Waec Chemistry Past Questions For Year 1996
Question 31
During water treatment for town supply, water is passed through layers of send beds in order to
- A. soften the water
- B. filter the water
- C. decolorize the water
- D. destroy the germs in the water
- E. coagulate colloidal particles in the water
Question 32
The following salts will produce a gas on reacting with hydrochloric acid except
- A. CuSO4
- B. CaCO3
- C. FeS
- D. Na2SO3
- E. K2CO3
Question 33
The following are properties of transition metals except
- A. variable oxidation states
- B. tendency to form complext ions
- C. formation of coloured ions
- D. ability to act as catalyst
- E. low melting points
Question 34
The products formed when sodium hydrogen trioxocarbonate (IV) is heated strongly are
- A. carbon (IV) oxide and sodium hydride
- B. carbon (IV) oxide and soudium trioxocarbonate (IV)
- C. sodium trioxocarbonate (IV) and steam
- D. carbon (IV) oxide and steam
- E. sodium trioxocarbonate (IV) carbon (IV) oxide and steam
Question 35
What amount of copper is deposited when 13.0g of zinc reacts with excess copper (ll) tetraoxosulphate (IV) solution according to the following equation? Zn (s) + CuSO4(aq) → ZnSO4(aq) + Cu (s) [Cu =63,5, Zn = 65]
- A. 0.1 mole
- B. 0.2mole
- C. 0.3 mole
- D. 0.4 mole
- E. 0.5 mole
