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Chemistry
UTME / JAMB 2023
Organic Chemistry
Solution
What is the IUPAC name for the compound CCl\(_4\)?
A
Tetrahydrochloride
B
Tetrachloromethane
C
Carbon tetrachloride
D
Chloroform
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The compound CCl\(_4\) is a chlorinated hydrocarbon with a central carbon atom and four chlorine atoms attached to it. According to IUPAC rules, the correct name for this compound is "tetrachloromethane."
Source: Myschool Past Questions Archive (Record #67535)
Chemistry
UTME / JAMB 2023
Stoichiometry & Mole Concept
Solution
Which of the following statements is true regarding the melting and boiling points of pure substances?
A
The boiling point is always higher than the melting point
B
The melting point is always higher than the boiling point
C
The melting and boiling points are always the same for all substances
D
The melting and boiling points can vary depending on the substance
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
The melting and boiling points are specific physical properties of each substance and can vary depending on the nature of the substance. Different substances have different melting and boiling points, which are determined by the strength of the intermolecular forces and the molecular structure of the substance.
Source: Myschool Past Questions Archive (Record #67536)
Chemistry
UTME / JAMB 2023
Atomic Structure and Periodic Table
Solution
An element has an atomic number of 8 and a mass number of 16. How many neutrons does this element have?
A
24
B
16
C
8
D
32
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The atomic number of an element is equal to the number of protons, which in this case is 8. The mass number is the total number of protons and neutrons, which is 16. To find the number of neutrons, we subtract the atomic number from the mass number:
Number of neutrons = Mass number - Atomic number
Number of neutrons = 16 - 8
Number of neutrons = 8
So, the element has 8 neutrons.
Source: Myschool Past Questions Archive (Record #67538)
Chemistry
UTME / JAMB 2023
Matter & Separation Techniques
Solution
Which of the following statements is true for strong electrolytes?
A
They do not conduct electricity in the molten state
B
They completely dissociate into ions in solution
C
They are non-polar substances
D
They partially dissociate into ions in solution
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
They completely dissociate into ions in solution. Strong electrolytes are substances that fully dissociate into ions when dissolved in water or melted. As a result, they produce a high concentration of ions in the solution, allowing for efficient electrical conductivity.
Source: Myschool Past Questions Archive (Record #67540)
Chemistry
UTME / JAMB 2023
Atomic Structure and Periodic Table
Solution
What is the maximum number of electrons that can occupy the second energy level (n=2)?
A
2 electrons
B
18 electrons
C
8 electrons
D
32 electrons
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The correct answer is (b). The second energy level (n=2) can hold a maximum of 8 electrons. It consists of two subshells, 2s and 2p, which can hold 2 and 6 electrons, respectively.
Source: Myschool Past Questions Archive (Record #67542)
Chemistry
UTME / JAMB 2023
Acids, Bases, and Salts
Solution
Which of the following is a common laboratory indicator for bases?
A
Methyl orange
B
Phenolphthalein
C
Bromothymol blue
D
Litmus
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Phenolphthalein is a common laboratory indicator used to detect the presence of bases in a solution. In its basic form (pH > 8.3), it turns pink or purple, indicating the presence of a base.
Source: Myschool Past Questions Archive (Record #67544)
Chemistry
UTME / JAMB 2023
Matter & Separation Techniques
Solution
Which of the following is a common laboratory indicator for bases?
A
Methyl orange
B
Phenolphthalein
C
Bromothymol blue
D
Litmus
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Phenolphthalein is a common laboratory indicator used to detect the presence of bases in a solution. In its basic form (pH > 8.3), it turns pink or purple, indicating the presence of a base.
Source: Official Exam / Past Question Archive
English Language
UTME / JAMB 2023
English Grammar
Solution
Choose the word that has the same rhyme scheme as the following word:
battle
A
raffle
B
latter
C
bitter
D
kettle
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
battle - /ˈbæt.əl/
raffle - /'ræf.əl/
latter - /'læt.ə/
bitter - /ˈbɪt.ə/
kettle - /'ket.əl/
Battle and kettle have the same rhyme scheme because they both end with the syllable /təl/.
Source: Myschool Past Questions Archive (Record #67285)
English Language
UTME / JAMB 2023
English Grammar
Solution
The words in capital letter have the emphatic stress. Choose the options to which the given sentences relate.
I bought my WIFE a red dress
A
Did I buy my husband a red dress?
B
Did I buy my wife a red shoe?
C
Did he buy my wife a red dress?
D
Did I buy my wife a black dress?
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
Emphatic stress is the placement of greater stress on a particular word in a phrase or sentence. In this case, the word wife is emphasized to correct a mistake that has been made in the question. To find the appropriate question to the response: I bought my WIFE a new dress, you have to find the question that has a word that is different from the emphasized word/ the word in capital letters. The correct question is
A. Did I buy my husband a new dress?
No. I bought my WIFE a new dress.
Source: Myschool Past Questions Archive (Record #67287)
English Language
UTME / JAMB 2023
English Grammar
Solution
This question is based on "The Life Changer" novel.
Dr. Samuel Johnson is also known as_____
A
SamJson
B
Samjohn
C
all of the above
D
Johnsam
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
He is also known as Samjohn. We can find this in pg. 19 of the novel where Ummi's husband casually refers to Dr Samuel Johnson as Dr. Samjohn, his friend who had helped with Ummi's admission.
Source: Myschool Past Questions Archive (Record #67288)
English Language
UTME / JAMB 2023
English Grammar
Solution
Choose the word that has the same CONSONANT SOUND as the one represented by the letter(s) underlined.
wash
A
treasure
B
occasion
C
nation
D
equation
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
wash - /ʃ/
treasure - /ʒ/
occasion - /ʒ/
nation - /ʃ/
equation - /ʒ/
Source: Myschool Past Questions Archive (Record #67289)
English Language
UTME / JAMB 2023
English Grammar
Solution
In each of the following sentences, the word that resolves the emphatic stress is written in capital letters. From the options letters A to D, choose the one to which the given sentence is the appropriate answer.
Daddy plays TENNIS on Saturday afternoons
A
Does mummy play tennis on Saturday afternoons?
B
Does daddy play tennis on Sunday afternoons?
C
Does daddy play tennis on Saturday morning?
D
Does daddy play cricket on Saturday afternoon?
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
Emphatic stress is the placement of greater stress on a particular word in a phrase or sentence. In this case, the word wife is emphasized to correct a mistake that has been made in the question. To find the appropriate question to the response: Daddy plays TENNIS on Saturday afternoons, you have to find the question that has a word that is different from the emphasized word/ the word in capital letters. The correct question is:
D. Does Daddy play cricket on Saturday afternoon?
No. Daddy plays TENNIS on Saturday afternoon.
Source: Myschool Past Questions Archive (Record #67290)
English Language
UTME / JAMB 2023
English Grammar
Solution
Choose the word or group of words that is most nearly opposite in meaning to the underlined words
The gradual process of transition to civilian rule came to an _____ end.
A
unhappy
B
unnecessary
C
abrupt
D
anticipated
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
The word 'gradual' means taking place or progressing slowly or by degrees. Therefore, the word 'abrupt' which means sudden and unexpected is the opposite of 'gradual'.
Source: Myschool Past Questions Archive (Record #67297)
English Language
UTME / JAMB 2023
English Grammar
Solution
Fill in the gap in the sentence below with the appropriate option:
Peter and Jane love each other ...... the difficulties they face.
A
therefore
B
despite
C
however
D
besides
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
"despite" is used to join two contrasting situations in a sentence. e.g He was rich despite the difficulties he went through.
Source: Myschool Past Questions Archive (Record #67299)
English Language
UTME / JAMB 2023
English Grammar
Solution
Choose the option that is nearest in meaning to the underlined word
I was skeptical about the story she told me.
A
doubtful
B
convinced
C
ignorant
D
confused
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
The word 'skeptical' means not easily convinced; or having doubts or reservations. Therefore, the nearest meaning to 'skeptical' among the options is 'doubtful'.
Source: Myschool Past Questions Archive (Record #67300)