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Physics
UTME / JAMB 1993
Electrostatics & Capacitors
Diagram
Solution
In the network shown above, determine the potential difference across the 5µF capacitor
Attached Figure / Diagram
A
3V
B
6V
C
12V
D
18V
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
For capacitors in series
C\(_{\text{eq}} = \frac{C_1 C_2}{C_1 + C_2}\)
C\(_{\text{eq}} = \frac{5 \times 15}{5 + 15} = \frac{75}{20}\) = 3.75\muF
Charge on the series branch
Q = Ceq \times V =3.75 \times 24 = 90 \muC.
Potential difference across the 5 µF capacitor
V\(_{5} = \frac{Q}{C} = \frac{90}{5}\) = 18 V
Source: Myschool Past Questions Archive (Record #41720)
Physics
UTME / JAMB 1993
Gas Laws & Heat Transfer
The kinetic theory of photoelectron liberated from a metallic surface depends on the
A
intensity of the incident radiation
B
time duration of the incident radiation
C
temperature of the incident radiation
D
frequency of the incident radiation
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #28029)
Chemistry
UTME / JAMB 1993
Particulate Nature of Matter, Laws & Formulae
A balanced chemical equation obeys the law of?
A
conservation of mass
B
difinite proportions
C
multiple proportions
D
conservation of energy
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 #13303)
Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
How many moles of oxygen molecules would be produced from the decomposition of 2.50 moles of potassium trioxochlorate (V)?
A
2.50
B
3.50
C
3.75
D
7.50
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
2KClO3(s) → 2KCl(s) + 3O2(g)
From the above balanced equation, 2 moles of reactant decomposed to give 3 moles of O2 i.e.
i mole of reactant will produce (3)/(2) moles O2.
∴ 2.5 moles KClO3 will give
= 3.75 moles
Source: Myschool Past Questions Archive (Record #13304)
Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
For iodine crystals to sublime on heating, the molecules must acquire energy that is?
A
less than the forces odf attraction in the solid
B
equal to the forces of attraction in th solid
C
necessary to melt the solid
D
greater than the forces of attraction in both the solid and the liquid phases
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 #13305)
Chemistry
UTME / JAMB 1993
Atomic Structure, Orbitals & Nuclear Chemistry
An element, E, has the electronic configuration 1s22s22p63s2p3. The reaction of E with a halogen X can give?
A
EX3 and EX5
B
EX3 only
C
EX5 only
D
EX2 and EX3
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 #13306)
Chemistry
UTME / JAMB 1993
Atomic Structure, Orbitals & Nuclear Chemistry
Two atoms represented as U and U are?
A
isomers
B
allotropes
C
isotopes
D
anomers
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 #13307)
Chemistry
UTME / JAMB 1993
Periodic Table & Periodicity
Solution
As the difference in electronegativity between bonded atoms increases, polarity of the bond?
A
decreases
B
increases
C
remains unchanged
D
reduces to zero
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Topic is Chemical Bonding
Source: Myschool Past Questions Archive (Record #13308)
Chemistry
UTME / JAMB 1993
Periodic Table & Periodicity
Solution
Which group of elements forms hydrides that are pyramidal in structure?
A
III
B
IV
C
V
D
VI
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Group V elements (also known as pnictogens) form hydrides that are pyramidal in structure. The trihydrides, such as NH\(_3\) (ammonia), PH\(_3\) (phosphine), AsH\(_3\) (arsine), and SbH\(_3\) (stibine), all exhibit a pyramidal shape.
Source: Myschool Past Questions Archive (Record #13309)
Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Water has a rather high boiling point despite its low molecular mass because of the presence of?
A
hydrogen bonding
B
covalent bonding
C
ionic bonding
D
metallic bonding
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 #13310)
Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Argon is used in gas-filled electric lamp because it helps to?
A
prevent the reduction of the lamp fillaments
B
prevent oxidation of the lamp fillaments
C
make the lamp fillament glow brightly
D
keep the atmosphere in the lamp inert
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Argon is used to fill incandescent and fluorescent light bulbs to prevent oxygen from corroding the hot filament.
Source: Myschool Past Questions Archive (Record #13311)
Chemistry
UTME / JAMB 1993
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
The air around a petroleum refinery is most likely to contain?
A
CO2, SO3 and N2O
B
CO2, CO and N2O
C
SO2, CO and NO2
D
PH3 H2O and CO2
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Topic is Impurities of Crude-oil
Source: Myschool Past Questions Archive (Record #13312)
Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Water can be identified by the use of?
A
anhydrous copper (II) tetraoxosulphate (VI)
B
anhydrous sodium trioxocarbonate (IV)
C
potassium heptaoxochromate (VII)
D
copper (II) trioxocaronate (IV)
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Anhydrous CuSO4 will turn blue with water
Source: Myschool Past Questions Archive (Record #13326)
Chemistry
UTME / JAMB 1993
Water, Solutions & Solubility
Solution
The phenomenon whereby sodium trioxocarbonate (IV) decahydrate loses some of its water of crystallization on exposure to the atmosphere is known as?
A
deliquescene
B
hygroscopy
C
effervescence
D
efflorescence
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Topic is Salts With Water of Crystallization.
Source: Myschool Past Questions Archive (Record #13328)
Chemistry
UTME / JAMB 1993
Acids, Bases, pH & Salts
Solution
A student prepares 0.5 M solution each of hydrochloric and ethanoic acids and then measured pH. The result would show that the?
A
pH values are equal
B
HCI solution has a higher pH
C
sum of the values is 14
D
ethanoic acid solution has a higher pH
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
A weak acid would have a higher pH value than a strong acid at the same concentration. Strong acids dissociate completely in water, releasing more hydrogen ions (H\(^+\) and thus having a lower pH (more acidic). Weak acids only partially dissociate, resulting in fewer H\(^+\) ions and a higher pH (less acidic).
HCl is a strong acid because it dissociates completely when dissolved in water, thereby releasing more hydrogen ions and thus having a lower pH value when compared to ethanoic acid, a weak acid which dissociates partially when dissolved in water, thereby releasing less hydrogen ions, invariably having a higher pH, regardless of the fact that both acids have the same concentration of 0.5M.
Source: Myschool Past Questions Archive (Record #13331)