Waec Chemistry Past Questions For Year 2004
Question 41
The process of seeding during the extraction of aluminium involves the addition of pure AI(OH)3 crystals in order to
- A. lower the temperature
- B. increase the concentration
- C. facilitate the precipitation of solid
- D. reduce the viscosity of the solution
Question 42
Which of the following pollutants is biodegradable?
- A. Domestic sewage
- B. Metal scraps
- C. Radioactive waste
- D. Plastic foil
