SCH4U Graded 12 Chemistry Final Exam | Questions and Answers | 2026 Update | 100% Correct-OVS Graded A+

SCH4U Graded 12
Chemistry Final Exam |
Questions and Answers |
2026 Update | 100%
Correct-OVS Graded A+

Q1: What is the maximum number of electrons that can occupy an f-subshell?

 A) 6
 B) 10
 C) 14 ✅
 D) 2

Rationale: An f-subshell has 7 orbitals, each holding 2 electrons, for a total of 14
electrons.




Q2: Which of the following quantum number sets is valid?

 A) n=2, l=2, mₗ=0, mₛ=+½
 B) n=3, l=1, mₗ=-2, mₛ=-½
 C) n=4, l=2, mₗ=1, mₛ=+½ ✅
 D) n=1, l=1, mₗ=0, mₛ=+½

Rationale: For n=4, l=2 is allowed (0 to n-1), mₗ=1 is allowed (-2 to +2), mₛ=+½ is
allowed.

, Q3: Which molecule has a trigonal pyramidal molecular geometry?

 A) BF₃
 B) CH₄
 C) NH₃ ✅
 D) CO₂

Rationale: NH₃ has 3 bonding pairs and 1 lone pair (AX₃E), giving trigonal pyramidal
geometry.




Q4: Which intermolecular force is primarily responsible for the high boiling point
of water?

 A) London dispersion forces
 B) Dipole-dipole forces
 C) Hydrogen bonding ✅
 D) Ionic bonding

Rationale: Water molecules form strong hydrogen bonds (O-H bonds), requiring
significant energy to overcome.




Q5: A carbon atom with sp hybridization has what geometry?

 A) Tetrahedral
 B) Trigonal planar
 C) Linear ✅
 D) Bent

Rationale: sp hybridization results in two hybrid orbitals arranged 180° apart, giving
linear geometry.

, Q6: Which compound contains both ionic and covalent bonds?

 A) NaCl
 B) CO₂
 C) NH₄Cl ✅
 D) CH₄

Rationale: NH₄Cl contains ionic bonds between NH₄⁺ and Cl⁻, and covalent bonds
within the NH₄⁺ ion.




Q7: What is the electron configuration for Fe³⁺?

 A) [Ar] 4s² 3d⁶
 B) [Ar] 4s¹ 3d⁵
 C) [Ar] 3d⁵ ✅
 D) [Ar] 4s² 3d³

Rationale: Fe has [Ar] 4s² 3d⁶. Removing 3 electrons (2 from 4s, 1 from 3d) gives [Ar]
3d⁵.




Q8: Which molecule is polar?

 A) CCl₄
 B) CH₂Cl₂ ✅
 C) CO₂
 D) BeCl₂

Rationale: CH₂Cl₂ has a tetrahedral structure with different electronegativities, resulting
in a net dipole moment.




Q9: Calculate the frequency of light with wavelength 600 nm. (c = 3.0 × 10⁸ m/s)

 A) 5.0 × 10¹⁴ Hz ✅

,  B) 2.0 × 10¹⁵ Hz
 C) 5.0 × 10⁵ Hz
 D) 1.8 × 10¹¹ Hz

Solution: ν = c/λ = (3.0 × 10⁸)/(600 × 10⁻⁹) = 5.0 × 10¹⁴ Hz




Q10: Which element has the largest atomic radius?

 A) F
 B) Cl
 C) Br ✅
 D) I

Rationale: Atomic radius increases down a group due to additional electron shells.
Iodine is the largest among halogens listed.




Q11: The VSEPR shape of SO₂ is:

 A) Linear
 B) Bent ✅
 C) Trigonal planar
 D) Tetrahedral

Rationale: SO₂ has 2 bonding pairs and 1 lone pair (AX₂E), giving a bent shape.




Q12: Which is an example of a resonance structure?

 A) H₂O
 B) O₃ ✅
 C) CH₄
 D) HCl