WAEC Chemistry Past Questions and Answers in 2023 PDF Download Objective & Theory

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Chemistry 2 – Theory/Essay Questions.
Chemistry 1 – Objective Test Questions.

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SSCE WAEC Chemistry Objective Questions and Answers

CHEMISTRY Paper 1 (Objective Test Questions)
Paper 1 will last for 1 hours
Use HB pencil throughout.

Answer All Questions
Each question is followed by four options lettered A to D. Find out the correct options for each question and shade in pencil on your answer sheet, the answer space which bears the same letter as the option you Chosen. Give only one answer to each question. An example is given below

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Chemistry WAEC Objective Questions

Which of the following elements reacts with water?
A. Carbon
B. Iodine
C. Sodium
D. Sulphur

The correct answer is Sodium, which is lettered C and therefore answer space C would be shaded.
[A] [ B ] [C] [ D ]

Think carefully before you shade the answer spaces; erase completely any answer you wish to change.

Which of the following raw materials is used in the plastic industry?
A. Ethene
B. Methane
C. Sulphur
D. Hydrogen

Which of the following organic compounds can undergo both addition and substitution reactions?
A. Petane
B. Benzene
C. Propane
D. Hexane

Which of the following equations represents a redox reaction?
A. AgNO 3 (aq) + KCl(ag)->AgCl(s)+ KNO3(aq)
B. HNO3 (aq)+ NaOH(aq) -> NaNO3 (aq) + H2O(l)
C. CaCO 3 (s) -> CaO(s) + CO 2 (g)
D. 2H2 S(g) + SO2 (g) -> 2H2O(I) + 3S(g)

The process of extraction of iron from its ore is
A. decomposition.
B. oxidation.
C. reduction.
D. sublimation.

What is the solubility of a salt if 0.4 g of it is obtained on evaporating 200 cm3 of its saturated solution to dryness?
A. 0.08 gdm-3
B. 2.00 gdm-3
C. 8.00 gdm-3
D. 80.00 gdm-3

An acidic salt has
A. double anions in its aqueous solution.
B. a single cation in its aqueous solution.
C. hydrogen ions in its aqueous solution.
D. hydrogen atoms in its aqueous solution.

A reaction is endothermic if the
A. reaction vessel feels cool during the reaction.
B. enthalpy change is negative.
C. bond forming energy exceeds bond breaking energy.
D. heat of formation of reactants exceeds heat of formation of products.

In which of the following compounds does hydrogen form ionic compounds?
A. CH4
B. HCl
C. NH3
D. NaH

Consider the following reaction equation:
Br2 + 2KI -> 2KBr + I2 .
Bromine is acting as
A. an oxidizing agent.
B. a reducing agent.
C. an acid.
D. a base.

An organic compound has the empirical formula CH2 . If its molar mass is 42 gmol-1
what is its molecular formula? [H = 1.0, C = 12.0]

A. C2 H4
B. C3 H4
C. C3 H6
D. C4 H8

Ethene is produced from ethanol by
A. decomposition.
B. hydrolysis.
C. ozonolysis.
D. dehydration.

Consider the following equilibrium reaction:
2 AB(g) + B2(g) -><- 2AB3(g) AH = -XkJmol-1
The backward reaction will be favored by
A. a decrease in pressure.
B. an increase in pressure.
C. a decrease in temperature.
D. an introduction of a positive catalyst.

What is the mass of solute in 500 cm3 of 0.005 moldm-3 H2SO4 ?
[H =1.0, O = 16.0, S = 32.0]
A. 0.490 g
B. 0.049 g
C. 0.245 g
D. 0.0245 g

Pure water can be made to boil at a temperature lower than 100 °C by
A. reducing its quantity.
B. decreasing the external pressure.
C. distilling it.
D. increasing the external pressure.

Consider the following sketch of the solubility curve of some substances.
Note: scroll down to download the free chemistry waec questions in pdf copy to view the sketch

At what temperature does the solubility of KNO3, equal that of NaNO3?
A. 0°C
B. 20 °C
C. 30 °C
D. 40 °C

When a salt is added to its saturated solution, the salt
A. dissolves and the solution becomes super saturated.
B. dissolves and the solution becomes unsaturated.
C. precipitates and the solution remains unchanged.
D. dissolves and crystals are formed.

When substance X was added to a solution of bromine water, the solution became colorless. X is likely to be
A. propane.
B. propanoic acid.
C. propyne.
D. propanol.

The preferential discharge of ions during electrolysis is influenced by the
A. mechanism of electrolysis.
B. electrolytic reactions.
C. nature of the electrode.
D. type of electrolytic cell.

The valence electrons of 12Mg are in the
A. 3s orbital.
B. 2px orbital.
C. 2s orbital.
D. 1s orbital.

Stainless Steel is an alloy comprising of
A. Fe and C.
B. Fe and Ni.
C. Fe, C and Ni.
D. Fe, C and Al.

The number of hydrogen ions in 1.0 dm3 of 0.02 moldm-3 tetraoxosulphate(VI) acid is [NA = 6.02 x 1023]
A. 1.2 x 1022
B. 1.2 x 1023.
C. 2.4 x 1022.
D. 2.4 x 1023.

The most suitable substance for putting out petrol fire is
A. water.
B. carbon(IV)oxide.
C. fire blanket.
D. sand.

The following factors would contribute to environmental pollution except
A. production of ammonia.
B. manufacture of cement.
C. photosynthesis.
D. combustion.

The position of equilibrium in a reversible reaction is affected by
A. particle size of the reactants.
B. vigorous stirring of the reaction mixture.
C. presence of a catalyst.
D. change in concentration of the reactants.

The diagram below illustrates a conical flask containing water and ice.

NOTE: scroll down and download the free chemistry pdf past questions to see the diagram

Which of the following statements about the diagram is correct?
A. The water is at a lower temperature than the ice
B. Energy is absorbed when the ice changes to water
C. Energy is released when the ice changes to water
D. The water molecules vibrate about a fixed point

Which of the following statements best explains the differences between a gas and a vapor?
A. Unlike gases, vapors are liquids at room temperature
B. Unlike gases, vapor can easily be condensed into liquids
C. Unlike gases, vapour is readily converted into solids
D. Vapours are generally denser than gases

Consider the following reaction equation:
2HCl + Ca(OH)2 –> CaCl2 + H2O.
What is the volume of 0.1 moldrn-3 HCl that would completely neutralize 25cm3 of 0.3 moldm-3 Ca(OH)2?
A. 150 cm3
B. 75 cm3
C. 30 cm3
D. 25 cm3

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. electro negativity and solubility respectively.

Which of the following formulae cannot be an empirical formula?
B. CH2
C. P2O5
D. N204

One of the criteria for confirming the purity of benzene is to determine its
A. heat capacity.
B. boiling point.
C. mass.
D. colour.

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SSCE WAEC Chemistry Theory Questions

Chemistry Paper 2
Paper 2 will last for 2 hours
This paper consists of two sections A and B. Answer one questions from Section A and three questions from Section B.

Credit will be given for clarity of expression and orderly presentation of material.

(1ai) Define the term fermentation.
(1aii) Name the catalyst that can be used for this process.

(b) Name two factors which determines the choice of an indicator for an acid-base titration.
(c) Consider the following reaction equation: [Fe + H2S04 ] FeS04 + H2.
Calculate the mass of unreacted iron when 5.0g of iron reacts with 10cm3 of 1.0 moldrrv3 H SO [Fe = 56.0]
(d) Name one:
(di) Heavy chemical used in electrolytic cells;
(dii) Fine chemical used in textile industries.

(e) Explain briefly how a catalyst increases the rate of a chemical reaction.
(f) (i) Write the chemical formula for the product formed when ethanoic acid reacts with ammonia.
(ii) Give the name of the product formed in 1 (f) (i)..

(g) List three properties of aluminum that makes it suitable for the manufacture of drink can.
(h) State two industrial uses of alkylalkanoates.
(i) List two effects of global warming.
(j) Name two steps involved in the crystallization of a salt from its solution.

Chemistry WAEC Essay Questions

2ai. State the collision theory of reaction rates.
2aii.Using the collision theory, explain briefly how temperature can affect the rate of a chemical reaction.

bi. Sketch a graphical representation of Charles’s law.
bii. Calculate the volume of oxygen that would be required for the complete combustion of 2.5moles of ethanol at s.t.p.
[ molar volume at s.t.p = 22.4dm3]

ci. Define esterification.
cii. Give two uses of alkanoates.
ciii. Give the products of the alkaline hydrolysis of ethyl ethanoate.

d. A tin coated plate and a galvanized plate were exposed for the same length of time.
di. Which of the two plates corrodes faster?
dii. Explain briefly your answer in 2 (d) (i).

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