodium chloride
C
Calcium trioxocarbonate (IV)
D
Sodium trioxocarbonate (IV)
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 #13229)
Chemistry
UTME / JAMB 1992
Metals, Transition Elements & Extraction
Duralumin consists of aluminium, copper, ?
A
zinc and gold
B
lead and maganese
C
nickle and silver
D
manganese and magnesium
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 #13230)
Chemistry
UTME / JAMB 1992
Chemical Energetics & Thermochemistry
CaOs + H2O(l) → Ca(OH)2(s) ΔH -65 kj. The process represented by the above equation is known as?
A
dissolution
B
slaking
C
liming
D
mortaring
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 #13231)
Chemistry
UTME / JAMB 1992
Chemical Bonding & Intermolecular Forces
Solution
The carbon atoms in ethene are?
A
sp3 hybridized
B
sp hybridized
C
sp2 hybridized
D
not hybridized
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The hybridization in ethene (ethylene) is SP\(^2\). This means that each carbon atom in the molecule uses one s orbital and two p orbitals to form three hybrid orbitals, resulting in a trigonal planar geometry.
Source: Myschool Past Questions Archive (Record #13232)
Chemistry
UTME / JAMB 1992
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
Which of the following compounds reacts with sodium metal as well as silver and copper salts ?
A
CH3C Ξ C—CH3
B
CH3CH2CH23>
C
CH3C Ξ CH
D
CH3CH = CH CH3
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Propyne (CH\(_3\)C≡CH) reacts with sodium metal, and also with silver and copper salts. Propyne, being a terminal alkyne, has a relatively acidic terminal hydrogen. This acidity allows it to react with strong bases like sodium metal to form sodium acetylide. The acetylide anion formed in the reaction with sodium metal can be isolated and reacted with silver or copper salts to form insoluble silver and copper acetylides. These precipitates are useful for identifying the presence of terminal alkynes.
Source: Myschool Past Questions Archive (Record #13233)
Chemistry
UTME / JAMB 1992
Organic Chemistry I: Hydrocarbons & Crude Oil
Which of the following are isomers?
A
Ethanol and dimethyl ether
B
Benzene and methybenzene
C
Ethanol and propanone
D
Trichloromethane and tetrachloromethane
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 #13235)
Chemistry
UTME / JAMB 1992
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The functional group present in an organic compound which gives bubbles on treatment with a saturated solution of NaHCO3 is?
A
hydroxyl group
B
carboalkoxyl group
C
carbonyl group
D
carboxyl group
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 #13236)
Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
An organic compound containing 40.1% carbon and 6.6% hydrogen has an empirical formula of?
A
C2H4O2
B
C2H3O2
C
CH2O
D
CH3O
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Carbon Hydrogen
40.1..........................6.67
(3.342) / (3.342).............(6.67) / (3.342)
1 1.9958
1 Ω 2
CH2O
Source: Myschool Past Questions Archive (Record #13237)
Chemistry
UTME / JAMB 1992
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The characteristics reaction of carbonyl compounds is?
A
substitution
B
elimination
C
addition
D
saponfication
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 #13238)
Chemistry
UTME / JAMB 1992
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Alkanals can be differentiated from alkanones by reaction with?
A
2,4-dinitrophenylhydrazine
B
hydrogen cyanide
C
sodium hydrogen sulphite
D
Tollen's reagent
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 #13300)
Chemistry
UTME / JAMB 1992
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
An example of a polysaccharides is?
A
—dextrose
B
mannose
C
glucose
D
starch
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 #13301)
Chemistry
UTME / JAMB 1992
Atomic Structure, Orbitals & Nuclear Chemistry
The nucleus of the isotopes tritium,contains
A
two neutrons with no protons
B
one neutron and one proton
C
two neutrons and one proton
D
two neutrons, one proton and one electron
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: Official Exam / Past Question Archive