(a(i))[1]
Name one substance in river water that may be harmful. Explain why this substance may be harmful.
(a(ii))[1]
Name one substance in river water that is beneficial. Explain why this substance is beneficial.
(b)[3]
Describe the three processes involved in the treatment of water for the domestic water supply. State the reason why each process is used.
(c)[1]
Describe a qualitative chemical test to show the presence of water, including the observation.
(d)[1]
Explain how the purity of water is tested by measuring its boiling point.