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Chemistry
UTME / JAMB 2008
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formular?
A
C2H2
B
C3H3
C
C4H4
D
C5H5
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
% of H2 = 100 - 92.3 = 7.7%
mole = Carbon [92.3 / 12] = 7.7
Hydrogen [7.7 / 1] = 7.7
divide with the lowest:
Carbon - 7.1 / 7.1 = 1
Hydrogen - 7.1 / 7.1 = 1
empirical formula = CH
(CH)n = 26
(12 + 1)n = 26
(13)n = 26
n = 26/13 = 2
molecular formula = C\(_2\)H\(_2\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #4255)
Chemistry
UTME / JAMB 2008
Acids, Bases, pH & Salts
Solution
Insoluble salts can be prepared by?
A
titrating an alkali against an appropriate acid
B
reacting an acid with trioxocarbonate (IV) salt
C
directing combination of the elements which make up the salt
D
mixing two soluble compounds containing the metallic radical and the acidic radical
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
An insoluble salt can be prepared by a precipitation method through a double decomposition reaction.
Two soluble metal salts react with each other to form one soluble salt and one insoluble salt .
Lead nitrate solution and sodium chloride solution react to produce solid lead chloride , leaving soluble sodium nitrate in solution.
The lead chloride can be recovered by filtration.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4047)
Chemistry
UTME / JAMB 2008
Water, Solutions & Solubility
Solution
In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove?
A
large particles
B
germs
C
fine particles
D
odour
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Potash alum [kAl(S\({O}_4\))\(_2\)] n sodium aluminate (ii) (NaHCO\(_2\)) are added to cause coagulation.
As fine particles to clump together, forming large particles heavy enough to settle at the bottom of the tanks as impurities.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4031)
Mathematics
UTME / JAMB 2008
Trigonometry, Elevation & Bearings
Solution
A student sitting on a tower 68 metres high observes his principal's car at the angle of depression of 20o. How far is the car from the bottom of the tower to the nearest metre?
A
184m
B
185m
C
186m
D
187m
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
Tan 20º = \(\frac{68m}{x}\)
x tan 20º = 68
x = \(\frac{68}{tan 20}\) = \(\frac{68}{0.364}\)
x = 186.8
= 187m
Source: Myschool Past Questions Archive (Record #29982)
English Language
UTME / JAMB 2008
Question Tags, Modals & Pronouns
Select the option that best explains the information conveyed in the sentence.
He needn't have bought that table?
A
It isn't possible that he bought the table
B
He bought the table, but it wasn't necessary
C
He didn't buy the table because it wasn,t necessary
D
He doesn't need to buy the table
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 #12305)
English Language
UTME / JAMB 2008
Concord (Subject-Verb Agreement)
Select the option that best explains the information conveyed in the sentence.
It was too cold for him to go out?
A
He had a bad cold, and did not go out
B
Although it was very cold, he still went out
C
As it was very cold, he did not go out
D
He was afraid to go out that day
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 #12309)
English Language
UTME / JAMB 2008
Concord (Subject-Verb Agreement)
Solution
Select the option that best explains the information conveyed in the sentence.
He wants the meeting to be adjourned?
A
He wants the meeeting closed
B
He wants the meeting cancelled
C
He wants the meeting to continue to the next day
D
He wants the meeting to commence another day
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
Option D is the best answer to the question. When a meeting is adjourned it breaks off with the intention of resuming it later.
Source: Myschool Past Questions Archive (Record #12317)
English Language
UTME / JAMB 2008
Concord (Subject-Verb Agreement)
Select the option that best explains the information conveyed in the sentence.
My father is one of the vociferous few challenging the company's appointment of the manager?
A
my father is the one who shouts with a loud voice against the appointment of the manager
B
My father and others speak on behalf of the company against the appointment of the manager
C
My father is one of those objecting to the appointment of the manager
D
My father is agitated by the appointment of the manager
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 #12318)
English Language
UTME / JAMB 2008
Concord (Subject-Verb Agreement)
Solution
Select the option that best explains the information conveyed in the sentence.
In those days in this school, everyone who spoke in a language other than English paid a fine of ten naira?
A
Everyone of us paid a fine of ten naira because we did not always speak in English
B
Everyone would pay a fine of ten naira for wanting to use a language other than English
C
Those who spoke a language other than English on the premises paid a fine of ten naira
D
Those who intended to speak other language on the school premises were required to pay ten naira
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
Option C best explains the information conveyed in the sentence above
Source: Myschool Past Questions Archive (Record #12321)
English Language
UTME / JAMB 2008
Concord (Subject-Verb Agreement)
Solution
Select the option that best explains the information conveyed in the sentence.
The officer has discussed the vexed issue of incessant power failure?
A
In anger the officer explained the problem of constant power failure
B
The officer added his voice to the much discussed problem of power cut
C
The officer's explanations angered those failures who have suffered the effects of frequent power failure
D
The officer told the people not to be angered by the frequent power cut
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
The officer has discussed an issue of which is the problem of ceaseless power failure. Option B conveys this interpretation.
Source: Myschool Past Questions Archive (Record #12322)
English Language
UTME / JAMB 2008
Antonyms (Opposite in Meaning)
Choose the option opposite in meaning to the underlined word.
The weather condition now prevailing in town is unbearable?
A
widespread
B
dominant
C
uncommon
D
unconttrollable
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 #12323)
English Language
UTME / JAMB 2008
Antonyms (Opposite in Meaning)
Solution
Choose the option opposite in meaning to the underlined word.
The lady was completely nonplussed when her suitor rejected her gifts?
A
unpuzzled
B
surprise
C
unconscious
D
disappointed
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
Nonplussed means to be surprised or confused that one is unsure how to react.
Option A is the correct answer.
Source: Myschool Past Questions Archive (Record #12324)
English Language
UTME / JAMB 2008
Antonyms (Opposite in Meaning)
Solution
Choose the option opposite in meaning to the underlined word.
As a public officer, he should act with scrupulous honesty at all times.
A
impeccable
B
careless
C
transparent
D
uncompromising
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
Scrupulous means to be careful, thorough, and extremely attentive to details.
Option B is the correct answer.
Source: Myschool Past Questions Archive (Record #12329)
English Language
UTME / JAMB 2008
Antonyms (Opposite in Meaning)
Solution
Choose the option opposite in meaning to the underlined word.
The condition of the hotels has become deplorable?
A
admirable
B
regrettable
C
bearable
D
malignant
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
deplorable means deserving strong condemnation; completely unacceptable.
Option A is the correct answer
Source: Myschool Past Questions Archive (Record #12330)
English Language
UTME / JAMB 2008
Antonyms (Opposite in Meaning)
Solution
Choose the option opposite in meaning to the underlined word.
Men from the agency went into the market in search of unwholesome food items?
A
imported
B
healthy
C
banned
D
uncooked
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
Unwholesome means not characterized by or conducive to health or moral well-being.
OPtion B is the correct answer.
Source: Myschool Past Questions Archive (Record #12331)