Waec Chemistry 2000 Past Questions and Answers

Question 16:

• WAEC 2000

The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is

A. Hydrogen
B. Oxygen
C. Carbon (IV) oxide
D. Sulphur (VI) oxide

Question 17:

• WAEC 2000

If a solution has a pH of 2, it can be concluded that it

A. Is a weak electrolyte
B. Has hyrogen ion concentration of 0.2 mol sm^-3
C. Is twice as acidic as a solution of pH 1,
D. Will produce effervescence with magnesium ribbon

Question 18:

• WAEC 2000

Which of the following salts is stable to heat?

A. K₂CO₃
B. (NH₄)₂SO₄
C. NaHCO ₃
D. AgNO₃

Question 19:

• WAEC 2000

Which of the following compounds dissolves in water to give an alkaline solution?

A. Ammonium chloride
B. Sodium chloride
C. Sulphur (IV) oxide
D. Potassium oxide

Question 20:

• WAEC 2000

Which of the following salts is stable to heat?

A. K ₂CO ₃
B. (NH ₄) ₂SO ₄
C. NaHCO₃
D. AgNO₃