Sample WAEC-style Practice Questions (Original Content)

WAEC Style

Question 1

Which of the following separation techniques is most suitable for obtaining pure water from sea water?

Question 2

The atomic number of an element is 13. What is its electronic configuration?

Question 3

Atoms of the same element with the same atomic number but different mass numbers are called:

Question 4

Which of the following represents a physical change?

Question 5

Which of the following is a neutral oxide?

Question 6

The bond formed when two atoms share a pair of electrons is called:

Question 7

Which of the following gas laws states that the volume of a fixed mass of gas is inversely proportional to its pressure at constant temperature?

Question 8

What is the oxidation number of sulfur in H2SO4?

Question 9

A solution with a pH of 3 is described as:

Question 10

The process of a solid changing directly into a gas without passing through the liquid state is:

Question 11

Which of the following is an example of an alloy?

Question 12

The main constituent of natural gas is:

Question 13

Calculate the molar mass of CaCO3. (Ca=40, C=12, O=16)

Question 14

Which of the following indicators gives a pink color in an alkaline solution?

Question 15

The most abundant gas in the atmosphere is:

Question 16

Which of the following is an example of an endothermic reaction?

Question 17

Hydrocarbons that contain only single bonds between carbon atoms are called:

Question 18

The catalyst used in the Haber process for the manufacture of ammonia is:

Question 19

A chemical reaction that results in the gain of electrons is called:

Question 20

Which of the following elements is a halogen?

Question 21

Water that does not form lather readily with soap is called:

Question 22

Which of the following is the functional group of alkanols?

Question 23

The number of moles in 5.85g of NaCl is: (Na=23, Cl=35.5)

Question 24

Which type of bonding exists in Sodium Chloride?

Question 25

The maximum number of electrons that can be held in the M shell of an atom is:

Question 26

Which gas is produced when dilute hydrochloric acid reacts with calcium trioxocarbonate (IV)?

Question 27

The process of coating iron with zinc to prevent rusting is called:

Question 28

Elements in the same group of the periodic table have the same:

Question 29

Which of the following is an example of a chemical change?

Question 30

The molar volume of any gas at S.T.P. is:

Question 31

The flame color of Potassium when heated is:

Question 32

The radioisotope used in the treatment of cancer is:

Question 33

Anhydrous Copper (II) sulfate turns blue when added to:

Question 34

Which of the following is a polymer?

Question 35

The rate of a chemical reaction can be increased by:

Question 36

Which gas is known as "laughing gas"?

Question 37

The product formed when ethanol reacts with ethanoic acid in the presence of an acid catalyst is:

Question 38

Which of the following is a saturated hydrocarbon?

Question 39

The noble gas used in filling advertising signs is:

Question 40

The substance that turns lime water milky is:

Question 41

Which of the following is a primary cell?

Question 42

The monomer of natural rubber is:

Question 43

Which of the following elements has the highest electronegativity?

Question 44

The shape of a water molecule is:

Question 45

Which of the following is not a greenhouse gas?

Question 46

The gas used in the vulcanization of rubber is:

Question 47

Which of the following is a heavy metal?

Question 48

The enthalpy change for a reaction where heat is released is:

Question 49

Which of the following is the main ore of aluminium?

Question 50

The functional group present in ethanoic acid is:

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