complete WAEC 2023 Chemistry Questions and Answers: Free Essay and Objectives

Complete WAEC 2023 Chemistry Questions and Answers: Complete WAEC Chemistry Questions and Answers 2023 (Theory and Objectives). Welcome to the WAEC 2023 Chemistry Questions and Answers page.

You will find WAEC 2023 Chemistry Objective Answers, WAEC Chemistry Essay Answers 2023, WAEC 2023 Chemistry Answers, and the tips you need to pass your WAEC Chemistry exam easily.

WAEC 2023 Chemistry Questions and Answers
WAEC 2023 Chemistry Questions and Answers

complete WAEC 2023 Chemistry Questions and Answers

WAEC 2023 Chemistry Questions and Answers

During the WAEC 2023 Chemistry exam, the 2023 WAEC Chemistry will be posted here. Keep checking and refreshing this page for updates.

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Here are today’s WAEC 2023 Chemistry OBJ Answers:

Please note that the answers below are for the 2020 Nov/Dec answers.

Note: Trace the answer back to your objective.

[If any options appear here, choose it from your objectives.]

WAEC 2023 Chemistry Questions and Answers – Objective Answers

1 Involves the loss and gain of electrons

2 Polymerisation

3 Global warming

4 3

5 Zinc ions

6 +1.56V

7 Ethene

8 NH3

9 Propanol

10 28

11 Hydrolysis

12 d-orbital

13 Lowering the activation energy

14 Closeness between reactant particles

15 Remaining the same with time

16 Reaction vessel Fels cool during the reaction

17 Faster

18 Solvent extraction

19 Saturated Solution

20 2.75mol/dm³

21 Partially dissociates in aqueous solution

22 138g

23 HI

24 2.00cm³

25 hydrogen chloride

26 strong electrovalent bonds between ions

27 is not ductile

28 Electrons

29 C2H4

complete WAEC 2023 Chemistry Questions and Answers

30 Aluminium

31 0.010mol/dm³

32 PbCO3

33 Linear

34 HCL and HOCL

35 +1

36 Ionic bond

37 have a relatively low ionization energy

38 sour to taste

39 I, III, and IV only

40 chromatography

41 2.00 dm

42 mole of solvent in 1dm³ of solution

43 does not contain neutron

44 1s²2s²2p⁶

45 Ammonium chloride

46 IV

47 I, II, and IV only

48 Quantum numbers of Electrons

49 -273⁰C

50 Mass number

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WAEC Chemistry Questions and Answers

The answers to the objective questions





41-50: ABB

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complete WAEC Chemistry Questions and Answers 2023/2024 (Essay and Objectives)

WAEC GCE Chemistry Theory Answers:

(1a) (i) Sodium trioxonitrate (v) decahydrate –> NaNO₃ . 10H₂O

1a (ii) Sodium Oxide –> Na₂O

1a (iii) Potassium tetraoxophospate (v) –> K₃PO₄


The following items are produced:

Hydrogen gas (a+ cathode)

Chlorine gas (a+ anode)

1c (i) it decrease down the group

1c (ii)

As the atomic radius decreases down the group, the attraction of the positive nucleus of the outermost electron decreases, and thus the ionization energy decreases.

(1di) Nitrogen and carbon (ii) oxide

(1dii) it is used to heat furnace

(1diii) It is a source of nitrogen for the production of ammonia.


Sodium hydrogen

– used in qualitative analysis
– Purification of bauxite


Sodium trioxocarbonate (iv)

-Manufacture of glass
-As a water soften


2-amino propane


Percentage C5H12 of mass m = 7.2g
Volume of O2 = 20.0dm³
(i) from the general combustion equation
CxHy(g) + (x+y/4)O2 –> XCO2 + y/2H2O
C5H12(l) + 802(g) –> 5CO2(g) + 6H2O(l)


1 mole of C5H12(72g) = 5 moles of CO2
At stop 7.2gC5H12 = x volume of CO2
X = 7.2g×5×22.4dm³/72g
X = 5×2.224 = 11.2dm³ of CO2


Volume of oxygen left after the reaction from the equation of reaction
1 mole of C5H12(72g) = 8(22.4)dm³
7.2g = x
X = 7.2×8×22.4/72 = 17.92dm³
Volume of O2 left after the reaction
= 20.0dm³ – 17.92dm³
= 2.08dm³


When molecules collide with one another they possess kinetic energy. As most energetic molecules (those with higher kinetic energy) try to escape. Their escape may be increased by heat or by passing a wave of air over the container or by increasing the surface area of the container.

As they attempt to do so, some molecules lose energy on collision and fall back into the container; as a result, the average kinetic of the molecules in the container decreases, resulting in a cooling effect.


According to Avogadro’s Law, the total number of atoms/molecules in a gas (i.e. the amount of gaseous substance) is directly proportional to the volume occupied by the gas at constant temperature and pressure.


N2(g) + 3H2—> 2NH3
Where 1 mole = 30cm³ of gas

At constant temperature, the volume of a fixed mass of gas. When the volume of a cylinder or container is increased, the gases have more space to travel and collide, so the pressure is reduced; however, when the volume is decreased or compressed, the gases have less space to travel, so more pressure is built up.

WAEC 2023 Chemistry Questions and Answers
WAEC 2023 Chemistry Questions and Answers

WAEC 2023 Chemistry Questions and Answers

No (3ai)

¹³R, ⁸Q


Valency of ¹³R is 3
⁸Q= 2,6
Valency of ⁸Q=2


2H² SO4(aq)+4NaOH(aq)—>2Na² SO4(aq)+4H²O(s)


Sodium teraoxosulphate (iv) salt and water


The resulting solution NaSO4 is basic, hence will have no effect on litmus paper


When heated to dryness it can be utilized as a dehydrating agent


2H² SO4(aq)+4NaOH(aq)—>2Na² SO4(aq)+4H²O(s)


Sodium teraoxosulphate (iv) salt and water


The resulting solution NaSO4 is basic and will have no effect on litmus paper


When heated to dryness it can be utilized as a dehydrating agent

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The following questions are strictly for practice.

1. Which of the following best describes the difference between a gas and a vapour?

(a) Unlike gases, vapours are liquids at room temperature

(b) Unlike gases, vapour can easily be condensed into liquids

(c) Unlike gases, vapour is readily converted into solids

(d) Vapours are generally denser than gases

2. Consider the following reaction equation: 2HCI + Ca(OH)2 → CaCI2 + H2O. what is the volume of 0.1 moldm-3, HCI that would completely neutralize 25cm3 or 0.3 moldm-3 Ca(OH)2?

(a) 150 cm3

(b) 75 cm3

(c) 30 cm3

(d) 25 cm3

3. Cu and HNO3 are not suitable for preparing hydrogen gas because of their

(a) Reactivity and oxidation respectively
(b) conductivity and corrosiveness respectively
(c) melting point and reduction respectively
(d) electronegativity and solubility respectively

4. Which of the following formulae cannot be an empirical formula?

(a) CH

(b) CH2

(c) P2O5

(d) N2O4

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5. One of the criteria for confirming the purity of benzene is to determine its

(a) Heat capacity

(b) boiling point

(c) mass

(d) colour

6. When chlorine is passed through a sample of water, the pH of the water sample would be

(a) <7

(b) >7

(c) = 7

(d) 0

7. How many atoms are contained in 0.2 moles of nitrogen [N = 6.02 x 1023]

(a) 1.20 x 1023

(b) 2.41 x 1023

(c) 3.62 x 1023

(d) 4.82 x 1023

Click here to view answer to No.1-7

8. The strength of metallic bonds depends on the

(a) charge density of the atoms

(b) ductility of the metal

(c) number of valence electrons

(d) total number of electrons in the atoms

9. When zinc is added to AgNO3 solution, crystals of silver forms on the zinc surface. This indicates that zinc is

(a) oxidized

(b) reduced

(c) decomposed

(d) dissociated

10. The empirical formula of a compound containing 0.067 mol Cu and 0.066 mol O is [Cu = 63.5, O = 16.0]

(a) Cu2O

(b) CuO

(c) CuO2

(d) Cu2O2

11. The change in the oxidation state of iron in the reaction represented by the equation below is 2FeCI3 + H2S →2FeCI2 + 2HCI + S

(a) +2 to +3

(b) +3 to +2

(c) 0 to +2

(d) +3 to 0

12. Which of the following methods can be used to separate blood cells from plasma?

(a) Centrifugation

(b) Filtration

(c) Chromatography

(d) Distillation

13. Which of the following statements about ionic radius is correct? ‘Ionic radius

(a) Increases as nuclear charge increases

(b) decreases as nuclear charge increases

(c) decreases as nuclear charges decreases.

(d) remains constant as nuclear charge increases

14. Analysis of a hydrocarbon shows that it contains 0.93 g of carbon per gram of the compound. The mole  ratio of carbon to hydrogen in the compound is [H=1.0, C=12.0]

(a) 1:1

(b) 1:2

(c) 2:1

(d) 2:3

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15. The law of definite proportions states that

(a) pure samples of same compound contain the same elements combined in the same proportion by mass

(b) pure samples of substances are in the same proportion by mass

(c) chemical compounds are pure because they contain the same elements

(d) matter can neither be created nor destroyed

16. What is the relative molecular mass of a compound which has empirical formula CH2O? [H=1.0, C=12.0,0=16.0]

(a) 42

(b) 45

(c) 126

(d) 180

17. Atoms are electrically neutral because they

(a) don not conduct electricity

(b) contain equal number of protons and electrons

(c) are composed of neutrons and electrons

(d) cannot be attracted by electromagnetic field

18. Common salt (NaC1) is used for preserving foods. Which of the following properties could be used to determine its purity before use?

(a) Solubility in water

(b) melting point

(c) Relative density

(d) Crystalline nature

19. Which of the following electron configurations represents the transition element chromium (24Cr)?

(a) 1s2 2s2 2p6 3s2 3p6 4s2 3d4

(b) 1s22 2s2 2p6 3s2 3p6 3d6

(c) 1s2 2s2 2p6 2s2 3d4 4s1

(d) 1s2 2s2 2p6 3s2 3p6 4s1 3d5

20. The atomic number of an isotope of hydrogen is equal to its mass number because it

(a) has a totally filled valence shell

(b) has a high charge to mass ratio

(c) does not contain neutrons

(d) exhibits isotopy

21. The total number of shared pair of electrons in the compound below is

(a) 5

(b) 6

(c) 10

(d) 12

22. The bonding pair of electrons in a hydrogen chloride molecule is pulled towards the chlorine atom because

(a) Chlorine has a larger atomic size

(b) chlorine has a large atomic mass

(c) chlorine is more electronegative

(d) there is no bonding orbitals within the hydrogen atom

23. The solubility of CO2 in water can be accounted for by

(a) van der waal’s forces

(b) ionic attraction

(c) dipole attraction

(d) covalent bonding

24. Which of the following properties would not influence electrovalent bond information?

(a) Electronegativity

(b) Electron affinity

(c) Ionization potential

(d) Catalytic ability

25. Particles in a solid exhibit

(a) Vibrational motion only

(b) vibrational and translational motion

(c) vibrational and random motion

(d) random and translational motion

WAEC 2023 Chemistry Questions and Answers – Chemistry Essay

The above questions are not exactly WAEC 2023 Chemistry Questions and Answers but likely WAEC Chemistry repeated questions and answers.

These are practice questions. The WAEC 2023 Chemistry expo will be available on this page 30 minutes before the start of the WAEC GCE Chemistry examination. Keep checking back and refreshing this page for updates.

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complete WAEC 2023 Chemistry Questions and Answers

If you have any questions about the WAEC Chemistry questions and answers, please leave them in the comments section.

Good luck with your exams.

WAEC 2023 Chemistry Questions and Answers – Examples

Here are some chemistry questions and their corresponding answers:

Q: What is the atomic number of carbon?

A: The atomic number of carbon is 6.

Q: What is the chemical formula for water?

A: The chemical formula for water is H2O.

Q: What is the pH scale used for?

A: The pH scale is used to measure the acidity or alkalinity of a solution.

Q: What is the difference between an element and a compound?

A: An element is a pure substance composed of atoms with the same atomic number, while a compound is a substance made up of two or more different elements chemically bonded together.

Q: What is oxidation and reduction in chemistry?

A: Oxidation is the process of losing electrons, while reduction is the process of gaining electrons. Together, they make up redox reactions.

Q: What is the Law of Conservation of Mass?

A: The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants is equal to the total mass of the products.

Q: What is a covalent bond?

A: A covalent bond is a chemical bond formed by the sharing of electrons between atoms.

Q: What is an exothermic reaction?

A: An exothermic reaction is a chemical reaction that releases energy in the form of heat.

Q: What is Avogadro’s number?

A: Avogadro’s number is 6.022 x 10^23, and it represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance.

Q: What is the difference between an acid and a base?

A: Acids are substances that release hydrogen ions (H+) in solution, while bases are substances that release hydroxide ions (OH-) or accept H+ ions.

These are just a few examples of WAEC 2023 Chemistry Questions and Answers. Chemistry is a vast field with many sub-disciplines, so there are numerous other topics and questions to explore within the subject.

WAEC 2023 Chemistry Questions and Answers
WAEC 2023 Chemistry Questions and Answers

How to Pass WAEC 2023 Chemistry very well

To pass WAEC 2023 Chemistry very well, you can follow these steps:

  1. Study and Understand the syllabus: Obtain a copy of the WAEC Chemistry syllabus for 2023 and carefully read through it. Understand the topics that will be covered and the depth of knowledge required.
  2. Create a study schedule: Plan your study time effectively by creating a study schedule. Allocate specific time slots for each topic, ensuring you cover all areas of the syllabus. Stick to the schedule and maintain consistency in your study routine.
  3. Gather study materials: Collect recommended textbooks, past question papers, and other relevant study materials. These resources will provide you with valuable information and help you become familiar with the exam format.
  4. Review and revise: Start by reviewing the fundamental concepts in Chemistry and gradually move on to more complex topics. Use your study materials to understand the content thoroughly. Take notes, highlight important points, and create summary sheets for quick revision.
  5. Practice past questions: Familiarize yourself with the style and structure of WAEC Chemistry exams by practicing past questions. Solve them within the allotted time to improve your time management skills and understand the exam pattern. Analyze your answers to identify areas of weakness and focus on improving them.
  6. Seek clarification: If you encounter difficult concepts or have doubts about certain topics, don’t hesitate to seek clarification. Approach your teacher, classmates, or even online resources for help. Understanding the subject matter fully will increase your chances of success.
  7. Form study groups: Consider forming study groups with classmates who are also preparing for WAEC Chemistry. Collaborative learning can be beneficial as you can discuss challenging topics, share insights, and quiz each other.
  8. Utilize online resources: Take advantage of online resources such as educational websites, video tutorials, and interactive quizzes. These resources can provide additional explanations and practice opportunities to reinforce your understanding of Chemistry concepts.
  9. Practice active learning: Instead of passively reading or memorizing information, engage in active learning techniques. This includes explaining concepts in your own words, teaching others, solving problems, and conducting experiments (where possible). Actively engaging with the material will enhance your understanding and retention.
  10. Understand the marking scheme: Familiarize yourself with the WAEC Chemistry marking scheme. Understand how marks are allocated for each question and the specific requirements for different types of questions, such as multiple-choice, short-answer, and essay questions. This knowledge will guide you in providing the appropriate level of detail in your responses.
  11. Develop good exam techniques: In addition to mastering the subject matter, it’s crucial to develop effective exam techniques. Practice time management during your study sessions and simulate exam conditions when solving past papers. Learn how to read questions carefully, plan your answers, and present your responses clearly and concisely.
  12. Pay attention to practical aspects: Chemistry involves practical experiments, so make sure to understand the principles and techniques involved. Review laboratory procedures, safety precautions, and the use of equipment. Additionally, practice answering practical questions and familiarize yourself with common experimental setups.
  13. Take care of your well-being: Remember to take care of your physical and mental well-being during your preparation. Get sufficient rest, maintain a balanced diet, and engage in regular exercise. Manage your stress levels by incorporating relaxation techniques such as meditation or deep breathing exercises. A healthy mind and body will contribute to your overall performance.
  14. Confidence and positive mindset: Approach the exam with a positive mindset and believe in your abilities. Confidence can greatly impact your performance. Remind yourself of your hard work and preparation, and enter the exam hall with a calm and focused mindset.


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