A railway depot stores fresh water in tanks before it is supplied as drinking water on trains. A technician compares ozone treatment, ultraviolet treatment, sand filtration and reverse osmosis.
Which statement correctly describes one of these methods?
Sand filtration removes dissolved salts from the water.
Ozone is added to the water to kill harmful microbes.
Ultraviolet light removes suspended insoluble particles.
Reverse osmosis adds a chemical that kills harmful microbes.
87 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.