WAEC GCE (November/December Second Series) Chemistry Objective and Essay examination will hold as scheduled below:
- Date: Thursday, 20th November, 2025
- Chemistry 2 (Essay): 2hrs – 08:30 hrs – 10:30 hrs
- Chemistry 1 (Objective): 1hr – 10:30 hrs – 11:30 hrs
WAEC GCE 2025 Chemistry ESSAY/THEORY answers:
WAEC GCE 2025 Chemistry (Obj) Objective Questions and answers
WAEC GCE Chemistry 2025/2026 Objectives/Essay Questions and Answers
Instruction: Answer all questions.
-
Which of the following is a noble gas?
A. Nitrogen
B. Argon
C. Hydrogen
D. Oxygen
Answer: B -
The atomic number of an element represents the number of:
A. Protons
B. Neutrons
C. Electrons and neutrons
D. Protons and neutrons
Answer: A -
The process of converting a liquid into vapor is known as:
A. Condensation
B. Evaporation
C. Sublimation
D. Filtration
Answer: B -
Which of the following is an example of a physical change?
A. Rusting of iron
B. Burning of wood
C. Melting of ice
D. Digestion of food
Answer: C -
The law of conservation of mass was proposed by:
A. Dalton
B. Boyle
C. Lavoisier
D. Avogadro
Answer: C -
Which of these elements is a halogen?
A. Sodium
B. Chlorine
C. Neon
D. Sulphur
Answer: B -
The chemical symbol for potassium is:
A. Po
B. P
C. K
D. Pt
Answer: C -
The number of atoms in one mole of a substance is called:
A. Molecular mass
B. Avogadro’s number
C. Atomic number
D. Molar volume
Answer: B -
Which of these gases turns limewater milky?
A. Hydrogen
B. Oxygen
C. Carbon dioxide
D. Nitrogen
Answer: C -
The pH of a neutral solution is:
A. 0
B. 7
C. 10
D. 14
Answer: B -
The component of air that supports combustion is:
A. Carbon dioxide
B. Oxygen
C. Nitrogen
D. Argon
Answer: B -
The bond formed between two non-metals is a:
A. Ionic bond
B. Metallic bond
C. Covalent bond
D. Hydrogen bond
Answer: C -
Which gas is used in the manufacture of ammonia?
A. Carbon dioxide
B. Hydrogen
C. Nitrogen
D. Both B and C
Answer: D -
The periodic law states that the properties of elements are periodic functions of their:
A. Atomic number
B. Atomic mass
C. Density
D. Reactivity
Answer: A -
The process used to separate crude oil into components is:
A. Distillation
B. Filtration
C. Sublimation
D. Crystallization
Answer: A -
A solution that resists change in pH is called a:
A. Neutral solution
B. Buffer solution
C. Basic solution
D. Acidic solution
Answer: B -
Which of the following oxides is acidic?
A. Sodium oxide
B. Magnesium oxide
C. Carbon dioxide
D. Aluminium oxide
Answer: C -
The apparatus used for heating strongly in the laboratory is:
A. Beaker
B. Conical flask
C. Crucible
D. Burette
Answer: C -
The solubility of gases in liquids decreases with:
A. Increase in temperature
B. Increase in pressure
C. Decrease in pressure
D. Both A and C
Answer: D -
The color of litmus paper in acid is:
A. Blue
B. Pink
C. Red
D. Purple
Answer: C -
The oxidation number of sulphur in H₂SO₄ is:
A. +2
B. +4
C. +6
D. 0
Answer: C -
The molar volume of a gas at STP is:
A. 11.2 dm³
B. 22.4 dm³
C. 44.8 dm³
D. 1 dm³
Answer: B -
The product of neutralization is:
A. Salt and water
B. Acid and base
C. Base and gas
D. Water only
Answer: A -
Which of the following gases is lighter than air?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen
Answer: D -
The type of reaction in which heat is absorbed is:
A. Exothermic
B. Endothermic
C. Combustion
D. Neutralization
Answer: B -
The chemical formula for ammonia is:
A. NH₄
B. NH₃
C. NO₂
D. N₂O
Answer: B -
The type of bond in NaCl is:
A. Ionic
B. Covalent
C. Hydrogen
D. Metallic
Answer: A -
The major constituent of air is:
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Argon
Answer: B -
Which element burns with a lilac flame?
A. Sodium
B. Potassium
C. Calcium
D. Iron
Answer: B -
Temporary hardness of water can be removed by:
A. Boiling
B. Filtration
C. Distillation
D. Cooling
Answer: A
WAEC GCE Chemistry 2025/2026 Objectives/Essay Questions and Answers (Nov/Dec)
SECTIONS B: THEORY QUESTIONS
1. Define chemistry and explain its two main branches.
Answer: Chemistry is the study of matter, its composition, structure, and the changes it undergoes.
-
Organic Chemistry: Studies carbon-containing compounds.
-
Inorganic Chemistry: Studies non-carbon compounds.
2. State Dalton’s Atomic Theory.
Answer:
-
Matter is made up of indivisible atoms.
-
Atoms of the same element are identical.
-
Atoms combine in simple ratios to form compounds.
3. Explain the difference between physical and chemical changes with examples.
Answer:
-
Physical Change: No new substance is formed (e.g., melting of ice).
-
Chemical Change: New substance is formed (e.g., rusting of iron).
4. Describe how oxygen gas can be prepared in the laboratory.
Answer:
By decomposing potassium trioxochlorate(V) using heat in the presence of manganese(IV) oxide as a catalyst.
5. Explain the following terms:
(a) Isotopes
(b) Ionization energy
(c) Electronegativity
Answer:
(a) Atoms with the same number of protons but different neutrons.
(b) Energy required to remove an electron.
(c) Tendency to attract electrons in a bond.
6. Define acids, bases, and salts with one example each.
Answer:
-
Acid: HCl
-
Base: NaOH
-
Salt: NaCl
7. Explain the water treatment process.
Answer:
Sedimentation → Filtration → Chlorination → Distribution.
Conclusion
This post has provided verified WAEC GCE Chemistry Questions and Answers 2025 (Nov/Dec) — covering both Objective and Essay sections to help private candidates prepare confidently for the upcoming paper.
Keep revising past questions, formulas, and practical experiments for the best results.
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