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Chemistry
WAEC / WASSCE 2025
Atomic Structure and Periodic Table
Solution
Five d-orbitals have the same energy level in an isolated transition metal are described as
A
degenerate
B
non-degenerate
C
high level orbital
D
low-level orbital
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
In gaseous ion (one not bonded to any ligands) or an isolated transition metal atom, all five d-orbitals (d\(_{xy}\), d\(_{yz}\), d\(_{xz}\),...) possess the exact same energy level. In quantum chemistry, orbitals that share the same energy are formally defined as degenerate. This symmetry exists because there is no external electric or magnetic field (such as that from approaching ligands) to distinguish the orbitals' orientations relative to one another.
Source: Myschool Past Questions Archive (Record #77160)
Chemistry
WAEC / WASSCE 2025
Acids, Bases, and Salts
Solution
Which of the following oxides is amphoteric?
A
CaO
B
MgO
C
BaO
D
BeO
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Beryllium oxide (BeO) is an amphoteric oxide because it can react with both acids and bases.
Source: Myschool Past Questions Archive (Record #77161)
Chemistry
WAEC / WASSCE 2025
Acids, Bases, and Salts
Solution
The allotrope of carbon used in the decolourization of sugar is
A
charcoal
B
graphite
C
lampblack
D
soot
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Charcoal is an amorphous allotrope of carbon known for its highly porous structure. Specifically, animal charcoal (bone char) or activated carbon is used in the sugar industry to remove colored impurities from raw sugar syrup through a process called adsorption. These impurities are physically trapped on the large surface area of the charcoal particles, resulting in the clear solution needed to produce white refined sugar.
Source: Myschool Past Questions Archive (Record #77162)
Chemistry
WAEC / WASSCE 2025
Atomic Structure and Periodic Table
Solution
In the periodic table, valence electrons are indicated by
A
group number
B
Shell number
C
period number
D
atomic mass
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
In the periodic table, the group number (the vertical column) indicates the number of valence electrons for main group elements (Groups 1, 2, and 13–18). For example:
Elements in Group 1 have 1 valence electron, elements in Group 2 have 2 valence electrons etc
Source: Myschool Past Questions Archive (Record #77163)
Chemistry
WAEC / WASSCE 2025
Atomic Structure and Periodic Table
Solution
Nucleons are sub-atomic particles which consist of
A
protons and neutrons
B
neutrons and electrons
C
protons and electrons
D
neutrons, protons and electrons
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Nucleons are the subatomic particles that reside within the atomic nucleus. Specifically, they are:
(i)Protons: Positively charged particles that determine the atomic number of an element.
(ii)Neutrons: Electrically neutral particles that contribute to the mass and stability of the nucleus.
Source: Myschool Past Questions Archive (Record #77164)
Chemistry
WAEC / WASSCE 2025
Matter & Separation Techniques
Solution
A few drops of sodium hydroxide is added to an aqueous solution, a green precipitate is formed. The ion that may be present in the solution is
A
Cu\(^{2+}\)
B
Fe\(^{2+}\)
C
Fe\(^{3+}\)
D
NH\(_4\)\(^{+}\)
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The ion present in the solution is Iron(II) (Fe\(^{2+}\)). When aqueous sodium hydroxide (NaOH) is added to a solution containing iron(II) ions, a dirty green precipitate of iron(II) hydroxide, (Fe(OH)\(_2\)), forms. This precipitate is insoluble in excess sodium hydroxide.
Source: Myschool Past Questions Archive (Record #77165)
Chemistry
WAEC / WASSCE 2025
Atomic Structure and Periodic Table
Solution
When C\(_2\)H\(_4\) molecule is polymerized, the polymer formed is
A
polyethene
B
polyethane
C
polypropene
D
polybutene
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The chemical formula C\(_2\)H\(_4\) represents ethene (also known as ethylene), which is the simplest alkene containing a double covalent bond between two carbon atoms.During addition polymerization, the double bond between the carbon atoms in the ethene monomers breaks under high pressure and temperature. These monomers link together in a long chain of repeating units to form polyethene (or polyethylene), a widely used plastic.
Source: Myschool Past Questions Archive (Record #77166)
Chemistry
WAEC / WASSCE 2025
Matter & Separation Techniques
Solution
When a hypothesis is proven within the limit of available evidence, it becomes a
A
scope
B
theory
C
principle
D
law
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
In the scientific method, a hypothesis is a tentative explanation or an educated guess that can be tested through experimentation. When a hypothesis is rigorously tested and supported by a significant amount of evidence within the limits of what is currently known, it is elevated to the status of a theory.
Source: Myschool Past Questions Archive (Record #77168)
Chemistry
WAEC / WASSCE 2025
Stoichiometry & Mole Concept
Solution
Empirical formula is the
A
simplest formula of a compound
B
molecular formula of a compound
C
chemical formula of a compound
D
structural formula of a compound
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The empirical formula is defined as the chemical formula that represents the simplest whole-number ratio of the atoms of each element present in a compound. For this reason, it is also frequently referred to as the simplest formula.
Source: Myschool Past Questions Archive (Record #77252)
Chemistry
UTME / JAMB 2025
Matter & Separation Techniques
Solution
The 5\(^{th}\) member of an alkyne series is
A
C\(_5\)H\(_8\)
B
C\(_5\)H\(_{10}\)
C
C\(_6\)H\(_{12}\)
D
C\(_6\)H\(_{10}\)
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
The general formula for the alkyne homologous series is C\(_n\)H\(_{2n−2}\), where n is the number of carbon atoms. The first member of the series has n=2 (ethyne), as a minimum of two carbon atoms is required for a triple bond.
The 5th member of the alkyne series is hexyne (C\(_6\)H\(_{10}\)).
Source: Official Exam / Past Question Archive
Chemistry
WAEC / WASSCE 2025
Matter & Separation Techniques
Solution
Empirical formula is the
A
simplest formula of a compound
B
molecular formula of a compound
C
chemical formula of a compound
D
structural formula of a compound
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The empirical formula is defined as the chemical formula that represents the simplest whole-number ratio of the atoms of each element present in a compound. For this reason, it is also frequently referred to as the simplest formula.
Source: Official Exam / Past Question Archive
English Language
UTME / JAMB 2025
English Grammar
Solution
What was the common ritual at the morning assembly at Stardom on Tuesdays and Thusdays?
A
Christian and Muslim Prayers.
B
Words of Exaltation.
C
The second stanza of the national anthem.
D
The principal’s address.
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
On Tuesdays and Thursdays, Stardom Schools recited the second stanza of the national anthem: "Oh God of creation, direct our noble cause..." This can be found on page 6 of the novel.
Source: Myschool Past Questions Archive (Record #71531)
English Language
UTME / JAMB 2025
English Grammar
Solution
Who among the staff at Stardom School is also a pastor?
A
Mr. Justus Anabel.
B
Mr. Ope Wande.
C
Mr. Audu.
D
Mr. Obong Ukake.
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
Mr Ope Wande, the Physics teacher, is also a pastor. This can be found on page 9 of the novel.
Source: Myschool Past Questions Archive (Record #71537)
English Language
UTME / JAMB 2025
English Grammar
Solution
What was given as a reward to teachers whose students scored distinctions in their subjects?
A
₦30,000 each.
B
₦20,000 each.
C
Bottles of wine only.
D
A special commendation letter.
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
The teachers who handled subjects where candidates scored distinctions took home 30,000 each. This can be found on page 8 of the novel.
Source: Myschool Past Questions Archive (Record #71538)
English Language
UTME / JAMB 2025
English Grammar
Solution
Why did the MD decide to send the principal home after the crying incident?
A
To protect the school’s reputation.
B
To avoid disturbing the students further.
C
To allow the principal to rest.
D
To prepare for a replacement.
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
The MD instructed Mr Bepo to be taken home because she felt pressed to move the drama away from the school as soon as possible. She was worried about what the parents would think if they learned that the principal was weeping like a child. This can be found on page 9 of the novel.
Source: Myschool Past Questions Archive (Record #71539)