Waec Chemistry 2019 Past Questions and Answers

Question 11:

• WAEC 2019

Which of the substances is non-polar?

A. Bromine
B. Ammonia
C. Water
D. Hydrogen Bromide

Question 12:

• WAEC 2019

Which of the following pairs of components have the same molecular mass?
[ H = 1.0, C = 12.0, O = 16.0 ]

A. Ethene and Ethyne
B. Ethane and Ethene
C. Carbon (ii) Oxide and Ethene
D. Carbon (iv) Oxide and Ethyne

Question 13:

• WAEC 2019

When an equilibrium is established between dissolved and undissolved solutes, the solution is said to be?

A. Saturated
B. Unsaturated
C. Concentrated
D. Diluted

Question 14:

• WAEC 2019

How many moles of carbon(iv)oxide contains 16.0g of oxygen?
[ C = 12.0, O = 16.0 ]

A. 0.20 mol
B. 0.25 mol
C. 0.40 mol
D. 0.50 mol

Question 15:

• WAEC 2019

Stoichiometry is based on the law?

A. Multiple proportion
B. Constant composition
C. Conservation of energy
D. Conservation of mass