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Chemistry
UTME / JAMB 2002
Periodic Table & Periodicity
Solution
Which of the following chloride would exhibit the least ionic character?
A
MgCl2
B
CaCl2
C
LiCl
D
AlCl3
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Though all the salts in the options are chloride salts but the focus should be on the Metals that formed the chlorides. In terms of reactivity, Group I metals(Li) are the most reactive, followed by Group II(Mg and Ca) and then group III (Al). Therefore, AlCl\(_3\) would exhibit the least ionic character, as the ionic bond formed is not as strong as those found in other options.
Also, most importantly, according to Fajan's Rule, the greater the charge on the cation, the greater will be the covalent character in the bond. Since, LiCl has low charge on cation(Li+), it has the most ionic character, while AlCl\(_3\) has a very high charge on Cation Al\(^{3+}\), it will exhibit the least ionic character.
Source: Myschool Past Questions Archive (Record #2147)
Chemistry
UTME / JAMB 2002
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
A fixed mass of gas has a volume of 92\(cm^3\) at 3ºC. What will be its volume at 18ºC if the pressure remains constant?
A
15.3cm3
B
87.3cm3
C
552.0cm3
D
97.0cm3
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
According to Charle's law,
\(\frac{V_1}{T_1}\) =\(\frac{V_2}{T_2}\)
T\(_1\) = 3+273 = 276K and T\(_2\) = 18 + 273 = 291K
∴ \(\frac{92}{276}\) = \(\frac{V_2}{291}\)
V\(_2\) = \(\frac{92}{291}\) X 276
= 97.0\(cm^3\)
Source: Myschool Past Questions Archive (Record #2148)
Chemistry
UTME / JAMB 2002
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The processes which return carbon (IV) oxide to the atmosphere include
A
respiration, decay and combustion
B
photosynthesis, respiration and transpiration
C
ozone depletion, combustion and decay
D
photosynthesis, decay and respiration
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Carbon(IV) oxide is returned to the atmosphere through various processes including combustion( Burning fossil fuels, wood, or gasoline releases carbon dioxide into the atmosphere), respiration (All living organisms, including plants and animals, release carbon dioxide when they breathe. This process is also known as cellular respiration), and decay(when organisms die, the process of decomposition breaks down complex carbon compounds into simpler ones. This process releases CO\(_2\) into the atmosphere).
Conversely,Photosynthesis is a process that removes CO\(_2\) from the atmosphere and uses it to create carbohydrates and oxygen.
Source: Myschool Past Questions Archive (Record #2149)
Chemistry
UTME / JAMB 2002
Particulate Nature of Matter, Laws & Formulae
Solution
The postulate of Dalton's atomic theory which still holds is that
A
atoms can neither be created nor destroyed
B
the particles of the same element are exactly alike
C
particles of different elements combine in simple whole number ratio
D
all elemets are made of small indivisible particles
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Two postulates of Dalton's atomic theory that are still considered correct today are:
Atoms of different elements have different masses and properties: This is considered the most fundamental and important postulate.
Matter is neither created nor destroyed in a chemical reaction: This postulate reflects the Law of Conservation of Mass.
Atom of an element cannot be created, divided, destroyed, or split into smaller particles or transformed into atoms of other elements or transformed into other atoms in a chemical reaction. They are simply rearrangement of new compound. Dalton’s atomic theory based this hypothesis on the law of conservation of mass and on centuries of experimental evidence.
Source: Myschool Past Questions Archive (Record #2150)
Chemistry
UTME / JAMB 2002
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
\(^{14}\) \(_6\)C → X + \beta
X in the equation above represents
A
126C
B
125B
C
147N
D
136C
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
146C → X + \beta
→ X + 0-1e
→ 147X
Source: Myschool Past Questions Archive (Record #2151)
Chemistry
UTME / JAMB 2002
Kinetic Theory of Matter & Gas Laws
Solution
If 0.75 mole of cyclopropane and 0.66 mole of oxygen are mixed in vessel with a total pressure of 0.7 atmosphere, what is the partial pressure of oxygen in the mixture
A
0.44 atmosphere
B
0.22 atmosphere
C
0.55 atmosphere
D
0.33 atmosphere
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Parameters given:
Number of moles of Cyclopropane, N\(_c\) = 0.75 mole
Number of moles of Oxygen, N\(_o\) = 0.66 mole
Total pressure of mixture of gases, P\(_T\) = 0.70 atm
Partial pressure of Oxygen in the mixture, P\(_O\) = ?
Using the formula, P\(_O\) = \(\frac{N_o}{{N_o} + {N_c}}\) X P\(_T\)
= \(\frac{0.66}{{0.66} + {0.75}}\) X 0.70
= \(\frac{0.66}{1.41}\) X 0.70
= 0.3276
= 0.33 atm
Source: Myschool Past Questions Archive (Record #2152)
Chemistry
UTME / JAMB 2002
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
The compound above is
A
glycol
B
primary alkanol
C
secondary alkanol
D
tertiary alkanol
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
A secondary alcohol is an organic compound where a hydroxyl group (-OH) is attached to a carbon atom that is bonded to two other carbon atoms.
Source: Official Exam / Past Question Archive
English Language
WAEC / WASSCE 2002
Antonyms (Opposite in Meaning)
In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
The workers expected management to be...........rather than indifferent to, their welfare.
A
different from
B
interested in
C
opposed to
D
careful of
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: Myschool Past Questions Archive (Record #24902)
English Language
WAEC / WASSCE 2002
Antonyms (Opposite in Meaning)
In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
Words spoken in the heat of an argument could offend rather than...............
A
pacify
B
amuse
C
inspire
D
irritate
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #24903)
English Language
WAEC / WASSCE 2002
Antonyms (Opposite in Meaning)
In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
Although they have declared the student a suspect he may turn out be ...........
A
culpable
B
innocent
C
safe
D
ignorant
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: Myschool Past Questions Archive (Record #24904)
English Language
WAEC / WASSCE 2002
Antonyms (Opposite in Meaning)
In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
Some outspoken social critics live a........... family life
A
reserved
B
happy
C
boisterous
D
still
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #24905)
English Language
WAEC / WASSCE 2002
Antonyms (Opposite in Meaning)
In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
While the manager was prudent in his expenditure, his deputy was..........
A
miserly
B
careful
C
thoughtfull
D
extravagant
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: Myschool Past Questions Archive (Record #24906)
English Language
WAEC / WASSCE 2002
Antonyms (Opposite in Meaning)
In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
The cultured and the..........are known by their conduct
A
barbaric
B
ignorant
C
clean
D
lazzy
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #24907)
English Language
WAEC / WASSCE 2002
Antonyms (Opposite in Meaning)
In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
Tunde seldom asks questions in class and was..................very careful when he did
A
hardly
B
sometimes
C
often
D
never
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #24908)
English Language
WAEC / WASSCE 2002
Concord (Subject-Verb Agreement)
From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences:
Tests revealed that the winning athlete had taken performance-enhancing.................
A
drugs
B
tablets
C
vitamins
D
capsules
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #24909)