Waec Chemistry 2021 Past Questions and Answers

Question 1:

• WAEC 2021

Study the graphs below and use them to answer the question below



Which of the graphs illustrates the variation of the pH of a given volume of strong acid solution (y-axis) with the volume of strong base titrated against its (x-axis)?

A. I
B. II
C. III
D. IV

Question 2:

• WAEC 2021

Study the graphs below and use them to answer the question below



Which of the graphs illustrates the variation of the solubility of a salt in water (y-axis), with an increase in temperature (x-axis) if the dissolution process is exothermic?

A. I
B. II
C. III
D. IV

Question 3:

• WAEC 2021

The formation of ethene from dehydration of ethanol can be described as ____________

A. An addition reaction
B. An elimination reaction
C. An oxidation reaction
D. A substitution reaction

Question 4:

• WAEC 2021

Which of the following gasses is highly soluble in water at room temperature

A. Ammonia
B. Carbon (IV) oxide
C. Chlorine
D. Nitrogen

Question 5:

• WAEC 2021

A molecular of phosphorus is ____________

A. Diatomic
B. Triatomic
C. Tetraatomic
D. Monoatomic