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Chemistry
UTME / JAMB 1983
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
\(Zn + H_2 SO_4 → ZnSO_4 + H_2\)
in the above reaction, how much zinc will be left undissolved if 2.00g of zinc is treated with 10cm^3 of 1.0 M of \(H_2SO_4\)?
[Zn =65, s = 32, O = 16, H = 1]
A
1.35g
B
1.00g
C
0.70g
D
0.65g
E
0.00g
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
\(Zn + H_2 SO_4 → ZnSO_4 + H_2\)
1 mole of Zn = 1 mole \(H_2SO_4\)
no of moles of \(H_2SO_4\) = C X V = 1 X 10/1000 = 0.01moles.
0.01mole \(H_2SO_4\) = 0.01 mole Zn
mass of Zn = 0.01 x 65(given) = 0.65g
therefore, the mass of undissolved Zn = 2.00(given) - 0.65 = 1.35g.
Source: Myschool Past Questions Archive (Record #30897)
Chemistry
UTME / JAMB 1983
Stoichiometry, Mole Concept & Volumetric Analysis
30 cm3 of 0.1 M Al (NO3)3 SOLUTION IS RECTED WITH 100cm3 of 0.15M of NaOH solution. Which reactant is in excess, and by now much ?
A
NaOH solution by 70 cm3
B
NaOH solution, by 60 cm3
C
NaOH solution by 40 cm3
D
Al(NO3)3 solution by 20 cm3
E
Al(NO3)3 solution by 10 cm3
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 #30899)
Chemistry
UTME / JAMB 1983
Electrolysis & Electrochemical Cells
Solution
In the experiment above, a current was passed for 10 minutes, and 0.63g of copper was found to be deposited on the cathode of CuSO4 cells. The weight of silver deposited on the cathode of AgNO3 cell during the same period would be? [Cu = 63, Ag = 108]
A
0.54g
B
1.08g
C
1.62g
D
2.16g
E
3.24g
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Same period, Same current
\(Cu^{2+} + 2e^- → Cu; 2Ag^+ + 2e^-\) → Ag
From the equation above, 2 mol Ag ≡ 1 mol Cu
But 0.63g Cu = \(\frac{0.63}{63}\) = 0.01mole Cu
Hence 0.002 mole Ag is deposited
mass of Ag deposited = 0.002 x 108 = 2.16g.
Source: Official Exam / Past Question Archive
Chemistry
UTME / JAMB 1983
Acids, Bases, pH & Salts
Diagram
Solution
In the above experiment, the litmus paper will initially
Attached Figure / Diagram
A
be bleached
B
turn green
C
turn red
D
turn blue
E
turn black
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
When ammonium chloride is heated, it decomposes into ammonia (NH\(_3\)) and hydrogen chloride (HCl) gas, causing damp neutral or red litmus paper to initially turn blue. This happens because the lighter ammonia gas diffuses faster and reaches the damp paper first, dissolving to form an alkaline solution.
Source: Myschool Past Questions Archive (Record #44485)
Chemistry
UTME / JAMB 1983
Electrolysis & Electrochemical Cells
Diagram
Solution
In the experiment above, a current was passed for 10 minutes, and 0.63g of copper was found to be deposited on the cathode of CuSO4 cells. The weight of silver deposited on the cathode of AgNO3 cell during the same period would be? [Cu = 63, Ag = 108]
Attached Figure / Diagram
A
0.54g
B
1.08g
C
1.62g
D
2.16g
E
3.24g
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Same period, Same current
\(Cu^{2+} + 2e^- → Cu; 2Ag^+ + 2e^-\) → Ag
From the equation above, 2 mol Ag ≡ 1 mol Cu
But 0.63g Cu = \(\frac{0.63}{63}\) = 0.01mole Cu
Hence 0.002 mole Ag is deposited
mass of Ag deposited = 0.002 x 108 = 2.16g.
Source: Myschool Past Questions Archive (Record #44486)
English Language
UTME / JAMB 1983
Lexis, Structure & Register (Cloze & Vocabulary)
The speaker's mother considered that
A
things were not as good as they use to be
B
women were foolish
C
the world was corrupt
D
the love of money was the root of all evil
E
it was necessary for attitudes to change
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Official Exam / Past Question Archive
Biology
UTME / JAMB 1983
Variety of Organisms & Classification of Living Things
Root hairs are developed from the
A
root apex
B
epidermis of root
C
vascular bundles
D
endodermis
E
pericycle
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 #2376)
Biology
UTME / JAMB 1983
Cell Structure, Organization & Cell Division
In a dicot leaf, guard cells differ from other epidermal cells because they
A
have no definite shape
B
lack nuclei
C
are smaller
D
contain chloroplast
E
lack vacuole
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 #2377)
Biology
UTME / JAMB 1983
Variety of Organisms & Classification of Living Things
Which of the following structure is NOT found in the female agama lizard?
A
Pre-anal pads
B
Eardrum
C
Gular fold
D
Nasal scale
E
Nuchal crest
medium Difficulty
Verified Correct Answer: Option E
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #2378)
Biology
UTME / JAMB 1983
Variety of Organisms & Classification of Living Things
Herbs differ from shrubs because they
A
do not produce fruit
B
are useful to herbalist
C
do not become woody
D
are only annual
E
are only perennials
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 #2379)
Biology
UTME / JAMB 1983
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Solution
If an organic compound has its hydrogen: oxygen ratio as 2:1, it is likely to be
A
a protein
B
a cabohydrate
C
a fat
D
a fatty acid and glycerol
E
an amino acid
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Carbohydrates have the general chemical formula C\(_n\)(H\(_2\)O)\(_m\). This molecular layout gives them a fixed hydrogen-to-oxygen ratio of 2:1, identical to water. For example, glucose (C\(_6\)H\(_{12}\)O\(_6\)) has 12 hydrogen atoms and 6 oxygen atoms, which simplifies perfectly to a 2:1 ratio.
Source: Myschool Past Questions Archive (Record #2381)
Biology
UTME / JAMB 1983
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Which of the following elements are necessary for the formation of chlorophyll in a plant?
A
magnesium and iron
B
Calcium and potassium
C
Calcium and sulphur
D
Potasium and sulphur
E
Phosphorus and potassium
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 #2382)
Biology
UTME / JAMB 1983
Transport System in Plants & Animals
Which of the following statements is NOT true of mammalian erythrocytes?
A
They have haemoglobin
B
they appear yellow when looked at singly
C
They are disc shaped
D
The cell are more numerous than leucocytes
E
They have nuclei at maturity
medium Difficulty
Verified Correct Answer: Option E
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #2383)
Biology
UTME / JAMB 1983
Supporting Tissues & Skeletal System
Solution
In woody plants, grass and water vapour are transported across the stems by the
A
xylem fibres
B
medullary rays
C
sieve tubes
D
phloem fibres
E
phloem parenchyma
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
In woody plants, medullary rays (also known as vascular rays or pith rays) are responsible for the radial (transverse) transport of substances across the stem. While xylem and phloem primarily handle vertical (longitudinal) transport, medullary rays facilitate the lateral movement of water, nutrients, and gases (such as water vapor) between the inner and outer layers of the stem, extending from the pith to the cortex.
Source: Myschool Past Questions Archive (Record #2384)
Biology
UTME / JAMB 1983
Variety of Organisms & Classification of Living Things
Which of the following substance is not found in urine?
A
Water
B
Sodium chloride
C
Nitrogenous compounds
D
Calcium chloride
E
Nitrogenous salts
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 #2385)