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CAIE IGCSE Chemistry Sedimentation Filtration Carbon and Chlorination

CAIE IGCSE Chemistry Sedimentation Filtration Carbon and Chlorination
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise ordering domestic water-treatment stages and matching sedimentation, filtration, activated carbon and chlorination to the impurity removed.

How this is tested

  • use sedimentation and filtration to remove suspended insoluble solid particles
  • use activated carbon to remove unwanted tastes, odours and some dissolved substances
  • use chlorination to kill harmful microbes rather than to remove dissolved salts

Question 27

[Maximum number: 1]

Which statements about the treatment of domestic water supplies are correct?

1 Filtration is used to remove insoluble substances from the water.
2 Sedimentation is used to remove soluble substances from the water.
3 Carbon is used to remove tastes and odours from the water.
4 Chlorine is used to lower the pH of the water.

A

1 and 3

B

1 and 4

C

2 and 3

D

2 and 4