What term is used to describe water that is safe for humans to drink?
Potable
Clear
Colourless
Which of the following could be harmful for humans if consumed in drinking water?
Carbon dioxide
Dissolved salts
Oxygen
Which solute is present in the highest quantity in sea water?
Sodium chloride
Sodium carbonate
Sodium hydrogencarbonate
Which of the following substances is removed by filtration?
Insoluble particles
Microbes
What is the name of the process that kills microbes during water purification?
Sterilisation
Precipitation
Crystallisation
Which of the following is not a method used to kill microbes during water purification in the UK?
Chlorine
Boiling
UV light
Which process is used to make drinking water from sea water?
Filtration
Chlorination
Desalination
Which process uses high pressure and a porous membrane to purify water?
Distillation
Reverse osmosis
Which of these is most likely to be a pollutant in agricultural waste water?
Fertiliser
Lead compounds
What is the name of the process used to purify water which involves boiling the water and then cooling it to condense the vapour?
Chromatography