Waec Chemistry 2015 Past Questions and Answers

Question 31:

• WAEC 2015

Which of the following oxides can be reduced by hydrogen?

A. Aluminium oxide
B. Magnesium oxide
C. Sodium oxide
D. Silver oxide

Question 32:

• WAEC 2015

Solubility is practically applied in

A. Fractional distillation
B. The determination of pH
C. The determination of saturation in hydrocarbons
D. Solvent extraction

Question 33:

• WAEC 2015

Which of the following compounds is the least soluble in water?

A. CaCl₂
B. CaSO₄
C. NaCl
D. Na₂SO₄

Question 34:

• WAEC 2015

A substance which dissolves readily in organic solvent would

A. Be a covalent compound
B. Have strong electrostatic forces of attraction
C. Have a high melting point
D. Conduct electricity in molten state

Question 35:

• WAEC 2015

A change in the temperature of a saturated solution disturbs the equilibrium between the

A. Undissolved solute and the solvent
B. Dissolved solute and the solvent
C. Dissolved solute and the undissolved solute
D. Dissolved solute and the solution