O-LevelChemistryChemistry of the Environment5070/12 · Oct/Nov 2020 · Q331 Mark
Four processes are used during the purification of water. • use of carbon • desalination • chlorination • filtration The purposes, W, X, Y and Z, for these processes are listed. W disinfection X removal of solids Y removal of dissolved salts Z removal of tastes and odours What is the purpose for each process?
Ause of carbon: Y, desalination: Z, chlorination: W, filtration: X
Buse of carbon: Z, desalination: Y, chlorination: W, filtration: X
Cuse of carbon: Z, desalination: Y, chlorination: X, filtration: W
Duse of carbon: Y, desalination: Z, chlorination: X, filtration: W
✓ Correct answer
B: use of carbon: Z, desalination: Y, chlorination: W, filtration: X
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