Waec Chemistry 2020 Past Questions and Answers

Question 46:

• WAEC 2020

Which of the following processes is not exhibited by atoms in order to attain more stable electron configuration?

A. Gaining of electrons
B. Hybridization of orbitals
C. Losing electrons
D. Sharing electron

Question 47:

• WAEC 2020

which of the following quantities is a molar quantity?

A. Molarity
B. Molar mass
C. Mass concentration
D. Molality

Question 48:

• WAEC 2020

Dilution factor is the?

A. Amount of distilled water that is added to the concentrated solution to dilute it
B. Quantity of distilled water added to l dm\(^3\) of the concentrated solution to give the dilute solution
C. Number of times the volume of the concentrated solution is diluted to give the dilute solution
D. Act of diluting the concentrated solution to obtain the dilute solution

Question 49:

• WAEC 2020

Calcium chloride is an ionic compound. Which of the following statements account for its ionic character?
I. Calcium has high ionization energy. II. Calcium has low ionization energy. III. Chlorine has high electron affinity. IV. Chlorine has high Ionization energy.

A. I and Il only
B. I, II and IV only
C. II, IIl and IV only
D. I, II, III and IV

Question 50:

• WAEC 2020

An example of a biodegradable pollutant is?

A. Plastic
B. Sewage
C. Carbon (II) oxide
D. Hydrogen sulphide