Waec Chemistry 1995 Past Questions and Answers

Question 26:

• WAEC 1995

Metals which react with steam only when they are red-hot include

A. Copper
B. Sodium
C. Calcium
D. Gold
E. Iron

Question 27:

• WAEC 1995

Copper (ll) tetraoxosulphate (VI) is often added to swimming pools because it

A. Prevents the growth of algae
B. Coagulates suspended particles
C. Neutralizes dissolved gases in water
D. Reacts with any excess chlorine present
E. Increases the amount of dissolved oxygen

Question 28:

• WAEC 1995

The following salts dissolve readily in cold water except

A. CaCI₂
B. PbSO₄
C. (NH₄)₂SO₄
D. Na₂CO₃
E. Na₂SO₃

Question 29:

• WAEC 1995

What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn_(s) + 2HCI_(aq) → ZnCI_2(aq) + H_2(g)

A. 0.1 mole
B. 0.2mole
C. 0.3 mole
D. 1.0 mole
E. 2.9 moles

Question 30:

• WAEC 1995

What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn_(s) + 2HCI_(aq) → ZnCI_2(aq) + H_2(g)

A. 0.1 mole
B. 0.2mole
C. 0.3 mole
D. 1.0 mole
E. 2.9 moles