Waec Chemistry 2020 Past Questions and Answers

Question 16:

• WAEC 2020

Which of the following pairs of elements has the greatest difference in electronegativity?

A. Na and F
B. Na and CI
C. Na and Br
D. Na and I

Question 17:

• WAEC 2020

A factor that is considered most important when siting a chemical industry is?

A. Nearness to other industrial establishments
B. Nearness to raw materials
C. Favourable climate conditions
D. Availability of storage facilities

Question 18:

• WAEC 2020

The boiling point of pentane is higher than that of propane because?

A. Carbon-carbon single bonds are stronger than carbon-hydrogen bonds.
B. Pentane has more covalent bonds to break
C. Pentane does not burn easily as
propane
D. The intermolecular forces in pentane are stronger than those of propane

Question 19:

• WAEC 2020

Which of the following solids would not decompose on heating?

A. Ammonium chloride
B. Lead (i) trioxonitrate (V)
C. Potassium trioxocarbonate (IV)
D. Sodium hydrogen trioxocarbonate (IV)

Question 20:

• WAEC 2020

The following molecules have double covalent bonds between two atoms except?

A. Oxygen
B. Carbon (IV)oxide
C. Ethene
D. Water