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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
Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
Solution
In the experiment above. Z can be
Attached Figure / Diagram
A
a solution of sodium dioxonitrate (lll) and ammonium chloride
B
a solution of lead trioxnitrate (V)
C
a solution of sodium trioxonitrate (V) and ammonium chloride
D
concentrated tetraoxosulphate (VI) acid and sodium trioxonitrate (V)
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Nitrogen(I) oxide(laughing gas) can be prepared in the laboratory by the action of heat on a mixture of sodium trioxonitrate (V) and ammonium chloride, this colourless gas is collected over water.
Source: Myschool Past Questions Archive (Record #31456)
Chemistry
UTME / JAMB 1992
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Diagram
Solution
Which of the following compounds is a secondary alkanol?
Attached Figure / Diagram
A
A
B
B
C
C
D
D
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Alkanols with two alkyl groups attached to the carbon atom carrying the hydroxyl group (-OH) is called secondary alkanol.
Source: Myschool Past Questions Archive (Record #31459)
Chemistry
WAEC / WASSCE 1992
Non-Metals & Their Compounds
Solution
When steam is passed over white-hot coke, the products are
A
carbon (IV) oxide and nitrogen
B
carbon (II) oxide and hydrogen
C
carbon (ll) oxide and nitrogen
D
carbon (lV) oxide and steam
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Reaction:
C (white hot coke) + H\(_2\)O (steam) → CO + H\(_2\).
Source: Myschool Past Questions Archive (Record #36173)
Chemistry
WAEC / WASSCE 1992
Atomic Structure, Orbitals & Nuclear Chemistry
The maximum number of electrons that can accommodated in the shell having the principal quantum number 3 is
A
3
B
9
C
10
D
18
E
32
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 #36174)
Chemistry
WAEC / WASSCE 1992
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Methanol is obtained from wood by
A
esterification
B
bacterial decomposition
C
combustion
D
fractional distillation
E
destructive distillation
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 #36175)