Waec Chemistry 1998 Past Questions and Answers

Question 1:

• WAEC 1998

AN AQUEOUS SOLUTION IS ACIDIC IF

A. Its pH value is high
B. It s corrosive
C. It changes the colour of litmus
D. It has a bitter taste
E. It contains more H₃O- than OH-

Question 2:

• WAEC 1998

AN AQUEOUS SOLUTION IS ACIDIC IF

A. Its pH value is high
B. It s corrosive
C. It changes the colour of litmus
D. It has a bitter taste
E. It contains more H₃O- than OH-

Question 3:

• WAEC 1998

The following oxides react with water except

A. Na₂O
B. SO₃
C. NO₂
D. CO₂
E. CuO

Question 4:

• WAEC 1998

Which of the following is not a property of trioxonitrate (V) salts?

A. Positive reaction to the brown ring test
B. Ability to dissolve in cold water
C. Decomposition on being strongly heated
D. Production of effervescence with saturated Na₂CO₃ solution
E. Evolution of gas with concentrated H₂SO₄ and copper turnings

Question 5:

• WAEC 1998

Which of the following methods is suitable for the preparation of an insoluble salt?

A. Action of an acid on a metal
B. Double decomposition
C. Neutralisation
D. Action of an acid on a trioxocarbonate (IV)
E. Action of an acid on an oxide