Waec Chemistry Past Questions For Year 1995
Question 21
The gas produced when a mixture of sodium propanoate and soda lime is heated is
- A. methane
- B. pentane
- C. ethane
- D. butene
- E. ethyne
Question 22
Fructose and glucose are classified as carbohydrates because they
- A. are crystalline white solids
- B. are energy -giving substances
- C. are naturally occurring organic compounds
- D. contain carbon oxygen and hydrogen
- E. conform to the general formula Cx(H2O)y
Question 23
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) → ZnCI2(aq) + H2(g)
- A. 0.1 mole
- B. 0.2mole
- C. 0.3 mole
- D. 1.0 mole
- E. 2.9 moles
Question 24
The following salts dissolve readily in cold water except
- A. CaCI2
- B. PbSO4
- C. (NH4)2SO4
- D. Na2CO3
- E. Na2SO3
Question 25
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
