Which source of water needs the least treatment to make it potable?
Ground water collected from an aquifer below farmland
Waste water collected from the drains of a large town
Sea water pumped from the coast to a treatment works
Water collected from a pond beside an industrial site
40 exam-style questions on AQA GCSE Chemistry 10.1 Using the Earth's resources and obtaining potable water, covering 10.1.1 Using the Earth's resources and sustainable development, 10.1.2 Potable water, 10.1.3 Waste water treatment, and 10.1.4 Alternative methods of extracting metals. Each one has a worked solution and a mark scheme showing where the marks go.