WAEC Chemistry Questions 2020 Objective and Theory Updates : Current School News

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WAEC Chemistry Questions 2021 Objective and Theory Updates

Filed in Exam, WAEC News by on September 21, 2021

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– WAEC Chemistry Questions –

WAEC Chemistry Questions: Chemistry WAEC 2021 Expo Questions is out now on our website. In this article, I will show you past WAEC Chemistry random repeated questions for free. All you need to do is to stay focus and follow this guide.

WAEC Chemistry Questions

The West African Examinations Council (WAEC) is an examination board that conducts the West African Senior School Certificate Examination, for University and Jamb entry examination in West African countries.

In a year, over three million candidates registered for the exams coordinated by WAEC.


There will be three papers, papers 1, 2 and 3 all of which must be taken. Papers 1 and 2 will be composite paper to be taken in one sitting.


This will comprise fifty multiple-choice objective questions drawn from Section A of the syllabus. They will require candidates to answer all the questions within 1 hour for 50 marks.


This will be a 2-hour essay paper covering the entire syllabus and carrying a maximum of 100 marks. The paper will be in two sections: Sections A and B.

Section A: This will comprise ten short structured questions drawn from the common portion of the syllabus (i.e. Section A of the syllabus). They will require candidates to answer all the questions for 25 marks.

Section B: This will comprise two questions from the common portion of the Syllabus (i.e. Section A of the syllabus) and two other questions from the Section of the syllabus which is peculiar to the country of the candidate (i.e. either) Section B or C of the syllabus).

They will require candidates to answer any three of the questions. Each question shall carry 25 marks.


This shall be a 2-hour practical test for school candidates or1 hour 30 minutes alternative to practical work test for private candidates. Each version of the paper shall contain three compulsory questions and carry 50 marks.

The questions shall be on the following aspects of the syllabus:

One question on quantitative analysis; One question on qualitative analysis; The third question shall test candidates’ familiarity with the practical activities suggested in the syllabus.

WAEC Chemistry Objective Questions


WAEC Chemistry Theory Questions


1. Identify the solid remaining when each of the following is heated.
(a) lithium trioxonitrate (V);
(b) potassium trioxonitrate (V);
(c) calcium trioxonitrate (V);

2. (a) When calcium oxide and coke are heated in a electric furnace, the roducts are carbon (ii) oxide and calcium carbide (CaC2), write the equation for this reaction.

(b) Addition of water to calcium carbide leads to the formation of calcium hydroxide and ethyne. Write the equation for the production of ethyne.

3. Calculate the percentage by mass of silicon tetrachloride. [2 marks]
4. Ammonia, NH3, and phosphine, Ph3, are the hydrides of the first two elements in group 5.
(a) Draw a dot and cross diagram for the ammonia molecule. [2 marks]
(b) Sketch and explain the shape of the ammonia molecule. [3 marks]

5. The first ionization energy of chlorine is +1260KJmol-1.
(a) Define the term first ionization energy.
(b) State and explain the general trend in the values of the first ionisation energy for the elements across the period, sodium to argon in the periodic table.

6. Compound A consisting of carbon and hydrogen only. The compound was found to contain 80% carbon by mass.
(a) Calculate the empirical formula of compound A using the data above.
(b) The relative molecular mass of compound A was found to be 30.
Use this information to deduce the molecular formula of compound A.
[H = 1.00 C = 12.00]

7. State two factors other than a change in temperature or the use of a catalyst that influence the rate of a chemical reaction.


1. (a) Two elements represented by the letters Q and R have atomic numbers 9 and 12, respectively.
(i) Write the electron configuration of R.
(ii) To what group does Q belong in the periodic table.
(iii) Write the formula of the compound formed when Q combines with R.
(iv) Explain briefly why Q is a good oxidizing agent.
(v) State whether R would be expected to form acidic or basic oxide.
(b) (i) State two assumptions of the kinetic theory of gases.
(ii) When some solids are heated, they change directly into the gaseous state. What name is given to this phenomenon?
(iii) List two substances that exhibit the phenomenon mentioned in (ii).
(iv) Write an expression to show the mathematical relationship between the rate of diffusion of a gas and its vapour.

2. An aqueous solution has a pH of 4.0.
(a) (i) What is the hydrogen ion concentration of the solution?
(ii) What effect will it have on litmus paper?
(iii) Which of the following salt solutions would have the same effect on litmus? Give a reason for your answer. NH4Cl(aq); NaCl(aq) ; CH3OON(aq).
(b) (i) Differentiate between a fine chemical and a heavy chemical.
(ii) Name two sources of air pollution.
(iii) Suggest one way of reducing air pollution in cities


3. (a) (i) Explain briefly the fermentation process.
(ii) Write a balanced equation for the fermentation of glucose.
(iii) What substance must you add to the glucose solution to ferment it?
(iv) Explain briefly why tightly corked glass filled to the brim with palm wine shatters on standing.
(b) State one industrial application of each of the following methods of separation:
(i) Crystallization;
(ii) Fractional distillation.
(c) Explain the following terms:
(i) Saponification;
(ii) Esterification.
(d) Write a balanced equation to illustrate each of the terms in (c).
(e) i) What is hydrocarbon compound?
(ii) Name two principal sources of hydrocarbons.

DISCLAIMER! These are not real WAEC Chemistry questions but likely repeated questions over the years to help candidate understand the nature of their examinations. Ensure to note every question provided on this page.

If you need us to help you with more updated information at the right time about WAEC Chemistry Questions 2021, kindly provide us with your phone number and email address in the comment box below. Also, ask any question pertaining to this guide.

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