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Chemistry
UTME / JAMB 1990
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
Use the graph above to answer this question. The structure of cis-2-butene is
Attached Figure / Diagram
A
A
B
B
C
C
D
D
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 #31439)
Chemistry
UTME / JAMB 1990
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
Solution
What is the IUPAC name for the hydrocarbon?
Attached Figure / Diagram
A
2-ethyl-4-methylpent-2-ene
B
3,5-dimethylhex-3-ene
C
2,4-dimethylhex 3-ene
D
2-methyl-4-ethylpent-3-ene
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The longest chain is not always the straight chain. For this compound, the longest chain is 6, which means hex... with the double bond on Carbon-3, counting from right to left, or from left to right, either way, the double bond is on C3 so the parent name will be hex-3-ene. For the substituents, we have two methyl groups (-CH3), counting from R-L, on C2 & C4. Counting from L-R will be on C3 & C5. However, since C2&C4 tends to be the shorter route, following the rule, the name of the compound is 2,4- dimethylhex-3-ene. The correct answer is option C.
Source: Myschool Past Questions Archive (Record #31440)
Chemistry
UTME / JAMB 1990
Oxidation, Reduction & Redox Reactions
Diagram
Solution
CH3-C = CH \(\frac{Na}{liq NH_3}\)> P, Compound P, in the above reaction, is
Attached Figure / Diagram
A
A
B
B
C
C
D
D
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
When propyne (methylacetylene) reacts in the presence of sodium (Na) and liquid ammonia (NH₃), it undergoes a reduction reaction.
Propyne (CH₃C≡CH) is reduced to form propene (CH₃CH=CH₂) through the trans addition of hydrogen.
During the reaction, the sodium (Na) dissolves in the liquid ammonia (NH₃) to form a blue-colored solution of solvated electrons, which act as a reducing agent. The sodium is oxidized, releasing electrons that are then used to reduce the propyne. The ammonia acts as a solvent and helps to stabilize the solvated electrons.
So, the sodium is essentially consumed during the reaction, and the ammonia acts as a catalyst or solvent, helping to facilitate the reduction reaction.
The sodium (Na) and ammonia (NH₃) don't interfere with the product formed, which is propene (CH₃CH=CH₂), rather they play a role in facilitating the reaction, but they don't become part of the final product. The sodium is consumed during the reaction, and the ammonia can be recovered or removed, leaving behind the desired product, propene.
Source: Myschool Past Questions Archive (Record #31442)
Chemistry
UTME / JAMB 1990
Acids, Bases, pH & Salts
Diagram
The above reaction is an example of
Attached Figure / Diagram
A
a displacement reaction
B
a neutralization reaction
C
an elimination reaction
D
saponification
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 #31443)
Chemistry
UTME / JAMB 1990
Organic Chemistry I: Hydrocarbons & Crude Oil
Diagram
Select the right answer from the structure above.Which of the following compounds represents the polymerization product of ethyne?
Attached Figure / Diagram
A
A
B
B
C
C
D
D
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 #31444)
Chemistry
UTME / JAMB 1990
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The Avogadro number of 24g of magnesium is the same as that of
A
1g of hydrogen molecules
B
16g of oxygen molecules
C
32g of oxygen molecules
D
35.5g of chlorine molecules
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
24mg = 1 mole of magnesium and
32g of O2 = mole of O2
Source: Myschool Past Questions Archive (Record #44453)
English Language
UTME / JAMB 1990
Lexis, Structure & Register (Cloze & Vocabulary)
The problem of selection in the book trade involves
A
holding a stock large enough for the public to choose from
B
determing which books will sell fast
C
being a sales representative of large publishing houses
D
being able to review the lastest publications
E
more than three codes but only two used for education
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Official Exam / Past Question Archive
Biology
UTME / JAMB 1990
Variety of Organisms & Classification of Living Things
Viruses are considered to be living organisms because they
A
possess transmittable characters
B
move from one place to another
C
respond to stimulation
D
ingest food materials
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #4402)
Biology
UTME / JAMB 1990
Variety of Organisms & Classification of Living Things
Which of the following characteristics is common to Amoeba and Paramecium?
A
Oral groove
B
Trichocyst
C
Contractile vacuole
D
Cilia
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 #4403)
Biology
UTME / JAMB 1990
Variety of Organisms & Classification of Living Things
Hydra removes undigested food by
A
passing it through the anus
B
passing it through the mouth
C
means of a contractile vacuole
D
egesting it through the body surface
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #4404)
Biology
UTME / JAMB 1990
Variety of Organisms & Classification of Living Things
Which of the following groups of invertebrates reproduces by budding?
A
Arthropoda
B
Annelides
C
Mollusces
D
Coelenterata
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 #4405)
Biology
UTME / JAMB 1990
Reproduction in Plants & Animals
In which of the following does external fertilization takes place?
A
Toad
B
Lizard
C
Bird
D
Cockcroach
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #4511)
Biology
UTME / JAMB 1990
Variety of Organisms & Classification of Living Things
In the tapeworm the suckers on the scolex are used for
A
sucking the blood of the host
B
holding fast to the host
C
reproduction
D
locomotion
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #4512)
Biology
UTME / JAMB 1990
Adaptation & Evolution
Solution
A feature which adapts birds to flight is the possession of
A
scaly legs
B
light bones
C
two walking legs
D
a pointed beak
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Birds have several adaptations that contribute to their ability to fly, including a lightweight body with hollow bones, specialized feathers for lift and control, a streamlined body shape, a high metabolism, powerful muscles, an efficient respiratory system, a keel for structural support
Source: Myschool Past Questions Archive (Record #4513)
Biology
UTME / JAMB 1990
Excretion & Homeostasis
The nephridia in the earthworm form part of the
A
reproductive system
B
respiratory system
C
circulatory system
D
excretory system
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 #4514)